Re: i5 & i7 auto graphics switching
Re: i5 & i7 auto graphics switching
- Subject: Re: i5 & i7 auto graphics switching
- From: Stephane Madrau <email@hidden>
- Date: Mon, 13 Sep 2010 10:39:39 +0200
2010/9/12 <email@hidden>
> When it is running on the slow card, the CGDirectDisplayID will be x, and on
> the fast card it will be y. Is there anyway to derive x from y or y from x?
> I am trying to be able to uniquely identify screens even before/after a
> processor switch.
Given a CGDirectDisplayID, you can use
IORegistryEntryCreateCFProperties to get the display properties. In
the returned CFDictionary, the value associated with the
IODisplayPrefsKey remains the same before/after any GPU switch.
I don't know if this is documented anywhere, it's just the result of
my observations.
--
Stéphane
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