linux-kernel - Re: [PATCH] retrieve VBE EDID/DDC info independent of used video mode

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Date:	Fri, 03 Aug 2007 11:33:49 +0800
From:	"Antonino A. Daplas" <adaplas@...il.com>
To:	Daniel Drake <dsd@...too.org>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	Zwane Mwaikambo <zwane@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jan Beulich <jbeulich@...ell.com>,
	linux-kernel@...r.kernel.org, Andi Kleen <ak@...e.de>
Subject: Re: [PATCH] retrieve VBE EDID/DDC info independent of used video
	mode

On Thu, 2007-08-02 at 22:33 -0400, Daniel Drake wrote:
> Antonino A. Daplas wrote:
> > How about this patch?
> > 
> > Tony
> > ---
> > 
> > Subject: video setup: Fix VBE DDC reading
> > 
> > Add memory operand constraint and write-only modifier to the inline
> > assembly to effect the writing of the EDID block to boot_params.edid_info.
> 
> 
> Thanks, this patch works in that Linux now reports the correct resolution.
> 
> However, the TV output is now scrambled...

The previous problem was just a display shift of 6 pixels, correct?  If
the display is now scrambled, then this is a new problem.

> I suspect this might be a result of adding CONFIG_FRAMEBUFFER_CONSOLE in 
> the most recent tests.

It's useless to unset CONFIG_FRAMEBUFFER_CONSOLE to 'n', he'll just end
up with a 640x400 stretched or windowed display.

Can he...

1. describe what 'scrambled' means?
2. Boot with video=intelfb:accel=0,<old options>?
3. post the output of 'fbset -i' and the latest dmesg?
4. change the color depth ('fbset -depth 16')?
5. If possible, run X using 'fbdev' as the driver at 16 bpp
   (I don't think 32 bpp works with X-fbdev)?

Tony

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