linux-kernel - Re: GMA500 support

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Message-ID: <20111124212318.0ba3beb8@lxorguk.ukuu.org.uk>
Date:	Thu, 24 Nov 2011 21:23:18 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Kristoffer Ericson <kristoffer.ericson@...il.com>
Cc:	Patrik Jakobsson <patrik.r.jakobsson@...il.com>,
	linux-kernel@...r.kernel.org, greg@...ah.com
Subject: Re: GMA500 support

On Thu, 24 Nov 2011 17:20:14 +0100
Kristoffer Ericson <kristoffer.ericson@...il.com> wrote:

> It works for me, however if external display is connected it defaults to 1024x768 (as patrik
> pointed out). The internal screen gets mirrored and therefore looses about 600x768 pixels (which look like
> memory garbage). 

That sounds like a bug in the internal screen set up. In mirrorred mode
picking 1024x768 is reasonable enough but it ought to be centreing and/or
scaling the display.

> > Worth pointing out is that DDC for external displays isn't working until my
> > fixes for SDVO gets in there. Manually setting a mode works fine. Otherwise
> > you'll default to 1280x1024 (or was it 1024x768?).

> Im not able to set any resolution at all for the external screen, its always 1024x768.
> I cannot be 100% sure that its not my external screen not accepting the 1600x768 resolution
> and they therefor find the largest compatible resolution.

See above 8)

> > > - 2D hardware acceleration except console scrolling (as it seems to be
> > >  too slow to be useful). I may add some 2D bits later where they do help
> > >  (eg back to front blitting may be worth it just about)
> > > - 3D engine (no public documentation)
> 
> Can any parts of the i915 be used?

Alas not

Alan
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