Pasting relevant dmesg crash output from the apport-bug file here:

 [102164.197484] ------------[ cut here ]------------
 [102164.197530] WARNING: at 
/build/buildd/linux-3.2.0/drivers/gpu/drm/i915/i915_drv.c:413 
__gen6_gt_wait_for_fifo+0x94/0xa0 [i915]()
 [102164.197537] Hardware name: 4294CTO
 [102164.197541] Modules linked in: parport_pc ppdev usbhid hid ip6table_filter 
ip6_tables ebtable_nat ebtables xt_state ipt_REJECT xt_CHECKSUM iptable_mangle 
xt_tcpudp iptable_filter snd_hda_codec_hdmi snd_hda_codec_conexant joydev 
ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 nf_conntrack nf_defrag_ipv4 
ip_tables x_tables bridge kvm_intel stp kvm rfcomm bnep binfmt_misc arc4 
snd_hda_intel snd_hda_codec snd_hwdep snd_pcm snd_seq_midi snd_rawmidi psmouse 
serio_raw thinkpad_acpi nvram snd_seq_midi_event tpm_tis wmi mac_hid wacom 
snd_seq iwlwifi mac80211 snd_timer snd_seq_device btusb mei(C) bluetooth 
cfg80211 i915 snd drm_kms_helper drm soundcore snd_page_alloc i2c_algo_bit 
video coretemp lp parport e1000e sdhci_pci sdhci btrfs zlib_deflate libcrc32c
 [102164.197653] Pid: 19024, comm: Xorg Tainted: G         C   3.2.0-20-generic 
#33-Ubuntu
 [102164.197658] Call Trace:
 [102164.197675]  [<ffffffff8106726f>] warn_slowpath_common+0x7f/0xc0
 [102164.197683]  [<ffffffff810672ca>] warn_slowpath_null+0x1a/0x20
 [102164.197704]  [<ffffffffa01939d4>] __gen6_gt_wait_for_fifo+0x94/0xa0 [i915]
 [102164.197725]  [<ffffffffa0194055>] i915_write32+0xe5/0xf0 [i915]
 [102164.197761]  [<ffffffffa01d0241>] ring_write_tail+0x21/0x30 [i915]
 [102164.197793]  [<ffffffffa01d29c6>] gen6_render_ring_flush+0xd6/0xf0 [i915]
 [102164.197818]  [<ffffffffa01a555e>] i915_gem_flush_ring.part.26+0x3e/0xd0 
[i915]
 [102164.197841]  [<ffffffffa01a5f99>] i915_gem_flush_ring+0x19/0x20 [i915]
 [102164.197866]  [<ffffffffa01aaf60>] 
i915_gem_execbuffer_move_to_gpu+0x1b0/0x200 [i915]
 [102164.197890]  [<ffffffffa01ab64b>] 
i915_gem_do_execbuffer.isra.8+0x69b/0x940 [i915]
 [102164.197902]  [<ffffffff8108f02b>] ? __hrtimer_start_range_ns+0x16b/0x3a0
 [102164.197926]  [<ffffffffa01abdb3>] i915_gem_execbuffer2+0xa3/0x270 [i915]
 [102164.197950]  [<ffffffffa01295d4>] drm_ioctl+0x444/0x510 [drm]
 [102164.197974]  [<ffffffffa01abd10>] ? i915_gem_execbuffer+0x420/0x420 [i915]
 [102164.197984]  [<ffffffff8101dbf4>] ? restore_user_xstate+0x54/0xa0
 [102164.197993]  [<ffffffff81189d2a>] do_vfs_ioctl+0x8a/0x340
 [102164.198001]  [<ffffffff8118a071>] sys_ioctl+0x91/0xa0
 [102164.198010]  [<ffffffff81664502>] system_call_fastpath+0x16/0x1b
 [102164.198016] ---[ end trace dd6b4ef05c93f21a ]---
 [102164.203168] ------------[ cut here ]------------
 [102164.203188] WARNING: at 
/build/buildd/linux-3.2.0/drivers/gpu/drm/i915/i915_drv.c:413 
__gen6_gt_wait_for_fifo+0x94/0xa0 [i915]()
 [102164.203194] Hardware name: 4294CTO
 [102164.203197] Modules linked in: parport_pc ppdev usbhid hid ip6table_filter 
ip6_tables ebtable_nat ebtables xt_state ipt_REJECT xt_CHECKSUM iptable_mangle 
xt_tcpudp iptable_filter snd_hda_codec_hdmi snd_hda_codec_conexant joydev 
ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 nf_conntrack nf_defrag_ipv4 
ip_tables x_tables bridge kvm_intel stp kvm rfcomm bnep binfmt_misc arc4 
snd_hda_intel snd_hda_codec snd_hwdep snd_pcm snd_seq_midi snd_rawmidi psmouse 
serio_raw thinkpad_acpi nvram snd_seq_midi_event tpm_tis wmi mac_hid wacom 
snd_seq iwlwifi mac80211 snd_timer snd_seq_device btusb mei(C) bluetooth 
cfg80211 i915 snd drm_kms_helper drm soundcore snd_page_alloc i2c_algo_bit 
video coretemp lp parport e1000e sdhci_pci sdhci btrfs zlib_deflate libcrc32c
 [102164.203298] Pid: 19024, comm: Xorg Tainted: G        WC   3.2.0-20-generic 
#33-Ubuntu
 [102164.203302] Call Trace:
 [102164.203311]  [<ffffffff8106726f>] warn_slowpath_common+0x7f/0xc0
 [102164.203319]  [<ffffffff810672ca>] warn_slowpath_null+0x1a/0x20
 [102164.203338]  [<ffffffffa01939d4>] __gen6_gt_wait_for_fifo+0x94/0xa0 [i915]
 [102164.203358]  [<ffffffffa0194055>] i915_write32+0xe5/0xf0 [i915]
 [102164.203388]  [<ffffffffa01d0be2>] gen6_ring_get_irq+0xb2/0xd0 [i915]
 [102164.203414]  [<ffffffffa01d0c18>] blt_ring_get_irq+0x18/0x20 [i915]
 [102164.203437]  [<ffffffffa01a5b63>] i915_wait_request+0x183/0x560 [i915]
 [102164.203463]  [<ffffffffa01d0241>] ? ring_write_tail+0x21/0x30 [i915]
 [102164.203488]  [<ffffffffa01d29c6>] ? gen6_render_ring_flush+0xd6/0xf0 [i915]
 [102164.203511]  [<ffffffffa01a5f72>] i915_gem_object_wait_rendering+0x32/0x40 
[i915]
 [102164.203534]  [<ffffffffa01aad2d>] 
i915_gem_execbuffer_sync_rings+0xdd/0x160 [i915]
 [102164.203556]  [<ffffffffa01aaf1e>] 
i915_gem_execbuffer_move_to_gpu+0x16e/0x200 [i915]
 [102164.203578]  [<ffffffffa01ab64b>] 
i915_gem_do_execbuffer.isra.8+0x69b/0x940 [i915]
 [102164.203588]  [<ffffffff8108f02b>] ? __hrtimer_start_range_ns+0x16b/0x3a0
 [102164.203610]  [<ffffffffa01abdb3>] i915_gem_execbuffer2+0xa3/0x270 [i915]
 [102164.203631]  [<ffffffffa01295d4>] drm_ioctl+0x444/0x510 [drm]
 [102164.203655]  [<ffffffffa01abd10>] ? i915_gem_execbuffer+0x420/0x420 [i915]
 [102164.203664]  [<ffffffff8101dbf4>] ? restore_user_xstate+0x54/0xa0
 [102164.203672]  [<ffffffff81189d2a>] do_vfs_ioctl+0x8a/0x340
 [102164.203680]  [<ffffffff8118a071>] sys_ioctl+0x91/0xa0
 [102164.203687]  [<ffffffff81664502>] system_call_fastpath+0x16/0x1b
 [102164.203692] ---[ end trace dd6b4ef05c93f21b ]---
 [102164.217406] ------------[ cut here ]------------
 [102164.217437] WARNING: at 
/build/buildd/linux-3.2.0/drivers/gpu/drm/i915/i915_drv.c:413 
__gen6_gt_wait_for_fifo+0x94/0xa0 [i915]()
 [102164.217444] Hardware name: 4294CTO
 [102164.217448] Modules linked in: parport_pc ppdev usbhid hid ip6table_filter 
ip6_tables ebtable_nat ebtables xt_state ipt_REJECT xt_CHECKSUM iptable_mangle 
xt_tcpudp iptable_filter snd_hda_codec_hdmi snd_hda_codec_conexant joydev 
ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 nf_conntrack nf_defrag_ipv4 
ip_tables x_tables bridge kvm_intel stp kvm rfcomm bnep binfmt_misc arc4 
snd_hda_intel snd_hda_codec snd_hwdep snd_pcm snd_seq_midi snd_rawmidi psmouse 
serio_raw thinkpad_acpi nvram snd_seq_midi_event tpm_tis wmi mac_hid wacom 
snd_seq iwlwifi mac80211 snd_timer snd_seq_device btusb mei(C) bluetooth 
cfg80211 i915 snd drm_kms_helper drm soundcore snd_page_alloc i2c_algo_bit 
video coretemp lp parport e1000e sdhci_pci sdhci btrfs zlib_deflate libcrc32c
 [102164.217554] Pid: 19024, comm: Xorg Tainted: G        WC   3.2.0-20-generic 
#33-Ubuntu
 [102164.217559] Call Trace:
 [102164.217572]  [<ffffffff8106726f>] warn_slowpath_common+0x7f/0xc0
 [102164.217580]  [<ffffffff810672ca>] warn_slowpath_null+0x1a/0x20
 [102164.217600]  [<ffffffffa01939d4>] __gen6_gt_wait_for_fifo+0x94/0xa0 [i915]
 [102164.217621]  [<ffffffffa0194055>] i915_write32+0xe5/0xf0 [i915]
 [102164.217657]  [<ffffffffa01d0682>] gen6_ring_put_irq+0xa2/0xc0 [i915]
