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 Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1813663 Title: External monitors does not work anymore 4.15.0-44 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1813663/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
