On i915kms, vt(4) is shown to have corruption as per the attached image in the top left of the display resulting in some unreadable text.
Steps to replicate:
As a regular user, run startx
Press Alt-Ctrl-F? to switch to a tty
Corruption is seen on top left of the display.
This issue can be intermittent and also affects 12.0 RELEASE on the same system.
Machine is Lenovo T480 with integrated graphics from Intel.
Created attachment 201884 [details]
Corruption to vt under i915kms after switching from xserver
I can confirm that this only occurs when switching from X server to tty without shutting down X first.
If X server is shut down, when the switch to the tty occurs, any corruption is now gone.
Also, if the corruption persists due to X server being shut down forceably i.e. through kill etc., restarting X and then shutting it down gracefully prevents the corruption from being displayed when it X server terminates.
It should be noted that no corruption is ever seen when the tty is switched to the active X server.