i915: disable DAC on Ironlake also when doing CRT load detection.
Dave Airlie authored

Like on Sandybridge, disabling the DAC here when doing CRT load detect
avoids forever hangs waiting on the hardware.

test procedure on HP 2740p:
boot with no VGA plugged in, start X,
plug in VGA monitor (1280x1024)
chvt 3
machine hangs waiting forever.
Signed-off-by: default avatarDave Airlie <airlied@redhat.com>
Signed-off-by: default avatarEric Anholt <eric@anholt.net>
d5dd96cb