Lenovo T440s hangs on the dock when unsleeping the monitor

[Martin D. Weinberg]

This issue has been a persistent but infrequent problem for many years with the T440s. It only occurs when the laptop is docked. I have reported this bug several times. However, with the current kernel release, 5.4.0-37, this occurs at least once a day. The kern.log lines are:

Jun 21 16:44:23 magpie kernel: [13992.853712] [drm:intel_set_cpu_fifo_underrun_r
eporting [i915]] *ERROR* uncleared fifo underrun on pipe B
Jun 21 16:44:23 magpie kernel: [13992.853749] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe B FIFO underrun
Jun 21 17:17:00 magpie kernel: [15950.119066] [drm:intel_set_cpu_fifo_underrun_reporting [i915]] *ERROR* uncleared fifo underrun on pipe B
Jun 21 17:17:00 magpie kernel: [15950.119101] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe B FIFO underrun
^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@

followed by a dead hang. The pattern is the same each time.

My current work around is to use the previous version of the released kernel, 5.4.0-33, which does not have this issue. I'm hoping someone has an idea. It's very frustrating.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: linux-image-5.4.0-37-generic 5.4.0-37.41
ProcVersionSignature: Ubuntu 5.4.0-37.41-generic 5.4.41
Uname: Linux 5.4.0-37-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.2
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC2: weinberg 3505 F.... pulseaudio
 /dev/snd/controlC1: weinberg 3505 F.... pulseaudio
 /dev/snd/controlC0: weinberg 3505 F.... pulseaudio
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Mon Jun 22 10:02:42 2020
EcryptfsInUse: Yes
HibernationDevice: RESUME=UUID=8d33a538-4ec4-418d-b277-be1a9a1c1113
InstallationDate: Installed on 2018-03-12 (832 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Alpha amd64 (20180114)
MachineType: LENOVO 20ARA0S100
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-37-generic root=UUID=b6683bc1-7dd5-4afd-8e70-f69253403b71 ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-5.4.0-37-generic N/A
 linux-backports-modules-5.4.0-37-generic N/A
 linux-firmware 1.187
SourcePackage: linux
UpgradeStatus: Upgraded to focal on 2020-04-24 (58 days ago)
dmi.bios.date: 03/19/2014
dmi.bios.vendor: LENOVO
dmi.bios.version: GJET74WW (2.24 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20ARA0S100
dmi.board.vendor: LENOVO
dmi.board.version: Not Defined
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias: dmi:bvnLENOVO:bvrGJET74WW(2.24):bd03/19/2014:svnLENOVO:pn20ARA0S100:pvrThinkPadT440s:rvnLENOVO:rn20ARA0S100:rvrNotDefined:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.family: ThinkPad T440s
dmi.product.name: 20ARA0S100
dmi.product.sku: LENOVO_MT_20AR_BU_Think_FM_ThinkPad T440s
dmi.product.version: ThinkPad T440s
dmi.sys.vendor: LENOVO

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This change was made by a bot.

[Martin D. Weinberg (martin-weinberg-5)]

This kernel also shows continuous rendering artifact on the native LCD screen, such as the windows underneath the current active window appear as flickering ghosts. No problems on the previous released kernel.

[You-Sheng Yang (vicamo)]

Could you attach full journal log when this happened? Thank you.

[Martin D. Weinberg (martin-weinberg-5)]

I ran it until it happened again. I'm attaching the syslog and kern.log from the time of the crash, which was Jun 28 at about 15:30. Doesn't seem to be a lot to go on here . . .

[Martin D. Weinberg (martin-weinberg-5)]

This seems to be the same problem reported here:

https://bugzilla.redhat.com/show_bug.cgi?id=1506339

[Kai-Heng Feng (kaihengfeng)]

Maybe there's a kernel panic? Please follow [1] and see if any panic gets logged.

[1] https://wiki.ubuntu.com/Kernel/CrashdumpRecipe