I'm affected with this issue on a Thinkpad T460P. My problem is slightly
different, though. I boot up my laptop while it is already docked, two
external screens are connected to the docking station. The display
manager initializes all three screens (laptop + both external screens)
and LXDE/Openbox combines them into one virtual desktop over all three
screens. When I try to switch off the laptop's screen via the command

xrandr --output eDP-1 --off --output HDMI-3 --off --output HDMI-2 --off
--output HDMI-1 --off --output DP-3-1 --mode 1920x1080 --pos 1920x0
--rotate normal --output DP-3-3 --off --output DP-3-2 --primary --mode
1920x1080 --pos 0x0 --rotate normal --output DP-3 --off --output DP-2
--off --output DP-1 --off

the system freezes and I see the exact same stacktrace in my syslog as posted 
in the duplicate issues #1813763 and #1813831.
Reverting to 4.15.0-43-generic fixes the problem for me.

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1813663

Title:
  External monitors does not work anymore 4.15.0-44

Status in linux package in Ubuntu:
  Confirmed
Status in linux source package in Bionic:
  Fix Released

Bug description:
  I am using a docking station for my laptop. After install the
  4.15.0-44 update my external monitors goes undetected after logging in
  or having the laptop closed.

  I am on 18.04.1 LTS with Intel® HD Graphics 620 (Kaby Lake GT2)
  Graphics.

  Going back to the 4.15.0-43 version makes it all work fine again.
  --- 
  ProblemType: Bug
  ApportVersion: 2.20.9-0ubuntu7.5
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  jonas      2407 F.... pulseaudio
  CurrentDesktop: ubuntu:GNOME
  DistroRelease: Ubuntu 18.04
  HibernationDevice: RESUME=UUID=80397b76-2ded-4f7d-adbf-dfdface8e2d4
  InstallationDate: Installed on 2018-10-17 (103 days ago)
  InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 
(20180725)
  MachineType: LENOVO 20HF004MMX
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-44-generic 
root=UUID=64cf1582-d574-4e2f-a40a-7942c40caf5d ro quiet splash vt.handoff=1
  ProcVersionSignature: Ubuntu 4.15.0-44.47-generic 4.15.18
  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
  Tags:  bionic
  Uname: Linux 4.15.0-44-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip docker kvm lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  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: 20HF004MMX
  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:pn20HF004MMX:pvrThinkPadT470s:rvnLENOVO:rn20HF004MMX:rvrSDK0J40697WIN:cvnLENOVO:ct10:cvrNone:
  dmi.product.family: ThinkPad T470s
  dmi.product.name: 20HF004MMX
  dmi.product.version: ThinkPad T470s
  dmi.sys.vendor: LENOVO

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1813663/+subscriptions

-- 
Mailing list: https://launchpad.net/~kernel-packages
Post to     : kernel-packages@lists.launchpad.net
Unsubscribe : https://launchpad.net/~kernel-packages
More help   : https://help.launchpad.net/ListHelp

Reply via email to