I found a reproducible crash on xserver 1.20, with Intel gfx and the modesetting driver. Just switching to another VT, then coming back crashes the server:
[ 213.548] (II) AIGLX: Resuming AIGLX clients after VT switch
[ 213.560] (EE) modeset(0): failed to set mode: Invalid argument
[ 213.560] (EE)
Fatal server error:
[ 213.560] (EE) EnterVT failed for screen 0
This is with systemd 239, linux 4.16.16 from Debian unstable. I have an external screen connected via DP through the thinkpad X230's docking station.
Created attachment 140448 [details]
(In reply to Emilio Pozuelo Monfort from comment #0)
> This is with systemd 239, linux 4.16.16 from Debian unstable. I have an
> external screen connected via DP through the thinkpad X230's docking station.
This doesn't happen when the laptop is undocked (i.e. no external display connected).
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*** Bug 109806 has been marked as a duplicate of this bug. ***