On Thu, 2010-08-05 at 11:53 +1000, Dave Airlie wrote: > So I've been reviewing the i915/ironlake CRT detect code and am a bit > confused. > > I though on the i945 and above that we had proper CRT hotplug > detection with an IRQ, that didn't require any polling. > > Now looking at the code when we do a CRT detect, the first thing we do > is try the hotplug method, however on ILK/SNB this is crap and > requires powering off the ADPA, which turns off the monitor, if that > fails we fallback to DDC probing which is pretty non-destructive. > > I get the feeling the whole hotplug detect code is pointless if the > hardware is already meant to send us an IRQ when something happens,
Yeah, same. The bit about GM45 needing to do it twice in a row is probably the only exception. - ajax
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