 [102164.217687]  [<ffffffffa01d06b8>] blt_ring_put_irq+0x18/0x20 [i915]
 [102164.217713]  [<ffffffffa01a5b97>] i915_wait_request+0x1b7/0x560 [i915]
 [102164.217722]  [<ffffffff8108aef0>] ? add_wait_queue+0x60/0x60
 [102164.217745]  [<ffffffffa01a5f72>] i915_gem_object_wait_rendering+0x32/0x40 
[i915]
 [102164.217770]  [<ffffffffa01aad2d>] 
i915_gem_execbuffer_sync_rings+0xdd/0x160 [i915]
 [102164.217793]  [<ffffffffa01aaf1e>] 
i915_gem_execbuffer_move_to_gpu+0x16e/0x200 [i915]
 [102164.217816]  [<ffffffffa01ab64b>] 
i915_gem_do_execbuffer.isra.8+0x69b/0x940 [i915]
 [102164.217826]  [<ffffffff8108f02b>] ? __hrtimer_start_range_ns+0x16b/0x3a0
 [102164.217849]  [<ffffffffa01abdb3>] i915_gem_execbuffer2+0xa3/0x270 [i915]
 [102164.217870]  [<ffffffffa01295d4>] drm_ioctl+0x444/0x510 [drm]
 [102164.217894]  [<ffffffffa01abd10>] ? i915_gem_execbuffer+0x420/0x420 [i915]
 [102164.217903]  [<ffffffff8101dbf4>] ? restore_user_xstate+0x54/0xa0
 [102164.217912]  [<ffffffff81189d2a>] do_vfs_ioctl+0x8a/0x340
 [102164.217920]  [<ffffffff8118a071>] sys_ioctl+0x91/0xa0
 [102164.217928]  [<ffffffff81664502>] system_call_fastpath+0x16/0x1b
 [102164.217933] ---[ end trace dd6b4ef05c93f21c ]---
 [102164.223145] ------------[ cut here ]------------
 [102164.223166] WARNING: at 
/build/buildd/linux-3.2.0/drivers/gpu/drm/i915/i915_drv.c:413 
__gen6_gt_wait_for_fifo+0x94/0xa0 [i915]()
 [102164.223172] Hardware name: 4294CTO
 [102164.223175] Modules linked in: parport_pc ppdev usbhid hid ip6table_filter 
ip6_tables ebtable_nat ebtables xt_state ipt_REJECT xt_CHECKSUM iptable_mangle 
xt_tcpudp iptable_filter snd_hda_codec_hdmi snd_hda_codec_conexant joydev 
ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 nf_conntrack nf_defrag_ipv4 
ip_tables x_tables bridge kvm_intel stp kvm rfcomm bnep binfmt_misc arc4 
snd_hda_intel snd_hda_codec snd_hwdep snd_pcm snd_seq_midi snd_rawmidi psmouse 
serio_raw thinkpad_acpi nvram snd_seq_midi_event tpm_tis wmi mac_hid wacom 
snd_seq iwlwifi mac80211 snd_timer snd_seq_device btusb mei(C) bluetooth 
cfg80211 i915 snd drm_kms_helper drm soundcore snd_page_alloc i2c_algo_bit 
video coretemp lp parport e1000e sdhci_pci sdhci btrfs zlib_deflate libcrc32c
 [102164.223276] Pid: 19024, comm: Xorg Tainted: G        WC   3.2.0-20-generic 
#33-Ubuntu
 [102164.223281] Call Trace:
 [102164.223291]  [<ffffffff8106726f>] warn_slowpath_common+0x7f/0xc0
 [102164.223298]  [<ffffffff810672ca>] warn_slowpath_null+0x1a/0x20
 [102164.223317]  [<ffffffffa01939d4>] __gen6_gt_wait_for_fifo+0x94/0xa0 [i915]
 [102164.223338]  [<ffffffffa0194055>] i915_write32+0xe5/0xf0 [i915]
 [102164.223368]  [<ffffffffa01d0241>] ring_write_tail+0x21/0x30 [i915]
 [102164.223395]  [<ffffffffa01d2833>] 
intel_emit_post_sync_nonzero_flush+0xd3/0x190 [i915]
 [102164.223421]  [<ffffffffa01d2913>] gen6_render_ring_flush+0x23/0xf0 [i915]
 [102164.223430]  [<ffffffff810307c8>] ? native_smp_send_reschedule+0x48/0x60
 [102164.223454]  [<ffffffffa01a555e>] i915_gem_flush_ring.part.26+0x3e/0xd0 
[i915]
 [102164.223476]  [<ffffffffa01a5f99>] i915_gem_flush_ring+0x19/0x20 [i915]
 [102164.223498]  [<ffffffffa01aaf60>] 
i915_gem_execbuffer_move_to_gpu+0x1b0/0x200 [i915]
 [102164.223521]  [<ffffffffa01ab64b>] 
i915_gem_do_execbuffer.isra.8+0x69b/0x940 [i915]
 [102164.223531]  [<ffffffff8108f02b>] ? __hrtimer_start_range_ns+0x16b/0x3a0
 [102164.223553]  [<ffffffffa01abdb3>] i915_gem_execbuffer2+0xa3/0x270 [i915]
 [102164.223575]  [<ffffffffa01295d4>] drm_ioctl+0x444/0x510 [drm]
 [102164.223598]  [<ffffffffa01abd10>] ? i915_gem_execbuffer+0x420/0x420 [i915]
 [102164.223607]  [<ffffffff8101dbf4>] ? restore_user_xstate+0x54/0xa0
 [102164.223616]  [<ffffffff81189d2a>] do_vfs_ioctl+0x8a/0x340
 [102164.223623]  [<ffffffff8118a071>] sys_ioctl+0x91/0xa0
 [102164.223631]  [<ffffffff81664502>] system_call_fastpath+0x16/0x1b
 [102164.223636] ---[ end trace dd6b4ef05c93f21d ]---
 [102164.228794] ------------[ cut here ]------------
 [102164.228818] WARNING: at 
/build/buildd/linux-3.2.0/drivers/gpu/drm/i915/i915_drv.c:413 
__gen6_gt_wait_for_fifo+0x94/0xa0 [i915]()
 [102164.228824] Hardware name: 4294CTO
 [102164.228827] Modules linked in: parport_pc ppdev usbhid hid ip6table_filter 
ip6_tables ebtable_nat ebtables xt_state ipt_REJECT xt_CHECKSUM iptable_mangle 
xt_tcpudp iptable_filter snd_hda_codec_hdmi snd_hda_codec_conexant joydev 
ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 nf_conntrack nf_defrag_ipv4 
ip_tables x_tables bridge kvm_intel stp kvm rfcomm bnep binfmt_misc arc4 
snd_hda_intel snd_hda_codec snd_hwdep snd_pcm snd_seq_midi snd_rawmidi psmouse 
serio_raw thinkpad_acpi nvram snd_seq_midi_event tpm_tis wmi mac_hid wacom 
snd_seq iwlwifi mac80211 snd_timer snd_seq_device btusb mei(C) bluetooth 
cfg80211 i915 snd drm_kms_helper drm soundcore snd_page_alloc i2c_algo_bit 
video coretemp lp parport e1000e sdhci_pci sdhci btrfs zlib_deflate libcrc32c
 [102164.228928] Pid: 19024, comm: Xorg Tainted: G        WC   3.2.0-20-generic 
#33-Ubuntu
 [102164.228933] Call Trace:
 [102164.228943]  [<ffffffff8106726f>] warn_slowpath_common+0x7f/0xc0
 [102164.228950]  [<ffffffff810672ca>] warn_slowpath_null+0x1a/0x20
 [102164.228969]  [<ffffffffa01939d4>] __gen6_gt_wait_for_fifo+0x94/0xa0 [i915]
 [102164.228990]  [<ffffffffa0194055>] i915_write32+0xe5/0xf0 [i915]
 [102164.229017]  [<ffffffffa01d0241>] ring_write_tail+0x21/0x30 [i915]
 [102164.229042]  [<ffffffffa01d28de>] 
intel_emit_post_sync_nonzero_flush+0x17e/0x190 [i915]
 [102164.229067]  [<ffffffffa01d2913>] gen6_render_ring_flush+0x23/0xf0 [i915]
 [102164.229075]  [<ffffffff810307c8>] ? native_smp_send_reschedule+0x48/0x60
 [102164.229098]  [<ffffffffa01a555e>] i915_gem_flush_ring.part.26+0x3e/0xd0 
[i915]
 [102164.229121]  [<ffffffffa01a5f99>] i915_gem_flush_ring+0x19/0x20 [i915]
 [102164.229143]  [<ffffffffa01aaf60>] 
i915_gem_execbuffer_move_to_gpu+0x1b0/0x200 [i915]
 [102164.229165]  [<ffffffffa01ab64b>] 
i915_gem_do_execbuffer.isra.8+0x69b/0x940 [i915]
 [102164.229175]  [<ffffffff8108f02b>] ? __hrtimer_start_range_ns+0x16b/0x3a0
 [102164.229197]  [<ffffffffa01abdb3>] i915_gem_execbuffer2+0xa3/0x270 [i915]
 [102164.229218]  [<ffffffffa01295d4>] drm_ioctl+0x444/0x510 [drm]
 [102164.229241]  [<ffffffffa01abd10>] ? i915_gem_execbuffer+0x420/0x420 [i915]
 [102164.229250]  [<ffffffff8101dbf4>] ? restore_user_xstate+0x54/0xa0
 [102164.229259]  [<ffffffff81189d2a>] do_vfs_ioctl+0x8a/0x340
 [102164.229266]  [<ffffffff8118a071>] sys_ioctl+0x91/0xa0
 [102164.229274]  [<ffffffff81664502>] system_call_fastpath+0x16/0x1b
 [102164.229279] ---[ end trace dd6b4ef05c93f21e ]---
 [102164.234434] ------------[ cut here ]------------
 [102164.234454] WARNING: at 
/build/buildd/linux-3.2.0/drivers/gpu/drm/i915/i915_drv.c:413 
__gen6_gt_wait_for_fifo+0x94/0xa0 [i915]()
 [102164.234459] Hardware name: 4294CTO
 [102164.234462] Modules linked in: parport_pc ppdev usbhid hid ip6table_filter 
