So here is the result of my investigation.
It's a bit limited due to my limited time. I hope it is usefule nonetheless.
3.13.0-37 bad
3.18-rc1-utopic good
3.14.3 good
3.13.11.9 bad
3.14-rc5 oopses, but slow with backlight control
3.14-rc1 seems to work, but only coarse grained, other oops related to HID it
seems
3.14.0 no oops, but very slow with the backlight control
3.15 very good
These are all the version I tested. Do you think it's worth testing
3.14.1 and 3.14.2?
FTR:
this is the 3.14-rc5 dmesg
[ 28.071810] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
[ 268.837067] ACPI: \_SB_.GDCK: undocking
[ 276.420729] usb 3-3.1: USB disconnect, device number 3
[ 276.453821] usb 3-3.2: USB disconnect, device number 4
[ 276.454468] usb 3-3.3: USB disconnect, device number 5
[ 276.474365] usb 3-3.4: USB disconnect, device number 6
[ 276.475409] ------------[ cut here ]------------
[ 276.475417] WARNING: CPU: 3 PID: 1528 at
/home/apw/COD/linux/fs/sysfs/group.c:216 sysfs_remove_group+0xa3/0xb0()
[ 276.475420] sysfs group ffffffff81caa180 not found for kobject 'hidraw1'
[ 276.475421] Modules linked in: ctr ccm rfcomm bnep binfmt_misc intel_rapl
x86_pkg_temp_thermal intel_powerclamp coretemp snd_hda_codec_hdmi kvm_intel
uvcvideo videobuf2_vmalloc kvm arc4 videobuf2_memops microcode videobuf2_core
iwldvm videodev mac80211 joydev serio_raw btusb snd_hda_codec_realtek bluetooth
snd_hda_codec_generic snd_hda_intel wacom 6lowpan_iphc snd_hda_codec iwlwifi
snd_hwdep lpc_ich cfg80211 snd_pcm thinkpad_acpi nvram mei_me mei nls_iso8859_1
snd_seq_midi snd_seq_midi_event snd_rawmidi snd_seq snd_seq_device snd_timer
snd parport_pc soundcore ppdev mac_hid lp parport dm_crypt hid_logitech_dj
hid_generic usbhid hid crct10dif_pclmul crc32_pclmul ghash_clmulni_intel
aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd psmouse i915
i2c_algo_bit drm_kms_helper e1000e drm ahci sdhci_pci libahci ptp sdhci
pps_core wmi video
[ 276.475476] CPU: 3 PID: 1528 Comm: upowerd Not tainted
3.14.0-031400rc5-generic #201403022235
[ 276.475478] Hardware name: LENOVO 3437B52/3437B52, BIOS GCETA0WW (2.60 )
09/12/2014
[ 276.475480] 00000000000000d8 ffff8800d3d77ce8 ffffffff8175a8bb
0000000000000007
[ 276.475483] ffff8800d3d77d38 ffff8800d3d77d28 ffffffff8106ab8c
ffff8800d3d77d18
[ 276.475486] ffffffff81caa180 ffff88020eb31c10 0000000000000000
ffff88020eb6c598
[ 276.475489] Call Trace:
[ 276.475494] [<ffffffff8175a8bb>] dump_stack+0x46/0x58
[ 276.475498] [<ffffffff8106ab8c>] warn_slowpath_common+0x8c/0xc0
[ 276.475502] [<ffffffff8106ac76>] warn_slowpath_fmt+0x46/0x50
[ 276.475505] [<ffffffff81248e33>] ? kernfs_find_and_get_ns+0x53/0x70
[ 276.475508] [<ffffffff81247903>] sysfs_remove_group+0xa3/0xb0
[ 276.475511] [<ffffffff814b58d0>] dpm_sysfs_remove+0x40/0x50
[ 276.475514] [<ffffffff814ab507>] device_del+0x47/0x1a0
[ 276.475517] [<ffffffff814ab682>] device_unregister+0x22/0x60
[ 276.475519] [<ffffffff814ab6fb>] device_destroy+0x3b/0x50
[ 276.475527] [<ffffffffa0298b20>] drop_ref+0x40/0xe0 [hid]
[ 276.475532] [<ffffffffa0298c5d>] hidraw_release+0x9d/0xb0 [hid]
[ 276.475536] [<ffffffff811d2f2d>] __fput+0xbd/0x270
[ 276.475539] [<ffffffff811d312e>] ____fput+0xe/0x10
[ 276.475543] [<ffffffff8108c987>] task_work_run+0xa7/0xe0
[ 276.475548] [<ffffffff81015e67>] do_notify_resume+0xc7/0xd0
[ 276.475551] [<ffffffff817711aa>] int_signal+0x12/0x17
