GDM (or X server?) does not handle screen turning off

[Tim Sviridov]

I have an issue where GDM (or X server?) seems to barf when an attached screen gets turned off and then GDM just displays blank on all screens even after turning that screen back on. Is there a setting somewhere to tell GDM what to do when a screen turns off/on?

Initially I thought this had to do with locking, but this happens even if I just press the power button on one of the screens.

This has been happening since at Debian 9 on this machine, and has been always happening on this machine (new as of April this year).

I do not have logs because systemd's journal defaults to volatile (on a tangent: why!?) and I only just now changed it to persistent and will have time to crash it probably tomorrow.
EDIT: Which unit holds the Xorg logs these days anyway?

[Head_on_a_Stick]

Which unit holds the Xorg logs these days anyway?

For GDM the logs are stored under ~/.local/share/xorg/

[Tim Sviridov]

Which unit holds the Xorg logs these days anyway?

For GDM the logs are stored under ~/.local/share/xorg/

I looked there but all I have is:

Code: Select all

-rw-r--r-- 1 tim tim 111K Aug 23 16:50 Xorg.1.log
-rw-r--r-- 1 tim tim 111K Aug 22 15:35 Xorg.1.log.old
-rw-r--r-- 1 tim tim  78K Jun 28 16:10 Xorg.2.log

There is nothing for today. And the .2 being from June makes me very suspicious.

[Tim Sviridov]

Okay, so the logs issue was because Wayland was running.

I thought that that may have been the cause of the screen issue as well, and I disabled Wayland both on GDM and the session.

Here are the Xorg log files.

~/.local/share/xorg: https://pastebin.com/pGny05FS
/var/lib/gdm3/.local/share/xorg: http://paste.debian.net/1100015/