ip6_tables ebtable_nat ebtables xt_state ipt_REJECT xt_CHECKSUM iptable_mangle 
xt_tcpudp iptable_filter snd_hda_codec_hdmi snd_hda_codec_conexant joydev 
ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 nf_conntrack nf_defrag_ipv4 
ip_tables x_tables bridge kvm_intel stp kvm rfcomm bnep binfmt_misc arc4 
snd_hda_intel snd_hda_codec snd_hwdep snd_pcm snd_seq_midi snd_rawmidi psmouse 
serio_raw thinkpad_acpi nvram snd_seq_midi_event tpm_tis wmi mac_hid wacom 
snd_seq iwlwifi mac80211 snd_timer snd_seq_device btusb mei(C) bluetooth 
cfg80211 i915 snd drm_kms_helper drm soundcore snd_page_alloc i2c_algo_bit 
video coretemp lp parport e1000e sdhci_pci sdhci btrfs zlib_deflate libcrc32c
 [102164.234561] Pid: 19024, comm: Xorg Tainted: G        WC   3.2.0-20-generic 
#33-Ubuntu
 [102164.234566] Call Trace:
 [102164.234574]  [<ffffffff8106726f>] warn_slowpath_common+0x7f/0xc0
 [102164.234582]  [<ffffffff810672ca>] warn_slowpath_null+0x1a/0x20
 [102164.234601]  [<ffffffffa01939d4>] __gen6_gt_wait_for_fifo+0x94/0xa0 [i915]
 [102164.234622]  [<ffffffffa0194055>] i915_write32+0xe5/0xf0 [i915]
 [102164.234647]  [<ffffffffa01d0241>] ring_write_tail+0x21/0x30 [i915]
 [102164.234671]  [<ffffffffa01d29c6>] gen6_render_ring_flush+0xd6/0xf0 [i915]
 [102164.234694]  [<ffffffffa01a555e>] i915_gem_flush_ring.part.26+0x3e/0xd0 
[i915]
 [102164.234716]  [<ffffffffa01a5f99>] i915_gem_flush_ring+0x19/0x20 [i915]
 [102164.234738]  [<ffffffffa01aaf60>] 
i915_gem_execbuffer_move_to_gpu+0x1b0/0x200 [i915]
 [102164.234761]  [<ffffffffa01ab64b>] 
i915_gem_do_execbuffer.isra.8+0x69b/0x940 [i915]
 [102164.234770]  [<ffffffff8108f02b>] ? __hrtimer_start_range_ns+0x16b/0x3a0
 [102164.234793]  [<ffffffffa01abdb3>] i915_gem_execbuffer2+0xa3/0x270 [i915]
 [102164.234814]  [<ffffffffa01295d4>] drm_ioctl+0x444/0x510 [drm]
 [102164.234837]  [<ffffffffa01abd10>] ? i915_gem_execbuffer+0x420/0x420 [i915]
 [102164.234846]  [<ffffffff8101dbf4>] ? restore_user_xstate+0x54/0xa0
 [102164.234854]  [<ffffffff81189d2a>] do_vfs_ioctl+0x8a/0x340
 [102164.234862]  [<ffffffff8118a071>] sys_ioctl+0x91/0xa0
 [102164.234869]  [<ffffffff81664502>] system_call_fastpath+0x16/0x1b
 [102164.234874] ---[ end trace dd6b4ef05c93f21f ]---
 [102164.240027] ------------[ cut here ]------------
 [102164.240050] WARNING: at 
/build/buildd/linux-3.2.0/drivers/gpu/drm/i915/i915_drv.c:413 
__gen6_gt_wait_for_fifo+0x94/0xa0 [i915]()
 [102164.240055] Hardware name: 4294CTO
 [102164.240058] Modules linked in: parport_pc ppdev usbhid hid ip6table_filter 
ip6_tables ebtable_nat ebtables xt_state ipt_REJECT xt_CHECKSUM iptable_mangle 
xt_tcpudp iptable_filter snd_hda_codec_hdmi snd_hda_codec_conexant joydev 
ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 nf_conntrack nf_defrag_ipv4 
ip_tables x_tables bridge kvm_intel stp kvm rfcomm bnep binfmt_misc arc4 
snd_hda_intel snd_hda_codec snd_hwdep snd_pcm snd_seq_midi snd_rawmidi psmouse 
serio_raw thinkpad_acpi nvram snd_seq_midi_event tpm_tis wmi mac_hid wacom 
snd_seq iwlwifi mac80211 snd_timer snd_seq_device btusb mei(C) bluetooth 
cfg80211 i915 snd drm_kms_helper drm soundcore snd_page_alloc i2c_algo_bit 
video coretemp lp parport e1000e sdhci_pci sdhci btrfs zlib_deflate libcrc32c
 [102164.240158] Pid: 19024, comm: Xorg Tainted: G        WC   3.2.0-20-generic 
#33-Ubuntu
 [102164.240162] Call Trace:
 [102164.240172]  [<ffffffff8106726f>] warn_slowpath_common+0x7f/0xc0
 [102164.240179]  [<ffffffff810672ca>] warn_slowpath_null+0x1a/0x20
 [102164.240198]  [<ffffffffa01939d4>] __gen6_gt_wait_for_fifo+0x94/0xa0 [i915]
 [102164.240218]  [<ffffffffa0194055>] i915_write32+0xe5/0xf0 [i915]
 [102164.240244]  [<ffffffffa01d0be2>] gen6_ring_get_irq+0xb2/0xd0 [i915]
 [102164.240268]  [<ffffffffa01d0c18>] blt_ring_get_irq+0x18/0x20 [i915]
 [102164.240291]  [<ffffffffa01a5b63>] i915_wait_request+0x183/0x560 [i915]
 [102164.240315]  [<ffffffffa01d0241>] ? ring_write_tail+0x21/0x30 [i915]
 [102164.240339]  [<ffffffffa01d29c6>] ? gen6_render_ring_flush+0xd6/0xf0 [i915]
 [102164.240362]  [<ffffffffa01a5f72>] i915_gem_object_wait_rendering+0x32/0x40 
[i915]
 [102164.240384]  [<ffffffffa01aad2d>] 
i915_gem_execbuffer_sync_rings+0xdd/0x160 [i915]
 [102164.240406]  [<ffffffffa01aaf1e>] 
i915_gem_execbuffer_move_to_gpu+0x16e/0x200 [i915]
 [102164.240428]  [<ffffffffa01ab64b>] 
i915_gem_do_execbuffer.isra.8+0x69b/0x940 [i915]
 [102164.240438]  [<ffffffff8108f02b>] ? __hrtimer_start_range_ns+0x16b/0x3a0
 [102164.240460]  [<ffffffffa01abdb3>] i915_gem_execbuffer2+0xa3/0x270 [i915]
 [102164.240481]  [<ffffffffa01295d4>] drm_ioctl+0x444/0x510 [drm]
 [102164.240504]  [<ffffffffa01abd10>] ? i915_gem_execbuffer+0x420/0x420 [i915]
 [102164.240513]  [<ffffffff8101dbf4>] ? restore_user_xstate+0x54/0xa0
 [102164.240522]  [<ffffffff81189d2a>] do_vfs_ioctl+0x8a/0x340
 [102164.240529]  [<ffffffff8118a071>] sys_ioctl+0x91/0xa0
 [102164.240537]  [<ffffffff81664502>] system_call_fastpath+0x16/0x1b
 [102164.240542] ---[ end trace dd6b4ef05c93f220 ]---
 [102164.245701] ------------[ cut here ]------------
 [102164.245726] WARNING: at 
/build/buildd/linux-3.2.0/drivers/gpu/drm/i915/i915_drv.c:413 
__gen6_gt_wait_for_fifo+0x94/0xa0 [i915]()
 [102164.245734] Hardware name: 4294CTO
 [102164.245738] Modules linked in: parport_pc ppdev usbhid hid ip6table_filter 
ip6_tables ebtable_nat ebtables xt_state ipt_REJECT xt_CHECKSUM iptable_mangle 
xt_tcpudp iptable_filter snd_hda_codec_hdmi snd_hda_codec_conexant joydev 
ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 nf_conntrack nf_defrag_ipv4 
ip_tables x_tables bridge kvm_intel stp kvm rfcomm bnep binfmt_misc arc4 
snd_hda_intel snd_hda_codec snd_hwdep snd_pcm snd_seq_midi snd_rawmidi psmouse 
serio_raw thinkpad_acpi nvram snd_seq_midi_event tpm_tis wmi mac_hid wacom 
snd_seq iwlwifi mac80211 snd_timer snd_seq_device btusb mei(C) bluetooth 
cfg80211 i915 snd drm_kms_helper drm soundcore snd_page_alloc i2c_algo_bit 
video coretemp lp parport e1000e sdhci_pci sdhci btrfs zlib_deflate libcrc32c
 [102164.245840] Pid: 19024, comm: Xorg Tainted: G        WC   3.2.0-20-generic 
#33-Ubuntu
 [102164.245844] Call Trace:
 [102164.245854]  [<ffffffff8106726f>] warn_slowpath_common+0x7f/0xc0
 [102164.245861]  [<ffffffff810672ca>] warn_slowpath_null+0x1a/0x20
 [102164.245879]  [<ffffffffa01939d4>] __gen6_gt_wait_for_fifo+0x94/0xa0 [i915]
 [102164.245900]  [<ffffffffa0194055>] i915_write32+0xe5/0xf0 [i915]
 [102164.245925]  [<ffffffffa01d0682>] gen6_ring_put_irq+0xa2/0xc0 [i915]
 [102164.245948]  [<ffffffffa01d06b8>] blt_ring_put_irq+0x18/0x20 [i915]
 [102164.245971]  [<ffffffffa01a5b97>] i915_wait_request+0x1b7/0x560 [i915]
 [102164.245979]  [<ffffffff8108aef0>] ? add_wait_queue+0x60/0x60
 [102164.246001]  [<ffffffffa01a5f72>] i915_gem_object_wait_rendering+0x32/0x40 
[i915]
 [102164.246022]  [<ffffffffa01aad2d>] 
i915_gem_execbuffer_sync_rings+0xdd/0x160 [i915]
