I can reproduce this issue using:
xrandr --output DP1 --auto --primary --output LVDS1 --off
With 3.8.0-17-generic and drm-intel-next (3.9.0-997) after plugging in an
external monitor.
Perhaps this is a different issue than the one reported on freedesktop.
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https://bugs.launchpad.net/bugs/1157678
Title:
unplugging an external monitor from laptop results in corrupted
screen. Logging out fixes it.
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