Comment # 6 on bug 1186365 from Andrei Borzenkov

(In reply to Fabian Vogt from comment #5)
> Sounds like the display manager (or maybe X itself) selects the wrong VT.

Any idea why it happens with virgl only?

10:~ # cat /sys/class/drm/card0-Virtual-1/{enabled,status}
enabled
connected
10:~ # lsof /dev/tty7
lsof: WARNING: can't stat() fuse.gvfsd-fuse file system /run/user/1000/gvfs
      Output information may be incomplete.
COMMAND  PID USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
X       1279 root   12u   CHR    4,7      0t0   26 /dev/tty7
10:~ # loginctl show-session 1
Id=1
User=1000
Name=bor
Timestamp=Tue 2022-06-21 19:08:57 MSK
TimestampMonotonic=31869120
VTNr=7
Seat=seat0
Display=:0
Remote=no
Service=lightdm-autologin
Desktop=xfce
Scope=session-1.scope
Leader=1284
Audit=1
Type=x11
Class=user
Active=yes
State=active
IdleHint=no
IdleSinceHint=0
IdleSinceHintMonotonic=0
LockedHint=no
10:~ # ps -ef | grep X
root      1279  1267  0 19:08 tty7     00:00:02 /usr/bin/X :0 -seat seat0 -auth
/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch

Nothing suspicious in Xorg.log either.