On Fri, 2019-04-26 at 00:13 +0200, Diego Nicola Barbato wrote: > Hi Ben, > > Ben Sturmfels writes: > > > Hi Ludovic, > > > > On Thu, 2019-04-25 at 11:08 +0200, Ludovic Courtès wrote: > > > > > > Ben Sturmfels skribis: > > > > > > > I was previously using a 24" Samsung external monitor with my > > > > X200 Guix System via VGA. Since the switch to GDM, I no longer > > > > seem to be able connect this monitor. When I do, the laptop > > > > screen just keeps flashing. > > > > > > So the GDM login screen never shows up, right? > > > > I'm thoroughly confused now. GDM definitely *was* working with the > > laptop screen only, but now when I reconfigure it or choose an old > > Grub entry, I can't get to the login screen with either external > > monitor or the laptop. In both cases the console loops showing a > > message > > something > > like: > > > > New session c1 of user gdm. > > Removed session c1. > > . > > . > > . > > New session c506 of user gdm. > > Removed session c506. > > This sounds familiar. Can you check if /var/lib/gdm is owned by gdm. > If it isn't, chowning it back to gdm:gdm should fix it. Thanks Diego. After booting up the system and waiting for the GDM to stop restarting: $ sudo ls -la /var/lib/gdm/ total 32 drwx------ 5 gdm gdm 4096 Apr 24 20:12 ./ drwxr-xr-x 13 root root 4096 Apr 10 12:13 ../ drwxr-xr-x 5 983 gdm 4096 Apr 14 22:02 .cache/ drwxr-xr-x 5 983 gdm 4096 Apr 14 22:02 .config/ -rw------- 1 983 gdm 16 Apr 14 22:02 .esd_auth -rw------- 1 983 gdm 5216 Apr 24 20:12 .ICEauthority drwxr-xr-x 3 983 gdm 4096 Apr 10 14:49 .local/ For good measure I ran the following anyway, but it didn't seem to fix it: $ sudo chmod -R gdm:gdm /var/lib/gdm $ sudo herd restart xorg-server Ludovic, the Xorg.0.log file does seem to be fresh now and showing an error so I've attached that. Danny, I'm struggling with reconfiguring using the gnu/services/xorg.scm with "debug"'s "Enable=true" - haven't run from source for a while. Will take another look at that when I get some clear time this weekend.