Bug#546671: Seeing similar with "einstein"

[Simon Waters]

The Einstein puzzle package uses SDL 1.2

If I run it in fullscreen on my desktop machine, the display is frequently 
(but not always) messed up on exit.

It can be reset with either KDE screen controls or xrandr

The onboard graphics has two outputs (DVI and VGA), the situation seems 
improved/fixed if I disable the second with this command.

$ xrandr --output VGA-0 --off

Obviously this is a works for me whilst I only have one monitor plugged in.

$ xrandr 
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 16384 x 16384
DVI-0 connected primary 1920x1080+0+0 (normal left inverted right x axis y 
axis) 521mm x 293mm
   1920x1080     60.00*+
   1680x1050     59.88  
   1280x1024     75.02    60.02  
   1440x900      74.98    59.90  
   1280x960      60.00  
   1152x864      75.00  
   1024x768      75.03    70.07    60.00  
   832x624       74.55  
   800x600       72.19    75.00    60.32    56.25  
   640x480       75.00    72.81    66.67    59.94  
   720x400       70.08  
VGA-0 disconnected (normal left inverted right x axis y axis)

I got similar behaviour from trivially small test program. So confident this is 
libsdl1.2. Couldn't find a small code change that fixed Einstein but I'm 
learning SDL as I go, although it might be possible to scale in a resizeable 
window, since I doubt many people are running 800x600 only.

Will try SDL_VIDEO_FULLSCREEN_HEAD=0 environment variable when it recurs.