We don't want to try to vblank synchronize to monitors which are off.
In order to handle that properly, we need to know the CRTC's DPMS mode.
Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Keith Packard <keithp@keithp.com>
Tested-by: Jason Ekstrand <jason.ekstrand@intel.com>
Signed-off-by: Keith Packard <keithp@keithp.com>
8affaade2c