video not working after resume

[Dustin Kirkland ]

I suspended my x250. Then plugged it in (overnight). Then unplugged it. Then opened it. It resumed, but video did not work. I closed the lid and opened it, a few times. No dice. Then, I pressed the power button, and the video came back on. I was sitting next to Leann, Chris, and Brad here at the CDO Sprint.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.4.0-21-generic 4.4.0-21.37
ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
Uname: Linux 4.4.0-21-generic x86_64
NonfreeKernelModules: zfs zunicode zcommon znvpair zavl
ApportVersion: 2.20.1-0ubuntu2
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: kirkland 4510 F.... pulseaudio
 /dev/snd/pcmC1D0p: kirkland 4510 F...m pulseaudio
 /dev/snd/controlC1: kirkland 4510 F.... pulseaudio
CurrentDesktop: Unity
Date: Tue May 3 08:18:10 2016
EcryptfsInUse: Yes
InstallationDate: Installed on 2015-05-15 (354 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
MachineType: LENOVO 20CMCTO1WW
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-21-generic root=UUID=a4d6a56a-7b1b-4a7c-8420-f2b8e6d15c37 ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-4.4.0-21-generic N/A
 linux-backports-modules-4.4.0-21-generic N/A
 linux-firmware 1.157
SourcePackage: linux
SystemImageInfo: Error: command ['system-image-cli', '-i'] failed with exit code 2:
UpgradeStatus: Upgraded to xenial on 2016-01-04 (119 days ago)
dmi.bios.date: 03/05/2015
dmi.bios.vendor: LENOVO
dmi.bios.version: N10ET30W (1.07 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20CMCTO1WW
dmi.board.vendor: LENOVO
dmi.board.version: 0B98417 PRO
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.modalias: dmi:bvnLENOVO:bvrN10ET30W(1.07):bd03/05/2015:svnLENOVO:pn20CMCTO1WW:pvrThinkpadX250:rvnLENOVO:rn20CMCTO1WW:rvr0B98417PRO:cvnLENOVO:ct10:cvrNone:
dmi.product.name: 20CMCTO1WW
dmi.product.version: Thinkpad X250
dmi.sys.vendor: LENOVO

[Brad Figg (brad-figg)]

This change was made by a bot.

[Joseph Salisbury (jsalisbury)]

Do you have some time to test some kernels? We can bisect down to the commit that introduced this once we know the last good 4.4 kernel and the first bad one.

[Joseph Salisbury (jsalisbury)]

There are a bunch of traces in the logs:

[52472.190933] Freezing user space processes ...
[52492.195179] Freezing of tasks failed after 20.003 seconds (1 tasks refusing to freeze, wq_busy=0):
[52492.195506] fstrim D ffff880146613a98 0 28271 28270 0x00000004
[52492.195515] ffff880146613a98 ffff880146613a88 ffff88043bad9b80 ffff8803aa4bb700
[52492.195521] ffff880146614000 ffff88044dc96d00 7fffffffffffffff ffff8803aa4bb700
[52492.195527] 000000000245f288 ffff880146613ab0 ffffffff818203f5 0000000000000000
[52492.195532] Call Trace:
[52492.195546] [<ffffffff818203f5>] schedule+0x35/0x80
[52492.195553] [<ffffffff81823515>] schedule_timeout+0x1b5/0x270
[52492.195560] [<ffffffff8181f944>] io_schedule_timeout+0xa4/0x110
[52492.195566] [<ffffffff81821903>] wait_for_completion_io+0xb3/0x140
[52492.195572] [<ffffffff810abde0>] ? wake_up_q+0x70/0x70
[52492.195578] [<ffffffff813c2836>] blkdev_issue_discard+0x1f6/0x250
[52492.195586] [<ffffffff812d5aff>] ext4_trim_fs+0x49f/0xa20
[52492.195594] [<ffffffff812a11d9>] ext4_ioctl+0xdb9/0x1220
[52492.195600] [<ffffffff81211ae3>] ? cp_new_stat+0x153/0x180
[52492.195607] [<ffffffff81301028>] ecryptfs_unlocked_ioctl+0x48/0x80
[52492.195612] [<ffffffff812200ff>] do_vfs_ioctl+0x29f/0x490
[52492.195617] [<ffffffff81211c64>] ? SYSC_newfstat+0x34/0x60
[52492.195622] [<ffffffff81220369>] SyS_ioctl+0x79/0x90
[52492.195629] [<ffffffff818244f2>] entry_SYSCALL_64_fastpath+0x16/0x71