[Bug 89815] DRI3 and EXA: scrambled output when switching monitors

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89815

--- Comment #4 from Harald Judt <h.judt at gmx.at> ---
(In reply to Michel Dänzer from comment #1)
> Please attach /var/log/Xorg.0.log and the output of dmesg, preferably from
> after the problem occurred.

There is nothing strange in dmesg.

The image looks scrambled and is frozen, yet slightly reminiscent of the
original screen.

> What does "switching monitors" mean exactly?

this:
    xrandr --output DVI-1 --auto --primary --output HDMI-0 --off
    xrandr -s 1360x768

or:
    xrandr --output HDMI-0 --auto --primary --output DVI-1 --off


Screen 0: minimum 320 x 200, current 1920 x 1200, maximum 16384 x 16384
HDMI-0 connected primary 1920x1200+0+0 (normal left inverted right x axis y
axis) 550mm x 344mm
   1920x1200     59.95*+
   1920x1080     60.00    59.94    59.93  
   1920x1080i    60.00    59.94  
   1600x1200     60.00  
   1680x1050     59.88  
   1280x1024     75.02    60.02  
   1440x900      59.90  
   1152x864      75.00  
   1280x720      60.00    59.94  
   1024x768      75.08    70.07    60.00  
   1440x480i     59.94  
   832x624       74.55  
   800x600       72.19    75.00    60.32    56.25  
   720x576       50.00  
   720x576i      50.00  
   720x480       60.00    59.94  
   720x480i      60.00    59.94  
   640x480       75.00    72.81    66.67    60.00    59.94  
   720x400       70.08  
   640x400       59.95  
DisplayPort-0 disconnected (normal left inverted right x axis y axis)
DisplayPort-1 disconnected (normal left inverted right x axis y axis)
DVI-0 disconnected (normal left inverted right x axis y axis)
DVI-1 connected (normal left inverted right x axis y axis)
   1920x1200     60.00 +
   1360x768      60.02 +
   1280x1024     75.02    60.02  
   1280x768      59.87  
   1024x768      75.08    70.07    60.00  
   800x600       72.19    75.00    60.32    56.25  
   640x480       75.00    72.81    60.00  
   720x400       70.08  


Also, a similar issue occurs even with glamour + dri3 (and maybe exa + dri2
etc., but I haven't tested this) for:

xrandr --fb 3840x1200 --output HDMI-0 --mode 1920x1200 --scale-from 3840x1200
--output DVI-1 --off

And the scaling does not work. It recognizes the fb change (the panel pager
reflects this), but the scaling does not change. I've filed a bug for this some
time ago, though things have changed a bit since then:
https://bugs.freedesktop.org/show_bug.cgi?id=80678

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