[Bug 109668] ctrl-alt-f2 + alt-f1 always crashes X server

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=109668

Jan Kratochvil <jan.kratochvil at redhat.com> changed:

           What    |Removed                     |Added
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                 CC|                            |jan.kratochvil at redhat.com

--- Comment #10 from Jan Kratochvil <jan.kratochvil at redhat.com> ---
Created attachment 144426
  --> https://bugs.freedesktop.org/attachment.cgi?id=144426&action=edit
xorg-x11-server-1.20.4-1.fc29 patch

xorg-x11-server-1.20.4-1.fc29 patch although it is equivalent to what the
libdrm patch 143401 does - ignore any errors from drmModeAtomicCommit().

I can confirm it is unrelated to docking station.  When I removed the docking
station (connected to LG 27UK650 (Xorg.log id "LG HDR 4K") by DisplayPort) and
connected the display directly to Lenovo X1 Carbon HDMI port it did behaved the
same.

Besides ctrl-alt-Fx switching consoles the problem also happens after DPMS Off
(xlock -dpmsoff), I have changed it now to DPMS Suspend (xlock -dpmssuspend)
and it looks as the locked up display does not happen anymore.

With this patch screen remains black and one can recover it by disconnecting
and reconnected the display (after resuming from DPMS Off); the same can be
done by disconnecting+reconnecting the docking station (or powercycling the
docking station).

I have also updated main BIOS of Lenovo X1 Carbon to 1.38 now, no effect (it
even appears to me it happens more often than with 1.34 before).

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