the x200 i’m using has enough omph to power OpenGL on both the builtin display and the 1600×1200 external display. unfortunately whenever i moved that glxgears window on to the second screen it would just show…nothing. googling around for that showed that a number of people had the same problem but nobody had found a solution.
repeated staring at the intel(4) man pages resulted in the hunch to try and switch from EXA acceleration to XAA acceleration
Section "Device"
Identifier "intel"
Driver "intel"
Option "monitor-VGA" "VGA"
Option "monitor-LVDS" "LVDS"
Option "AccelMethod" "XAA"
EndSection
an X server restart later, and, voilá!, glxgears shows its gears on
screen 2. problem solved.
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