[Bug 109610] New: i915 xorg display corruption on ctrl-alt-F3

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=109610

            Bug ID: 109610
           Summary: i915 xorg display corruption on ctrl-alt-F3
           Product: xorg
           Version: unspecified
          Hardware: Other
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/intel
          Assignee: chris at chris-wilson.co.uk
          Reporter: lui at fgcint.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org

Created attachment 143362
  --> https://bugs.freedesktop.org/attachment.cgi?id=143362&action=edit
Corrupted image on ctrl-alt-F3

System boots normally for kernel 4.20.
I have several systems
1) ASUS mother board with a Pentium CPU (3-5 years old)
2) Gigabyte Z370M-D3H LGA1151-CL Mother board with I5 CPU (1-2 years old)
3) MSI B360M Gaming Plus DDR4 Turbo M2 LGA1151 Mother board with I5 CPU
(several months old)
4) MSI H310M PRO-VD LGA1151 Mother board with I3 CPU (weeks old)

ASUS does not show the problem while the other three do.
Disk drive is the same one so image is identical.

It has been suggest the i915 is the issue.

If I have ctrl-alt-F1 with the graphical login screen
ctrl-alt-F2 is a logged in session
ctrl-alt-F3 is the character based login. This is the screen display with the
problem visible on it.

Swap from F1<->F3 100% looks OK
Swap F1<->F2 100% OK (always was and never had an issue)
Swap F2<->F3 and my problem is there.
Do F2->F3 (problem there) do F3->F1->F3 problem not there
Or do F2->F1->F3 problem not there.
It fixes up the display if I go through the F1 (graphical login) screen.

Also something I have noticed is that when I swap out of F2 for a moment the
screen goes silly in the top left with the graphical data and F3 does not clear
it but F1 seams to clear it out.

My guess is the swap screen code is writing the data out (maybe only as
temporary buffer) and F1 (as an initialization code) clear that temporary area
out) and that is what is happening and why F1 fixes it.

I tried various things to do with xorg/wayland etc (I was doing my tests wrong)
and this is what I have finally found.

Some more testing:
with /etc/gdm/custom.conf having these lines in the daamon section
[daemon]
WaylandEnable=true
DefaultSession=gnome-xorg.desktop

and selecting from the login cog either "gnome classic" or "gnome on xorg" it
continues to fail.
If you choose "gnome" (which I had not done before) it appears to be OK.
Certainly the ways I was doing before to make it fail does not appear to fail.
I have rebooted etc and behaviour does not change.

The reasons I like "gnome classic" is the pull down "Applications" menus and
also the "minimize, full screen etc" at the top of the active window, also the
small icon display of all the windows on the screen is nice. Can anyone say if
there is anyway I can get that with new gnome version (I think not).

Happy to do any tests (config etc) people suggest (I don't build kernels and
code though).

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