 [102164.246044]  [<ffffffffa01aaf1e>] 
i915_gem_execbuffer_move_to_gpu+0x16e/0x200 [i915]
 [102164.246066]  [<ffffffffa01ab64b>] 
i915_gem_do_execbuffer.isra.8+0x69b/0x940 [i915]
 [102164.246075]  [<ffffffff8108f02b>] ? __hrtimer_start_range_ns+0x16b/0x3a0
 [102164.246097]  [<ffffffffa01abdb3>] i915_gem_execbuffer2+0xa3/0x270 [i915]
 [102164.246118]  [<ffffffffa01295d4>] drm_ioctl+0x444/0x510 [drm]
 [102164.246141]  [<ffffffffa01abd10>] ? i915_gem_execbuffer+0x420/0x420 [i915]
 [102164.246150]  [<ffffffff8101dbf4>] ? restore_user_xstate+0x54/0xa0
 [102164.246158]  [<ffffffff81189d2a>] do_vfs_ioctl+0x8a/0x340
 [102164.246166]  [<ffffffff8118a071>] sys_ioctl+0x91/0xa0
 [102164.246173]  [<ffffffff81664502>] system_call_fastpath+0x16/0x1b
 [102164.246178] ---[ end trace dd6b4ef05c93f221 ]---
 [102164.251274] ------------[ cut here ]------------
 [102164.251279] WARNING: at 
/build/buildd/linux-3.2.0/drivers/gpu/drm/i915/i915_drv.c:413 
__gen6_gt_wait_for_fifo+0x94/0xa0 [i915]()
 [102164.251281] Hardware name: 4294CTO
 [102164.251281] Modules linked in: parport_pc ppdev usbhid hid ip6table_filter 
ip6_tables ebtable_nat ebtables xt_state ipt_REJECT xt_CHECKSUM iptable_mangle 
xt_tcpudp iptable_filter snd_hda_codec_hdmi snd_hda_codec_conexant joydev 
ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 nf_conntrack nf_defrag_ipv4 
ip_tables x_tables bridge kvm_intel stp kvm rfcomm bnep binfmt_misc arc4 
snd_hda_intel snd_hda_codec snd_hwdep snd_pcm snd_seq_midi snd_rawmidi psmouse 
serio_raw thinkpad_acpi nvram snd_seq_midi_event tpm_tis wmi mac_hid wacom 
snd_seq iwlwifi mac80211 snd_timer snd_seq_device btusb mei(C) bluetooth 
cfg80211 i915 snd drm_kms_helper drm soundcore snd_page_alloc i2c_algo_bit 
video coretemp lp parport e1000e sdhci_pci sdhci btrfs zlib_deflate libcrc32c
 [102164.251305] Pid: 19024, comm: Xorg Tainted: G        WC   3.2.0-20-generic 
#33-Ubuntu
 [102164.251306] Call Trace:
 [102164.251309]  [<ffffffff8106726f>] warn_slowpath_common+0x7f/0xc0
 [102164.251310]  [<ffffffff810672ca>] warn_slowpath_null+0x1a/0x20
 [102164.251315]  [<ffffffffa01939d4>] __gen6_gt_wait_for_fifo+0x94/0xa0 [i915]
 [102164.251319]  [<ffffffffa0194055>] i915_write32+0xe5/0xf0 [i915]
 [102164.251326]  [<ffffffffa01d0241>] ring_write_tail+0x21/0x30 [i915]
 [102164.251331]  [<ffffffffa01d2833>] 
intel_emit_post_sync_nonzero_flush+0xd3/0x190 [i915]
 [102164.251337]  [<ffffffffa01d2913>] gen6_render_ring_flush+0x23/0xf0 [i915]
 [102164.251339]  [<ffffffff810307c8>] ? native_smp_send_reschedule+0x48/0x60
 [102164.251344]  [<ffffffffa01a555e>] i915_gem_flush_ring.part.26+0x3e/0xd0 
[i915]
 [102164.251350]  [<ffffffffa01a5f99>] i915_gem_flush_ring+0x19/0x20 [i915]
 [102164.251355]  [<ffffffffa01aaf60>] 
i915_gem_execbuffer_move_to_gpu+0x1b0/0x200 [i915]
 [102164.251360]  [<ffffffffa01ab64b>] 
i915_gem_do_execbuffer.isra.8+0x69b/0x940 [i915]
 [102164.251363]  [<ffffffff8108f02b>] ? __hrtimer_start_range_ns+0x16b/0x3a0
 [102164.251368]  [<ffffffffa01abdb3>] i915_gem_execbuffer2+0xa3/0x270 [i915]
 [102164.251373]  [<ffffffffa01295d4>] drm_ioctl+0x444/0x510 [drm]
 [102164.251378]  [<ffffffffa01abd10>] ? i915_gem_execbuffer+0x420/0x420 [i915]
 [102164.251380]  [<ffffffff8101dbf4>] ? restore_user_xstate+0x54/0xa0
 [102164.251382]  [<ffffffff81189d2a>] do_vfs_ioctl+0x8a/0x340
 [102164.251384]  [<ffffffff8118a071>] sys_ioctl+0x91/0xa0
 [102164.251386]  [<ffffffff81664502>] system_call_fastpath+0x16/0x1b
 [102164.251387] ---[ end trace dd6b4ef05c93f222 ]---
 [102164.256419] ------------[ cut here ]------------
 [102164.256424] WARNING: at 
/build/buildd/linux-3.2.0/drivers/gpu/drm/i915/i915_drv.c:413 
__gen6_gt_wait_for_fifo+0x94/0xa0 [i915]()
 [102164.256425] Hardware name: 4294CTO
 [102164.256426] Modules linked in: parport_pc ppdev usbhid hid ip6table_filter 
ip6_tables ebtable_nat ebtables xt_state ipt_REJECT xt_CHECKSUM iptable_mangle 
xt_tcpudp iptable_filter snd_hda_codec_hdmi snd_hda_codec_conexant joydev 
ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 nf_conntrack nf_defrag_ipv4 
ip_tables x_tables bridge kvm_intel stp kvm rfcomm bnep binfmt_misc arc4 
snd_hda_intel snd_hda_codec snd_hwdep snd_pcm snd_seq_midi snd_rawmidi psmouse 
serio_raw thinkpad_acpi nvram snd_seq_midi_event tpm_tis wmi mac_hid wacom 
snd_seq iwlwifi mac80211 snd_timer snd_seq_device btusb mei(C) bluetooth 
cfg80211 i915 snd drm_kms_helper drm soundcore snd_page_alloc i2c_algo_bit 
video coretemp lp parport e1000e sdhci_pci sdhci btrfs zlib_deflate libcrc32c
 [102164.256449] Pid: 19024, comm: Xorg Tainted: G        WC   3.2.0-20-generic 
#33-Ubuntu
 [102164.256450] Call Trace:
 [102164.256452]  [<ffffffff8106726f>] warn_slowpath_common+0x7f/0xc0
 [102164.256454]  [<ffffffff810672ca>] warn_slowpath_null+0x1a/0x20
 [102164.256458]  [<ffffffffa01939d4>] __gen6_gt_wait_for_fifo+0x94/0xa0 [i915]
 [102164.256463]  [<ffffffffa0194055>] i915_write32+0xe5/0xf0 [i915]
 [102164.256469]  [<ffffffffa01d0241>] ring_write_tail+0x21/0x30 [i915]
 [102164.256475]  [<ffffffffa01d28de>] 
intel_emit_post_sync_nonzero_flush+0x17e/0x190 [i915]
 [102164.256481]  [<ffffffffa01d2913>] gen6_render_ring_flush+0x23/0xf0 [i915]
 [102164.256482]  [<ffffffff810307c8>] ? native_smp_send_reschedule+0x48/0x60
 [102164.256488]  [<ffffffffa01a555e>] i915_gem_flush_ring.part.26+0x3e/0xd0 
[i915]
 [102164.256493]  [<ffffffffa01a5f99>] i915_gem_flush_ring+0x19/0x20 [i915]
 [102164.256498]  [<ffffffffa01aaf60>] 
i915_gem_execbuffer_move_to_gpu+0x1b0/0x200 [i915]
 [102164.256504]  [<ffffffffa01ab64b>] 
i915_gem_do_execbuffer.isra.8+0x69b/0x940 [i915]
 [102164.256513]  [<ffffffff8108f02b>] ? __hrtimer_start_range_ns+0x16b/0x3a0
 [102164.256519]  [<ffffffffa01abdb3>] i915_gem_execbuffer2+0xa3/0x270 [i915]
 [102164.256525]  [<ffffffffa01295d4>] drm_ioctl+0x444/0x510 [drm]
 [102164.256534]  [<ffffffffa01abd10>] ? i915_gem_execbuffer+0x420/0x420 [i915]
 [102164.256538]  [<ffffffff8101dbf4>] ? restore_user_xstate+0x54/0xa0
 [102164.256541]  [<ffffffff81189d2a>] do_vfs_ioctl+0x8a/0x340
 [102164.256544]  [<ffffffff8118a071>] sys_ioctl+0x91/0xa0
 [102164.256547]  [<ffffffff81664502>] system_call_fastpath+0x16/0x1b
 [102164.256549] ---[ end trace dd6b4ef05c93f223 ]---
 [102164.261584] ------------[ cut here ]------------
 [102164.261589] WARNING: at 
/build/buildd/linux-3.2.0/drivers/gpu/drm/i915/i915_drv.c:413 
__gen6_gt_wait_for_fifo+0x94/0xa0 [i915]()
 [102164.261591] Hardware name: 4294CTO
 [102164.261591] Modules linked in: parport_pc ppdev usbhid hid ip6table_filter 
ip6_tables ebtable_nat ebtables xt_state ipt_REJECT xt_CHECKSUM iptable_mangle 
xt_tcpudp iptable_filter snd_hda_codec_hdmi snd_hda_codec_conexant joydev 
ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 nf_conntrack nf_defrag_ipv4 
ip_tables x_tables bridge kvm_intel stp kvm rfcomm bnep binfmt_misc arc4 
snd_hda_intel snd_hda_codec snd_hwdep snd_pcm snd_seq_midi snd_rawmidi psmouse 
