[Intel-gfx] [PATCH 6/6] drm/i915: fix VGA detect on IGDNG

[Zhenyu Wang]

On 2009.07.28 09:40:15 -0700, Keith Packard wrote:
> On Tue, 2009-07-28 at 15:11 +0800, Zhenyu Wang wrote:
> 
> > This introduces screen flicker which is bad, more testing takes
> > me to below patch. Force detection on IGDNG desktop chip seems
> > doesn't require disable DAC first, but mobile chip has trouble
> > with that, so I just fallback to DDC probe instead. Any comment?
> 
> We can't require DDC on VGA; monitor switches often do not pass DDC
> along. The only reliable way to detect VGA monitors is load detection.

Ok.

> 
> Does the IGDNG have a reliable interrupt for VGA hotplug?
> 

Force detection for VGA is reliable after DAC is disabled first.
I haven't added display hotplug interrupts handling on IGDNG yet, 
so will check out this later.

-- 
Open Source Technology Center, Intel ltd.

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