Hi there,
since upgrading from kernel 3.4.10 to 3.5.x or 3.6.2 (on Kubuntu
12.04) I am getting sporadic (but frequent) lockups when switching
displays using xrandr:
/usr/bin/xrandr -d :0.0 --output LVDS1 --off --output HDMI3
--mode 1600x1200 --primary --auto
sleep 2
/usr/bin/xrandr -d :0.0 --output HDMI2 --mode 1600x1200
--right-of HDMI3 --auto
$ uname -a
Linux orion 3.6.2 #41 SMP Tue Oct 16 23:45:38 CEST 2012 x86_64 x86_64
x86_64 GNU/Linux
00:02.0 VGA compatible controller: Intel Corporation 2nd Generation
Core Processor Family Integrated Graphics Controller (rev 09) (prog-if
00 [VGA controller])
Subsystem: Lenovo Device 21d2
Flags: bus master, fast devsel, latency 0, IRQ 46
Memory at f000 (64-bit, non-prefetchable) [size=4M]
Memory at e000 (64-bit, prefetchable) [size=256M]
I/O ports at 4000 [size=64]
Expansion ROM at unassigned [disabled]
Capabilities: access denied
Kernel driver in use: i915
Kernel modules: i915
When the lockup happens the local display is completely unresponsive,
but connecting via ssh shows the following stuck tasks:
[ 479.796787] INFO: task kworker/2:2:360 blocked for more than 120 seconds.
[ 479.796798] echo 0 /proc/sys/kernel/hung_task_timeout_secs
disables this message.
[ 479.796803] kworker/2:2 D 0 360 2 0x
[ 479.796815] 88020ffb7c30 0046 88020fcfa080
88020ffb7fd8
[ 479.796825] 88020ffb7fd8 88020ffb7fd8 8802148c2080
88020fcfa080
[ 479.796834] 88020fcfa790 8802024a 88020fcfa740
0002
[ 479.796844] Call Trace:
[ 479.796862] [81097e11] ? mark_held_locks+0x61/0x140
[ 479.796876] [815c44a5] ? mutex_lock_nested+0x1e5/0x320
[ 479.796890] [815c5a64] schedule+0x24/0x70
[ 479.796902] [815c5d79] schedule_preempt_disabled+0x9/0x10
[ 479.796915] [815c4411] mutex_lock_nested+0x151/0x320
[ 479.796956] [a00f79b1] ? output_poll_execute+0x51/0x1a0
[drm_kms_helper]
[ 479.796973] [a00f79b1] output_poll_execute+0x51/0x1a0
[drm_kms_helper]
[ 479.796984] [81060bba] process_one_work+0x18a/0x520
[ 479.796992] [81060b5e] ? process_one_work+0x12e/0x520
[ 479.797001] [812d2674] ? do_raw_spin_lock+0x54/0x120
[ 479.797016] [a00f7960] ?
drm_helper_connector_dpms+0x100/0x100 [drm_kms_helper]
[ 479.797032] [810613af] worker_thread+0x18f/0x4f0
[ 479.797039] [815c6cfa] ? _raw_spin_unlock_irqrestore+0x3a/0x70
[ 479.797047] [8109809d] ? trace_hardirqs_on+0xd/0x10
[ 479.797055] [81061220] ? rescuer_thread+0x290/0x290
[ 479.797063] [81066909] kthread+0xa9/0xb0
[ 479.797069] [8109809d] ? trace_hardirqs_on+0xd/0x10
[ 479.797078] [815cec44] kernel_thread_helper+0x4/0x10
[ 479.797085] [815c70b0] ? retint_restore_args+0x13/0x13
[ 479.797092] [81066860] ? __init_kthread_worker+0x70/0x70
[ 479.797098] [815cec40] ? gs_change+0x13/0x13
[ 479.797104] 3 locks held by kworker/2:2/360:
[ 479.797107] #0: (events_nrt){.+.+.+}, at: [81060b5e]
process_one_work+0x12e/0x520
[ 479.797125] #1:
(((dev-mode_config.output_poll_work)-work)){+.+.+.}, at:
[81060b5e] process_one_work+0x12e/0x520
[ 479.797140] #2: (dev-mode_config.mutex){+.+.+.}, at:
[a00f79b1] output_poll_execute+0x51/0x1a0 [drm_kms_helper]
[ 479.797185] INFO: task Xorg:1759 blocked for more than 120 seconds.
[ 479.797189] echo 0 /proc/sys/kernel/hung_task_timeout_secs
disables this message.
[ 479.797192] XorgD 0 1759 1716 0x0044
[ 479.797201] 880211091898 0046 880211999040
880211091fd8
[ 479.797211] 880211091fd8 880211091fd8 8801dd9ea080
880211999040
[ 479.797219] 880211999708 880211999040 0007
0006
[ 479.797228] Call Trace:
[ 479.797235] [81097e11] ? mark_held_locks+0x61/0x140
[ 479.797243] [815c6cfa] ? _raw_spin_unlock_irqrestore+0x3a/0x70
[ 479.797249] [81097ffd] ? trace_hardirqs_on_caller+0x10d/0x1a0
[ 479.797256] [8109809d] ? trace_hardirqs_on+0xd/0x10
[ 479.797265] [815c5a64] schedule+0x24/0x70
[ 479.797299] [a01253ad]
intel_crtc_wait_for_pending_flips+0x6d/0xc0 [i915]
[ 479.797307] [81067190] ? __init_waitqueue_head+0x60/0x60
[ 479.797337] [a0128f5d] ironlake_crtc_disable+0x4d/0x7a0 [i915]
[ 479.797363] [a0129749] ironlake_crtc_prepare+0x9/0x10 [i915]
[ 479.797379] [a00f7ebe]
drm_crtc_helper_set_mode+0x35e/0x520 [drm_kms_helper]
[ 479.797403] [a00f8a1d]
drm_crtc_helper_set_config+0x83d/0xaf0 [drm_kms_helper]
[ 479.797440] [a0071a1d] drm_mode_setcrtc+0x2ed/0x540 [drm]
[ 479.797466] [a00622dc] drm_ioctl+0x47c/0x540 [drm]
[ 479.797496] [a0071730] ?