serio_raw thinkpad_acpi nvram snd_seq_midi_event tpm_tis wmi mac_hid wacom 
snd_seq iwlwifi mac80211 snd_timer snd_seq_device btusb mei(C) bluetooth 
cfg80211 i915 snd drm_kms_helper drm soundcore snd_page_alloc i2c_algo_bit 
video coretemp lp parport e1000e sdhci_pci sdhci btrfs zlib_deflate libcrc32c
 [102164.261615] Pid: 19024, comm: Xorg Tainted: G        WC   3.2.0-20-generic 
#33-Ubuntu
 [102164.261616] Call Trace:
 [102164.261618]  [<ffffffff8106726f>] warn_slowpath_common+0x7f/0xc0
 [102164.261620]  [<ffffffff810672ca>] warn_slowpath_null+0x1a/0x20
 [102164.261625]  [<ffffffffa01939d4>] __gen6_gt_wait_for_fifo+0x94/0xa0 [i915]
 [102164.261629]  [<ffffffffa0194055>] i915_write32+0xe5/0xf0 [i915]
 [102164.261635]  [<ffffffffa01d0241>] ring_write_tail+0x21/0x30 [i915]
 [102164.261641]  [<ffffffffa01d29c6>] gen6_render_ring_flush+0xd6/0xf0 [i915]
 [102164.261647]  [<ffffffffa01a555e>] i915_gem_flush_ring.part.26+0x3e/0xd0 
[i915]
 [102164.261652]  [<ffffffffa01a5f99>] i915_gem_flush_ring+0x19/0x20 [i915]
 [102164.261657]  [<ffffffffa01aaf60>] 
i915_gem_execbuffer_move_to_gpu+0x1b0/0x200 [i915]
 [102164.261662]  [<ffffffffa01ab64b>] 
i915_gem_do_execbuffer.isra.8+0x69b/0x940 [i915]
 [102164.261665]  [<ffffffff8108f02b>] ? __hrtimer_start_range_ns+0x16b/0x3a0
 [102164.261670]  [<ffffffffa01abdb3>] i915_gem_execbuffer2+0xa3/0x270 [i915]
 [102164.261675]  [<ffffffffa01295d4>] drm_ioctl+0x444/0x510 [drm]
 [102164.261680]  [<ffffffffa01abd10>] ? i915_gem_execbuffer+0x420/0x420 [i915]
 [102164.261682]  [<ffffffff8101dbf4>] ? restore_user_xstate+0x54/0xa0
 [102164.261684]  [<ffffffff81189d2a>] do_vfs_ioctl+0x8a/0x340
 [102164.261686]  [<ffffffff8118a071>] sys_ioctl+0x91/0xa0
 [102164.261688]  [<ffffffff81664502>] system_call_fastpath+0x16/0x1b
 [102164.261689] ---[ end trace dd6b4ef05c93f224 ]---
 [102164.266724] ------------[ cut here ]------------
 [102164.266729] WARNING: at 
/build/buildd/linux-3.2.0/drivers/gpu/drm/i915/i915_drv.c:413 
__gen6_gt_wait_for_fifo+0x94/0xa0 [i915]()
 [102164.266730] Hardware name: 4294CTO
 [102164.266731] Modules linked in: parport_pc ppdev usbhid hid ip6table_filter 
ip6_tables ebtable_nat ebtables xt_state ipt_REJECT xt_CHECKSUM iptable_mangle 
xt_tcpudp iptable_filter snd_hda_codec_hdmi snd_hda_codec_conexant joydev 
ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 nf_conntrack nf_defrag_ipv4 
ip_tables x_tables bridge kvm_intel stp kvm rfcomm bnep binfmt_misc arc4 
snd_hda_intel snd_hda_codec snd_hwdep snd_pcm snd_seq_midi snd_rawmidi psmouse 
serio_raw thinkpad_acpi nvram snd_seq_midi_event tpm_tis wmi mac_hid wacom 
snd_seq iwlwifi mac80211 snd_timer snd_seq_device btusb mei(C) bluetooth 
cfg80211 i915 snd drm_kms_helper drm soundcore snd_page_alloc i2c_algo_bit 
video coretemp lp parport e1000e sdhci_pci sdhci btrfs zlib_deflate libcrc32c
 [102164.266754] Pid: 19024, comm: Xorg Tainted: G        WC   3.2.0-20-generic 
#33-Ubuntu
 [102164.266755] Call Trace:
 [102164.266757]  [<ffffffff8106726f>] warn_slowpath_common+0x7f/0xc0
 [102164.266759]  [<ffffffff810672ca>] warn_slowpath_null+0x1a/0x20
 [102164.266763]  [<ffffffffa01939d4>] __gen6_gt_wait_for_fifo+0x94/0xa0 [i915]
 [102164.266768]  [<ffffffffa0194055>] i915_write32+0xe5/0xf0 [i915]
 [102164.266774]  [<ffffffffa01d0be2>] gen6_ring_get_irq+0xb2/0xd0 [i915]
 [102164.266780]  [<ffffffffa01d0c18>] blt_ring_get_irq+0x18/0x20 [i915]
 [102164.266785]  [<ffffffffa01a5b63>] i915_wait_request+0x183/0x560 [i915]
 [102164.266791]  [<ffffffffa01d0241>] ? ring_write_tail+0x21/0x30 [i915]
 [102164.266797]  [<ffffffffa01d29c6>] ? gen6_render_ring_flush+0xd6/0xf0 [i915]
 [102164.266802]  [<ffffffffa01a5f72>] i915_gem_object_wait_rendering+0x32/0x40 
[i915]
 [102164.266807]  [<ffffffffa01aad2d>] 
i915_gem_execbuffer_sync_rings+0xdd/0x160 [i915]
 [102164.266812]  [<ffffffffa01aaf1e>] 
i915_gem_execbuffer_move_to_gpu+0x16e/0x200 [i915]
 [102164.266818]  [<ffffffffa01ab64b>] 
i915_gem_do_execbuffer.isra.8+0x69b/0x940 [i915]
 [102164.266820]  [<ffffffff8108f02b>] ? __hrtimer_start_range_ns+0x16b/0x3a0
 [102164.266825]  [<ffffffffa01abdb3>] i915_gem_execbuffer2+0xa3/0x270 [i915]
 [102164.266830]  [<ffffffffa01295d4>] drm_ioctl+0x444/0x510 [drm]
 [102164.266836]  [<ffffffffa01abd10>] ? i915_gem_execbuffer+0x420/0x420 [i915]
 [102164.266838]  [<ffffffff8101dbf4>] ? restore_user_xstate+0x54/0xa0
 [102164.266840]  [<ffffffff81189d2a>] do_vfs_ioctl+0x8a/0x340
 [102164.266841]  [<ffffffff8118a071>] sys_ioctl+0x91/0xa0
 [102164.266843]  [<ffffffff81664502>] system_call_fastpath+0x16/0x1b
 [102164.266844] ---[ end trace dd6b4ef05c93f225 ]---
 [102164.271870] ------------[ cut here ]------------
 [102164.271875] WARNING: at 
/build/buildd/linux-3.2.0/drivers/gpu/drm/i915/i915_drv.c:413 
__gen6_gt_wait_for_fifo+0x94/0xa0 [i915]()
 [102164.271876] Hardware name: 4294CTO
 [102164.271877] Modules linked in: parport_pc ppdev usbhid hid ip6table_filter 
ip6_tables ebtable_nat ebtables xt_state ipt_REJECT xt_CHECKSUM iptable_mangle 
xt_tcpudp iptable_filter snd_hda_codec_hdmi snd_hda_codec_conexant joydev 
ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 nf_conntrack nf_defrag_ipv4 
ip_tables x_tables bridge kvm_intel stp kvm rfcomm bnep binfmt_misc arc4 
snd_hda_intel snd_hda_codec snd_hwdep snd_pcm snd_seq_midi snd_rawmidi psmouse 
serio_raw thinkpad_acpi nvram snd_seq_midi_event tpm_tis wmi mac_hid wacom 
snd_seq iwlwifi mac80211 snd_timer snd_seq_device btusb mei(C) bluetooth 
cfg80211 i915 snd drm_kms_helper drm soundcore snd_page_alloc i2c_algo_bit 
video coretemp lp parport e1000e sdhci_pci sdhci btrfs zlib_deflate libcrc32c
 [102164.271901] Pid: 19024, comm: Xorg Tainted: G        WC   3.2.0-20-generic 
#33-Ubuntu
 [102164.271902] Call Trace:
 [102164.271904]  [<ffffffff8106726f>] warn_slowpath_common+0x7f/0xc0
 [102164.271905]  [<ffffffff810672ca>] warn_slowpath_null+0x1a/0x20
 [102164.271910]  [<ffffffffa01939d4>] __gen6_gt_wait_for_fifo+0x94/0xa0 [i915]
 [102164.271915]  [<ffffffffa0194055>] i915_write32+0xe5/0xf0 [i915]
 [102164.271921]  [<ffffffffa01d0682>] gen6_ring_put_irq+0xa2/0xc0 [i915]
 [102164.271926]  [<ffffffffa01d06b8>] blt_ring_put_irq+0x18/0x20 [i915]
 [102164.271931]  [<ffffffffa01a5b97>] i915_wait_request+0x1b7/0x560 [i915]
 [102164.271933]  [<ffffffff8108aef0>] ? add_wait_queue+0x60/0x60
 [102164.271938]  [<ffffffffa01a5f72>] i915_gem_object_wait_rendering+0x32/0x40 
[i915]
 [102164.271944]  [<ffffffffa01aad2d>] 
i915_gem_execbuffer_sync_rings+0xdd/0x160 [i915]
 [102164.271949]  [<ffffffffa01aaf1e>] 
i915_gem_execbuffer_move_to_gpu+0x16e/0x200 [i915]
 [102164.271954]  [<ffffffffa01ab64b>] 
i915_gem_do_execbuffer.isra.8+0x69b/0x940 [i915]
 [102164.271956]  [<ffffffff8108f02b>] ? __hrtimer_start_range_ns+0x16b/0x3a0
 [102164.271962]  [<ffffffffa01abdb3>] i915_gem_execbuffer2+0xa3/0x270 [i915]
