4.15.0-44-generic #47 breaks Lenovo T470s suspend while docked

[Brandon Rochon]

To reproduce, lock the screen while the laptop is docked. Box will go into some hung state where the only solution is to hard poweroff. Doesn't happen while undocked. Reverting to 4.15.0-43 kernel fixes the problem.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: linux-image-4.15.0-44-generic 4.15.0-44.47
ProcVersionSignature: Ubuntu 4.15.0-44.47-generic 4.15.18
Uname: Linux 4.15.0-44-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.5
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: gdm 1218 F.... pulseaudio
                      rochon 2115 F.... pulseaudio
Date: Mon Jan 28 14:15:24 2019
InstallationDate: Installed on 2017-05-25 (613 days ago)
InstallationMedia: Ubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412)
MachineType: LENOVO 20HGS0CB00
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-44-generic root=UUID=d26c36c8-1296-4878-a755-84517190e94c ro quiet splash vt.handoff=1
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
RelatedPackageVersions:
 linux-restricted-modules-4.15.0-44-generic N/A
 linux-backports-modules-4.15.0-44-generic N/A
 linux-firmware 1.173.3
SourcePackage: linux
UpgradeStatus: Upgraded to bionic on 2018-05-08 (265 days ago)
dmi.bios.date: 09/14/2018
dmi.bios.vendor: LENOVO
dmi.bios.version: N1WET51W (1.30 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20HGS0CB00
dmi.board.vendor: LENOVO
dmi.board.version: SDK0J40697 WIN
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.modalias: dmi:bvnLENOVO:bvrN1WET51W(1.30):bd09/14/2018:svnLENOVO:pn20HGS0CB00:pvrThinkPadT470s:rvnLENOVO:rn20HGS0CB00:rvrSDK0J40697WIN:cvnLENOVO:ct10:cvrNone:
dmi.product.family: ThinkPad T470s
dmi.product.name: 20HGS0CB00
dmi.product.version: ThinkPad T470s
dmi.sys.vendor: LENOVO

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

This change was made by a bot.

[Cristian Lupascu (clupasq)]

I have the same problem on a Lenovo T470p.

[Oleg Cherkasov (o1e9)]

Some kind of similar issue on ThinkPad X250 20CM004EMN. Switching back to 4.15.0-43-generic solved the problem.

Booting with 4.15.0-44-generic on Ultra Dock station gives blank screen on login/display manager. Undocking does not solve the issue so only SysRq+REISUB or hard reboot help. X250 rejects to fall sleep on closed lid or Fn+4 combination. Tried on two different Ultra Dock stations with various monitors, the result is the same.

Booting with 4.15.0-44-generic undocked brings login/display manager as expected. It is possible to dock after that.

[Kai-Heng Feng (kaihengfeng)]

Please test this kernel:
https://people.canonical.com/~khfeng/lp1813663/

This commit is reverted in the test kernel:
"drm/i915/dp: Send DPCD ON for MST before phy_up"

[Kai-Heng Feng (kaihengfeng)]

Should be the same as LP: #1813663.

[Antti Palsola (antti.palsola)]

I have a similar issue with Lenovo ThinkPad X1 Carbon 20HR-002RMX, Lenovo ThinkPad Thunderbolt 3 Dock 40AC0135EU and linux-image-4.15.0-44-generic: The screen(s) go blank on the login screen (at the latest).

No issues with linux-image-4.15.0-43-generic.

[Andreas Biri (abiri)]

Similar issue (same as antti.palsola) on Lenovo ThinkPad T480s, Lenovo ThinkPad Thunderbolt 3 Dock and linux-image-4.15.0-44-generic. External monitors stop working after login in; work flawlessly under Windows 10 and with linux-image-4.15.0-43-generic.

Related bug report: https://bugs.launchpad.net/ubuntu/+bug/1813763

[Kai Wiechers (kai-wiechers)]

Same issue on Lenovo T480 with Thunderbolt 3 Dock.

[Taifu (marcoberi)]

Same problem here (also switching screen hangs everything) ThinkPad Pro Dock 40 A1

[Brandon Rochon (br0ch0n)]

Confirmed 4.15.0-45 fixes the problem. Thanks!