compositor-drm: Force DPMS state to ON after drmModeSetCrtc()

The kernel is supposed to set this when drmModeSetCrtc() is called but
at least the i915 driver wouldn't do that in all cases. A fix for this
should be released with kernel 3.10, but we work around the issue in
older kernels by always forcing DPMS to ON when doing a mode set.

https://bugs.freedesktop.org/show_bug.cgi?id=64873
1 file changed