 [102164.271967]  [<ffffffffa01295d4>] drm_ioctl+0x444/0x510 [drm]
 [102164.271972]  [<ffffffffa01abd10>] ? i915_gem_execbuffer+0x420/0x420 [i915]
 [102164.271974]  [<ffffffff8101dbf4>] ? restore_user_xstate+0x54/0xa0
 [102164.271976]  [<ffffffff81189d2a>] do_vfs_ioctl+0x8a/0x340
 [102164.271978]  [<ffffffff8118a071>] sys_ioctl+0x91/0xa0
 [102164.271979]  [<ffffffff81664502>] system_call_fastpath+0x16/0x1b
 [102164.271981] ---[ end trace dd6b4ef05c93f226 ]---
 [102164.277029] ------------[ cut here ]------------
 [102164.277034] WARNING: at 
/build/buildd/linux-3.2.0/drivers/gpu/drm/i915/i915_drv.c:413 
__gen6_gt_wait_for_fifo+0x94/0xa0 [i915]()
 [102164.277035] Hardware name: 4294CTO
 [102164.277036] Modules linked in: parport_pc ppdev usbhid hid ip6table_filter 
ip6_tables ebtable_nat ebtables xt_state ipt_REJECT xt_CHECKSUM iptable_mangle 
xt_tcpudp iptable_filter snd_hda_codec_hdmi snd_hda_codec_conexant joydev 
ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 nf_conntrack nf_defrag_ipv4 
ip_tables x_tables bridge kvm_intel stp kvm rfcomm bnep binfmt_misc arc4 
snd_hda_intel snd_hda_codec snd_hwdep snd_pcm snd_seq_midi snd_rawmidi psmouse 
serio_raw thinkpad_acpi nvram snd_seq_midi_event tpm_tis wmi mac_hid wacom 
snd_seq iwlwifi mac80211 snd_timer snd_seq_device btusb mei(C) bluetooth 
cfg80211 i915 snd drm_kms_helper drm soundcore snd_page_alloc i2c_algo_bit 
video coretemp lp parport e1000e sdhci_pci sdhci btrfs zlib_deflate libcrc32c
 [102164.277059] Pid: 19024, comm: Xorg Tainted: G        WC   3.2.0-20-generic 
#33-Ubuntu
 [102164.277060] Call Trace:
 [102164.277062]  [<ffffffff8106726f>] warn_slowpath_common+0x7f/0xc0
 [102164.277064]  [<ffffffff810672ca>] warn_slowpath_null+0x1a/0x20
 [102164.277068]  [<ffffffffa01939d4>] __gen6_gt_wait_for_fifo+0x94/0xa0 [i915]
 [102164.277073]  [<ffffffffa0194055>] i915_write32+0xe5/0xf0 [i915]
 [102164.277079]  [<ffffffffa01d0241>] ring_write_tail+0x21/0x30 [i915]
 [102164.277085]  [<ffffffffa01d2833>] 
intel_emit_post_sync_nonzero_flush+0xd3/0x190 [i915]
 [102164.277091]  [<ffffffffa01d2913>] gen6_render_ring_flush+0x23/0xf0 [i915]
 [102164.277092]  [<ffffffff810307c8>] ? native_smp_send_reschedule+0x48/0x60
 [102164.277098]  [<ffffffffa01a555e>] i915_gem_flush_ring.part.26+0x3e/0xd0 
[i915]
 [102164.277103]  [<ffffffffa01a5f99>] i915_gem_flush_ring+0x19/0x20 [i915]
 [102164.277108]  [<ffffffffa01aaf60>] 
i915_gem_execbuffer_move_to_gpu+0x1b0/0x200 [i915]
 [102164.277114]  [<ffffffffa01ab64b>] 
i915_gem_do_execbuffer.isra.8+0x69b/0x940 [i915]
 [102164.277116]  [<ffffffff8108f02b>] ? __hrtimer_start_range_ns+0x16b/0x3a0
 [102164.277121]  [<ffffffffa01abdb3>] i915_gem_execbuffer2+0xa3/0x270 [i915]
 [102164.277126]  [<ffffffffa01295d4>] drm_ioctl+0x444/0x510 [drm]
 [102164.277131]  [<ffffffffa01abd10>] ? i915_gem_execbuffer+0x420/0x420 [i915]
 [102164.277133]  [<ffffffff8101dbf4>] ? restore_user_xstate+0x54/0xa0
 [102164.277135]  [<ffffffff81189d2a>] do_vfs_ioctl+0x8a/0x340
 [102164.277137]  [<ffffffff8118a071>] sys_ioctl+0x91/0xa0
 [102164.277139]  [<ffffffff81664502>] system_call_fastpath+0x16/0x1b
 [102164.277140] ---[ end trace dd6b4ef05c93f227 ]---
 [102164.282174] ------------[ cut here ]------------
 [102164.282180] WARNING: at 
/build/buildd/linux-3.2.0/drivers/gpu/drm/i915/i915_drv.c:413 
__gen6_gt_wait_for_fifo+0x94/0xa0 [i915]()
 [102164.282181] Hardware name: 4294CTO
 [102164.282182] Modules linked in: parport_pc ppdev usbhid hid ip6table_filter 
ip6_tables ebtable_nat ebtables xt_state ipt_REJECT xt_CHECKSUM iptable_mangle 
xt_tcpudp iptable_filter snd_hda_codec_hdmi snd_hda_codec_conexant joydev 
ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 nf_conntrack nf_defrag_ipv4 
ip_tables x_tables bridge kvm_intel stp kvm rfcomm bnep binfmt_misc arc4 
snd_hda_intel snd_hda_codec snd_hwdep snd_pcm snd_seq_midi snd_rawmidi psmouse 
serio_raw thinkpad_acpi nvram snd_seq_midi_event tpm_tis wmi mac_hid wacom 
snd_seq iwlwifi mac80211 snd_timer snd_seq_device btusb mei(C) bluetooth 
cfg80211 i915 snd drm_kms_helper drm soundcore snd_page_alloc i2c_algo_bit 
video coretemp lp parport e1000e sdhci_pci sdhci btrfs zlib_deflate libcrc32c
 [102164.282205] Pid: 19024, comm: Xorg Tainted: G        WC   3.2.0-20-generic 
#33-Ubuntu
 [102164.282206] Call Trace:
 [102164.282209]  [<ffffffff8106726f>] warn_slowpath_common+0x7f/0xc0
 [102164.282210]  [<ffffffff810672ca>] warn_slowpath_null+0x1a/0x20
 [102164.282215]  [<ffffffffa01939d4>] __gen6_gt_wait_for_fifo+0x94/0xa0 [i915]
 [102164.282220]  [<ffffffffa0194055>] i915_write32+0xe5/0xf0 [i915]
 [102164.282226]  [<ffffffffa01d0241>] ring_write_tail+0x21/0x30 [i915]
 [102164.282231]  [<ffffffffa01d28de>] 
intel_emit_post_sync_nonzero_flush+0x17e/0x190 [i915]
 [102164.282237]  [<ffffffffa01d2913>] gen6_render_ring_flush+0x23/0xf0 [i915]
 [102164.282239]  [<ffffffff810307c8>] ? native_smp_send_reschedule+0x48/0x60
 [102164.282244]  [<ffffffffa01a555e>] i915_gem_flush_ring.part.26+0x3e/0xd0 
[i915]
 [102164.282249]  [<ffffffffa01a5f99>] i915_gem_flush_ring+0x19/0x20 [i915]
 [102164.282255]  [<ffffffffa01aaf60>] 
i915_gem_execbuffer_move_to_gpu+0x1b0/0x200 [i915]
 [102164.282260]  [<ffffffffa01ab64b>] 
i915_gem_do_execbuffer.isra.8+0x69b/0x940 [i915]
 [102164.282262]  [<ffffffff8108f02b>] ? __hrtimer_start_range_ns+0x16b/0x3a0
 [102164.282267]  [<ffffffffa01abdb3>] i915_gem_execbuffer2+0xa3/0x270 [i915]
 [102164.282272]  [<ffffffffa01295d4>] drm_ioctl+0x444/0x510 [drm]
 [102164.282278]  [<ffffffffa01abd10>] ? i915_gem_execbuffer+0x420/0x420 [i915]
 [102164.282280]  [<ffffffff8101dbf4>] ? restore_user_xstate+0x54/0xa0
 [102164.282282]  [<ffffffff81189d2a>] do_vfs_ioctl+0x8a/0x340
 [102164.282284]  [<ffffffff8118a071>] sys_ioctl+0x91/0xa0
 [102164.282285]  [<ffffffff81664502>] system_call_fastpath+0x16/0x1b
 [102164.282287] ---[ end trace dd6b4ef05c93f228 ]---
 [102164.287321] ------------[ cut here ]------------
 [102164.287326] WARNING: at 
/build/buildd/linux-3.2.0/drivers/gpu/drm/i915/i915_drv.c:413 
__gen6_gt_wait_for_fifo+0x94/0xa0 [i915]()
 [102164.287327] Hardware name: 4294CTO
 [102164.287328] Modules linked in: parport_pc ppdev usbhid hid ip6table_filter 
ip6_tables ebtable_nat ebtables xt_state ipt_REJECT xt_CHECKSUM iptable_mangle 
xt_tcpudp iptable_filter snd_hda_codec_hdmi snd_hda_codec_conexant joydev 
ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 nf_conntrack nf_defrag_ipv4 
ip_tables x_tables bridge kvm_intel stp kvm rfcomm bnep binfmt_misc arc4 
snd_hda_intel snd_hda_codec snd_hwdep snd_pcm snd_seq_midi snd_rawmidi psmouse 
serio_raw thinkpad_acpi nvram snd_seq_midi_event tpm_tis wmi mac_hid wacom 
snd_seq iwlwifi mac80211 snd_timer snd_seq_device btusb mei(C) bluetooth 
cfg80211 i915 snd drm_kms_helper drm soundcore snd_page_alloc i2c_algo_bit 
video coretemp lp parport e1000e sdhci_pci sdhci btrfs zlib_deflate libcrc32c
