[Intel-gfx] [PATCH] drm/i915/crt: Only support DPMS On/Off with the PCH registers

Chris Wilson chris at chris-wilson.co.uk
Tue Apr 10 16:12:35 CEST 2012

On Tue, 10 Apr 2012 09:20:38 -0400, Adam Jackson <ajax at redhat.com> wrote:
> On 4/10/12 4:35 AM, Chris Wilson wrote:
> > As part of the PCH split, the ability to control CRT standby/suspend
> > states was defeatured; the bits are now marked reserved and apparently
> > have no effect.
> Are the intermediate states even tested?  I have vague memories of them 
> not working.  I'd be just as happy to see them aliased to Off.

All I can say is that QA reported that ILK+ suspend/standby did not work
with an external VGA monitor. However, that doesn't say whether or not
they ever tested earlier generations if it took a few years to spot the
behavioural regression.

Chris Wilson, Intel Open Source Technology Centre

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