[ 276.475553] ---[ end trace 8d1acbbed4f21eec ]---
and this the rc1
[ 39.162355] ACPI: \_SB_.GDCK: undocking
[ 39.884707] ata2: SATA link down (SStatus 0 SControl 300)
[ 44.886277] ata2: hard resetting link
[ 45.206340] ata2: SATA link down (SStatus 0 SControl 300)
[ 45.206365] ata2: limiting SATA link speed to 1.5 Gbps
[ 46.832007] usb 3-3.1: USB disconnect, device number 3
[ 46.866561] usb 3-3.2: USB disconnect, device number 4
[ 46.866826] usb 3-3.3: USB disconnect, device number 5
[ 46.907122] usb 3-3.4: USB disconnect, device number 6
[ 46.909135] ------------[ cut here ]------------
[ 46.909142] WARNING: CPU: 3 PID: 1532 at
/home/apw/COD/linux/fs/sysfs/group.c:216 sysfs_remove_group+0xa3/0xb0()
[ 46.909143] sysfs group ffffffff81caa0e0 not found for kobject 'hidraw1'
[ 46.909144] Modules linked in: ctr ccm rfcomm bnep binfmt_misc intel_rapl
x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm microcode
snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic uvcvideo
videobuf2_vmalloc snd_hda_intel videobuf2_memops joydev videobuf2_core
thinkpad_acpi snd_hda_codec serio_raw videodev snd_hwdep btusb arc4 bluetooth
nvram wacom snd_pcm iwldvm 6lowpan_iphc snd_seq_midi mac80211
snd_seq_midi_event nls_iso8859_1 snd_rawmidi snd_seq iwlwifi snd_seq_device
snd_timer cfg80211 lpc_ich parport_pc snd ppdev mei_me mei lp soundcore parport
mac_hid hid_logitech_dj hid_generic dm_crypt usbhid hid crct10dif_pclmul
crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul
glue_helper ablk_helper cryptd psmouse e1000e ahci sdhci_pci libahci i915 sdhci
ptp pps_core wmi video i2c_algo_bit drm_kms_helper drm
[ 46.909204] CPU: 3 PID: 1532 Comm: upowerd Not tainted
3.14.0-031400rc1-generic #201402022035
[ 46.909206] Hardware name: LENOVO 3437B52/3437B52, BIOS GCETA0WW (2.60 )
09/12/2014
[ 46.909207] 00000000000000d8 ffff88020f60dce8 ffffffff8174c7e1
0000000000000007
[ 46.909211] ffff88020f60dd38 ffff88020f60dd28 ffffffff8106ab6c
ffff88020f60dd18
[ 46.909214] ffffffff81caa0e0 ffff880035cfac10 0000000000000000
ffff880035d18d78
[ 46.909217] Call Trace:
[ 46.909223] [<ffffffff8174c7e1>] dump_stack+0x46/0x58
[ 46.909227] [<ffffffff8106ab6c>] warn_slowpath_common+0x8c/0xc0
[ 46.909230] [<ffffffff8106ac56>] warn_slowpath_fmt+0x46/0x50
[ 46.909233] [<ffffffff81247183>] ? kernfs_find_and_get_ns+0x53/0x70
[ 46.909236] [<ffffffff81245c53>] sysfs_remove_group+0xa3/0xb0
[ 46.909239] [<ffffffff814aee40>] dpm_sysfs_remove+0x40/0x50
[ 46.909243] [<ffffffff814a4ad7>] device_del+0x47/0x1a0
[ 46.909246] [<ffffffff814a4c52>] device_unregister+0x22/0x60
[ 46.909248] [<ffffffff814a4ccb>] device_destroy+0x3b/0x50
[ 46.909256] [<ffffffffa027faf0>] drop_ref+0x40/0xe0 [hid]
[ 46.909261] [<ffffffffa027fc2d>] hidraw_release+0x9d/0xb0 [hid]
[ 46.909264] [<ffffffff811d1c4d>] __fput+0xbd/0x270
[ 46.909267] [<ffffffff811d1e4e>] ____fput+0xe/0x10
[ 46.909270] [<ffffffff8108c707>] task_work_run+0xa7/0xe0
[ 46.909275] [<ffffffff81015e67>] do_notify_resume+0xc7/0xd0
[ 46.909278] [<ffffffff81762eaa>] int_signal+0x12/0x17
[ 46.909280] ---[ end trace 94fb543f0b349379 ]---
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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https://bugs.launchpad.net/bugs/1386597
Title:
Oopses when ejecting thinkpad x230t from docking station with extern
DP monitor
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