 [102164.287351] Pid: 19024, comm: Xorg Tainted: G        WC   3.2.0-20-generic 
#33-Ubuntu
 [102164.287352] Call Trace:
 [102164.287354]  [<ffffffff8106726f>] warn_slowpath_common+0x7f/0xc0
 [102164.287356]  [<ffffffff810672ca>] warn_slowpath_null+0x1a/0x20
 [102164.287360]  [<ffffffffa01939d4>] __gen6_gt_wait_for_fifo+0x94/0xa0 [i915]
 [102164.287365]  [<ffffffffa0194055>] i915_write32+0xe5/0xf0 [i915]
 [102164.287371]  [<ffffffffa01d0241>] ring_write_tail+0x21/0x30 [i915]
 [102164.287377]  [<ffffffffa01d29c6>] gen6_render_ring_flush+0xd6/0xf0 [i915]
 [102164.287382]  [<ffffffffa01a555e>] i915_gem_flush_ring.part.26+0x3e/0xd0 
[i915]
 [102164.287387]  [<ffffffffa01a5f99>] i915_gem_flush_ring+0x19/0x20 [i915]
 [102164.287392]  [<ffffffffa01aaf60>] 
i915_gem_execbuffer_move_to_gpu+0x1b0/0x200 [i915]
 [102164.287398]  [<ffffffffa01ab64b>] 
i915_gem_do_execbuffer.isra.8+0x69b/0x940 [i915]
 [102164.287400]  [<ffffffff8108f02b>] ? __hrtimer_start_range_ns+0x16b/0x3a0
 [102164.287405]  [<ffffffffa01abdb3>] i915_gem_execbuffer2+0xa3/0x270 [i915]
 [102164.287410]  [<ffffffffa01295d4>] drm_ioctl+0x444/0x510 [drm]
 [102164.287416]  [<ffffffffa01abd10>] ? i915_gem_execbuffer+0x420/0x420 [i915]
 [102164.287418]  [<ffffffff8101dbf4>] ? restore_user_xstate+0x54/0xa0
 [102164.287420]  [<ffffffff81189d2a>] do_vfs_ioctl+0x8a/0x340
 [102164.287422]  [<ffffffff8118a071>] sys_ioctl+0x91/0xa0
 [102164.287423]  [<ffffffff81664502>] system_call_fastpath+0x16/0x1b
 [102164.287424] ---[ end trace dd6b4ef05c93f229 ]---
 [102164.292464] ------------[ cut here ]------------
 [102164.292469] WARNING: at 
/build/buildd/linux-3.2.0/drivers/gpu/drm/i915/i915_drv.c:413 
__gen6_gt_wait_for_fifo+0x94/0xa0 [i915]()
 [102164.292470] Hardware name: 4294CTO
 [102164.292471] Modules linked in: parport_pc ppdev usbhid hid ip6table_filter 
ip6_tables ebtable_nat ebtables xt_state ipt_REJECT xt_CHECKSUM iptable_mangle 
xt_tcpudp iptable_filter snd_hda_codec_hdmi snd_hda_codec_conexant joydev 
ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 nf_conntrack nf_defrag_ipv4 
ip_tables x_tables bridge kvm_intel stp kvm rfcomm bnep binfmt_misc arc4 
snd_hda_intel snd_hda_codec snd_hwdep snd_pcm snd_seq_midi snd_rawmidi psmouse 
serio_raw thinkpad_acpi nvram snd_seq_midi_event tpm_tis wmi mac_hid wacom 
snd_seq iwlwifi mac80211 snd_timer snd_seq_device btusb mei(C) bluetooth 
cfg80211 i915 snd drm_kms_helper drm soundcore snd_page_alloc i2c_algo_bit 
video coretemp lp parport e1000e sdhci_pci sdhci btrfs zlib_deflate libcrc32c
 [102164.292505] Pid: 19024, comm: Xorg Tainted: G        WC   3.2.0-20-generic 
#33-Ubuntu
 [102164.292506] Call Trace:
 [102164.292509]  [<ffffffff8106726f>] warn_slowpath_common+0x7f/0xc0
 [102164.292512]  [<ffffffff810672ca>] warn_slowpath_null+0x1a/0x20
 [102164.292518]  [<ffffffffa01939d4>] __gen6_gt_wait_for_fifo+0x94/0xa0 [i915]
 [102164.292524]  [<ffffffffa0194055>] i915_write32+0xe5/0xf0 [i915]
 [102164.292532]  [<ffffffffa01d0be2>] gen6_ring_get_irq+0xb2/0xd0 [i915]
 [102164.292540]  [<ffffffffa01d0c18>] blt_ring_get_irq+0x18/0x20 [i915]
 [102164.292547]  [<ffffffffa01a5b63>] i915_wait_request+0x183/0x560 [i915]
 [102164.292554]  [<ffffffffa01d0241>] ? ring_write_tail+0x21/0x30 [i915]
 [102164.292561]  [<ffffffffa01d29c6>] ? gen6_render_ring_flush+0xd6/0xf0 [i915]
 [102164.292568]  [<ffffffffa01a5f72>] i915_gem_object_wait_rendering+0x32/0x40 
[i915]
 [102164.292575]  [<ffffffffa01aad2d>] 
i915_gem_execbuffer_sync_rings+0xdd/0x160 [i915]
 [102164.292582]  [<ffffffffa01aaf1e>] 
i915_gem_execbuffer_move_to_gpu+0x16e/0x200 [i915]
 [102164.292589]  [<ffffffffa01ab64b>] 
i915_gem_do_execbuffer.isra.8+0x69b/0x940 [i915]
 [102164.292593]  [<ffffffff8108f02b>] ? __hrtimer_start_range_ns+0x16b/0x3a0
 [102164.292600]  [<ffffffffa01abdb3>] i915_gem_execbuffer2+0xa3/0x270 [i915]
 [102164.292606]  [<ffffffffa01295d4>] drm_ioctl+0x444/0x510 [drm]
 [102164.292613]  [<ffffffffa01abd10>] ? i915_gem_execbuffer+0x420/0x420 [i915]
 [102164.292617]  [<ffffffff8101dbf4>] ? restore_user_xstate+0x54/0xa0
 [102164.292620]  [<ffffffff81189d2a>] do_vfs_ioctl+0x8a/0x340
 [102164.292623]  [<ffffffff8118a071>] sys_ioctl+0x91/0xa0
 [102164.292626]  [<ffffffff81664502>] system_call_fastpath+0x16/0x1b
 [102164.292628] ---[ end trace dd6b4ef05c93f22a ]---
 [102164.297658] ------------[ cut here ]------------
 [102164.297662] WARNING: at 
/build/buildd/linux-3.2.0/drivers/gpu/drm/i915/i915_drv.c:413 
__gen6_gt_wait_for_fifo+0x94/0xa0 [i915]()
 [102164.297664] Hardware name: 4294CTO
 [102164.297664] Modules linked in: parport_pc ppdev usbhid hid ip6table_filter 
ip6_tables ebtable_nat ebtables xt_state ipt_REJECT xt_CHECKSUM iptable_mangle 
xt_tcpudp iptable_filter snd_hda_codec_hdmi snd_hda_codec_conexant joydev 
ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 nf_conntrack nf_defrag_ipv4 
ip_tables x_tables bridge kvm_intel stp kvm rfcomm bnep binfmt_misc arc4 
snd_hda_intel snd_hda_codec snd_hwdep snd_pcm snd_seq_midi snd_rawmidi psmouse 
serio_raw thinkpad_acpi nvram snd_seq_midi_event tpm_tis wmi mac_hid wacom 
snd_seq iwlwifi mac80211 snd_timer snd_seq_device btusb mei(C) bluetooth 
cfg80211 i915 snd drm_kms_helper drm soundcore snd_page_alloc i2c_algo_bit 
video coretemp lp parport e1000e sdhci_pci sdhci btrfs zlib_deflate libcrc32c
 [102164.297688] Pid: 19024, comm: Xorg Tainted: G        WC   3.2.0-20-generic 
#33-Ubuntu
 [102164.297689] Call Trace:
 [102164.297691]  [<ffffffff8106726f>] warn_slowpath_common+0x7f/0xc0
 [102164.297694]  [<ffffffff810672ca>] warn_slowpath_null+0x1a/0x20
 [102164.297700]  [<ffffffffa01939d4>] __gen6_gt_wait_for_fifo+0x94/0xa0 [i915]
 [102164.297707]  [<ffffffffa0194055>] i915_write32+0xe5/0xf0 [i915]
 [102164.297716]  [<ffffffffa01d0682>] gen6_ring_put_irq+0xa2/0xc0 [i915]
 [102164.297723]  [<ffffffffa01d06b8>] blt_ring_put_irq+0x18/0x20 [i915]
 [102164.297728]  [<ffffffffa01a5b97>] i915_wait_request+0x1b7/0x560 [i915]
 [102164.297730]  [<ffffffff8108aef0>] ? add_wait_queue+0x60/0x60
 [102164.297735]  [<ffffffffa01a5f72>] i915_gem_object_wait_rendering+0x32/0x40 
[i915]
 [102164.297740]  [<ffffffffa01aad2d>] 
i915_gem_execbuffer_sync_rings+0xdd/0x160 [i915]
 [102164.297746]  [<ffffffffa01aaf1e>] 
i915_gem_execbuffer_move_to_gpu+0x16e/0x200 [i915]
 [102164.297751]  [<ffffffffa01ab64b>] 
i915_gem_do_execbuffer.isra.8+0x69b/0x940 [i915]
 [102164.297753]  [<ffffffff8108f02b>] ? __hrtimer_start_range_ns+0x16b/0x3a0
 [102164.297758]  [<ffffffffa01abdb3>] i915_gem_execbuffer2+0xa3/0x270 [i915]
 [102164.297763]  [<ffffffffa01295d4>] drm_ioctl+0x444/0x510 [drm]
 [102164.297769]  [<ffffffffa01abd10>] ? i915_gem_execbuffer+0x420/0x420 [i915]
 [102164.297771]  [<ffffffff8101dbf4>] ? restore_user_xstate+0x54/0xa0
 [102164.297773]  [<ffffffff81189d2a>] do_vfs_ioctl+0x8a/0x340
 [102164.297775]  [<ffffffff8118a071>] sys_ioctl+0x91/0xa0
 [102164.297776]  [<ffffffff81664502>] system_call_fastpath+0x16/0x1b
 [102164.297777] ---[ end trace dd6b4ef05c93f22b ]---
 [102164.302816] ------------[ cut here ]------------
 [102164.302821] WARNING: at 
/build/buildd/linux-3.2.0/drivers/gpu/drm/i915/i915_drv.c:413 
__gen6_gt_wait_for_fifo+0x94/0xa0 [i915]()
 [102164.302822] Hardware name: 4294CTO
 [102164.302823] Modules linked in: parport_pc ppdev usbhid hid ip6table_filter 
ip6_tables ebtable_nat ebtables xt_state ipt_REJECT xt_CHECKSUM iptable_mangle 
xt_tcpudp iptable_filter snd_hda_codec_hdmi snd_hda_codec_conexant joydev 
ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 nf_conntrack nf_defrag_ipv4 
ip_tables x_tables bridge kvm_intel stp kvm rfcomm bnep binfmt_misc arc4 
snd_hda_intel snd_hda_codec snd_hwdep snd_pcm snd_seq_midi snd_rawmidi psmouse 
serio_raw thinkpad_acpi nvram snd_seq_midi_event tpm_tis wmi mac_hid wacom 
snd_seq iwlwifi mac80211 snd_timer snd_seq_device btusb mei(C) bluetooth 
cfg80211 i915 snd drm_kms_helper drm soundcore snd_page_alloc i2c_algo_bit 
video coretemp lp parport e1000e sdhci_pci sdhci btrfs zlib_deflate libcrc32c
 [102164.302846] Pid: 19024, comm: Xorg Tainted: G        WC   3.2.0-20-generic 
#33-Ubuntu
 [102164.302847] Call Trace:
 [102164.302849]  [<ffffffff8106726f>] warn_slowpath_common+0x7f/0xc0
 [102164.302851]  [<ffffffff810672ca>] warn_slowpath_null+0x1a/0x20
 [102164.302856]  [<ffffffffa01939d4>] __gen6_gt_wait_for_fifo+0x94/0xa0 [i915]
 [102164.302860]  [<ffffffffa0194055>] i915_write32+0xe5/0xf0 [i915]
 [102164.302866]  [<ffffffffa01d0241>] ring_write_tail+0x21/0x30 [i915]
 [102164.302872]  [<ffffffffa01d2833>] 
intel_emit_post_sync_nonzero_flush+0xd3/0x190 [i915]
 [102164.302878]  [<ffffffffa01d2913>] gen6_render_ring_flush+0x23/0xf0 [i915]
 [102164.302880]  [<ffffffff810307c8>] ? native_smp_send_reschedule+0x48/0x60
 [102164.302885]  [<ffffffffa01a555e>] i915_gem_flush_ring.part.26+0x3e/0xd0 
[i915]
 [102164.302890]  [<ffffffffa01a5f99>] i915_gem_flush_ring+0x19/0x20 [i915]
 [102164.302896]  [<ffffffffa01aaf60>] 
i915_gem_execbuffer_move_to_gpu+0x1b0/0x200 [i915]
 [102164.302901]  [<ffffffffa01ab64b>] 
i915_gem_do_execbuffer.isra.8+0x69b/0x940 [i915]
 [102164.302903]  [<ffffffff8108f02b>] ? __hrtimer_start_range_ns+0x16b/0x3a0
 [102164.302908]  [<ffffffffa01abdb3>] i915_gem_execbuffer2+0xa3/0x270 [i915]
 [102164.302913]  [<ffffffffa01295d4>] drm_ioctl+0x444/0x510 [drm]
 [102164.302919]  [<ffffffffa01abd10>] ? i915_gem_execbuffer+0x420/0x420 [i915]
 [102164.302921]  [<ffffffff8101dbf4>] ? restore_user_xstate+0x54/0xa0
 [102164.302923]  [<ffffffff81189d2a>] do_vfs_ioctl+0x8a/0x340
 [102164.302925]  [<ffffffff8118a071>] sys_ioctl+0x91/0xa0
 [102164.302927]  [<ffffffff81664502>] system_call_fastpath+0x16/0x1b
 [102164.302928] ---[ end trace dd6b4ef05c93f22c ]---
 [102164.307956] ------------[ cut here ]------------
 [102164.307961] WARNING: at 
/build/buildd/linux-3.2.0/drivers/gpu/drm/i915/i915_drv.c:413 
__gen6_gt_wait_for_fifo+0x94/0xa0 [i915]()
 [102164.307962] Hardware name: 4294CTO
 [102164.307963] Modules linked in: parport_pc ppdev usbhid hid ip6table_filter 
ip6_tables ebtable_nat ebtables xt_state ipt_REJECT xt_CHECKSUM iptable_mangle 
xt_tcpudp iptable_filter snd_hda_codec_hdmi snd_hda_codec_conexant joydev 
ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 nf_conntrack nf_defrag_ipv4 
ip_tables x_tables bridge kvm_intel stp kvm rfcomm bnep binfmt_misc arc4 
snd_hda_intel snd_hda_codec snd_hwdep snd_pcm snd_seq_midi snd_rawmidi psmouse 
serio_raw thinkpad_acpi nvram snd_seq_midi_event tpm_tis wmi mac_hid wacom 
snd_seq iwlwifi mac80211 snd_timer snd_seq_device btusb mei(C) bluetooth 
cfg80211 i915 snd drm_kms_helper drm soundcore snd_page_alloc i2c_algo_bit 
video coretemp lp parport e1000e sdhci_pci sdhci btrfs zlib_deflate libcrc32c
 [102164.307987] Pid: 19024, comm: Xorg Tainted: G        WC   3.2.0-20-generic 
#33-Ubuntu
 [102164.307988] Call Trace:
 [102164.307990]  [<ffffffff8106726f>] warn_slowpath_common+0x7f/0xc0
 [102164.307992]  [<ffffffff810672ca>] warn_slowpath_null+0x1a/0x20
 [102164.307996]  [<ffffffffa01939d4>] __gen6_gt_wait_for_fifo+0x94/0xa0 [i915]
 [102164.308001]  [<ffffffffa0194055>] i915_write32+0xe5/0xf0 [i915]
 [102164.308007]  [<ffffffffa01d0241>] ring_write_tail+0x21/0x30 [i915]
 [102164.308013]  [<ffffffffa01d28de>] 
intel_emit_post_sync_nonzero_flush+0x17e/0x190 [i915]
 [102164.308018]  [<ffffffffa01d2913>] gen6_render_ring_flush+0x23/0xf0 [i915]
 [102164.308020]  [<ffffffff810307c8>] ? native_smp_send_reschedule+0x48/0x60
 [102164.308026]  [<ffffffffa01a555e>] i915_gem_flush_ring.part.26+0x3e/0xd0 
[i915]
 [102164.308031]  [<ffffffffa01a5f99>] i915_gem_flush_ring+0x19/0x20 [i915]
 [102164.308036]  [<ffffffffa01aaf60>] 
i915_gem_execbuffer_move_to_gpu+0x1b0/0x200 [i915]
 [102164.308041]  [<ffffffffa01ab64b>] 
i915_gem_do_execbuffer.isra.8+0x69b/0x940 [i915]
 [102164.308044]  [<ffffffff8108f02b>] ? __hrtimer_start_range_ns+0x16b/0x3a0
 [102164.308049]  [<ffffffffa01abdb3>] i915_gem_execbuffer2+0xa3/0x270 [i915]
 [102164.308054]  [<ffffffffa01295d4>] drm_ioctl+0x444/0x510 [drm]
 [102164.308059]  [<ffffffffa01abd10>] ? i915_gem_execbuffer+0x420/0x420 [i915]
 [102164.308061]  [<ffffffff8101dbf4>] ? restore_user_xstate+0x54/0xa0
 [102164.308063]  [<ffffffff81189d2a>] do_vfs_ioctl+0x8a/0x340
 [102164.308065]  [<ffffffff8118a071>] sys_ioctl+0x91/0xa0
 [102164.308067]  [<ffffffff81664502>] system_call_fastpath+0x16/0x1b
 [102164.308068] ---[ end trace dd6b4ef05c93f22d ]---
 [102168.577539] [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer 
elapsed... GPU hung
 [102168.579101] [drm] capturing error event; look for more information in 
/debug/dri/0/i915_error_state
 [102168.614230] [drm:i915_wait_request] *ERROR* i915_wait_request returns -11 
(awaiting 7210018 at 7210014, next 7210019)
 [102168.618072] [drm:init_ring_common] *ERROR* render ring initialization 
failed ctl 00000000 head 00000000 tail 00000000 start 00000000
 [102168.621692] [drm:init_ring_common] *ERROR* gen6 bsd ring initialization 
failed ctl 00000000 head 00000000 tail 00000000 start 00000000
 [102168.624814] [drm:init_ring_common] *ERROR* blt ring initialization failed 
ctl 00000000 head 00000000 tail 00000000 start 00000000
 [102170.586936] [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer 
elapsed... GPU hung
 [102170.589080] [drm:i915_wait_request] *ERROR* i915_wait_request returns -11 
(awaiting 7210021 at 7210014, next 7210022)
 [102170.589179] [drm:i915_reset] *ERROR* GPU hanging too fast, declaring 
wedged!
 [102170.589190] [drm:i915_reset] *ERROR* Failed to reset chip.

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https://bugs.launchpad.net/bugs/968520

Title:
  i915 GPU hang with WARNING: at
  /build/buildd/linux-3.2.0/drivers/gpu/drm/i915/i915_drv.c:413
  __gen6_gt_wait_for_fifo+0x94/0xa0 [i915]()

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