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

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Date:	Wed, 01 Aug 2007 09:04:54 +0800
From:	"Antonino A. Daplas" <adaplas@...il.com>
To:	Daniel Drake <dsd@...too.org>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jan Beulich <jbeulich@...ell.com>,
	linux-kernel@...r.kernel.org, zwane@...radead.org,
	Andi Kleen <ak@...e.de>
Subject: Re: [PATCH] retrieve VBE EDID/DDC info independent of used video
	mode

On Tue, 2007-07-31 at 19:58 -0400, Daniel Drake wrote:
> Hi,
> 
> H. Peter Anvin wrote:
> >> So, 2.6.22-rc6-mm1 should work fine with CONFIG_FIRMWARE_EDID=y, or are
> >> further patches needed?
> >>
> > 
> > It should, yes.
> 
> It didn't work, and the bug still exists in 2.6.23-rc1: the resolution 
> is wrong by 6 pixels. The user does have CONFIG_FIRMWARE_EDID enabled.
> 
> So far the only known working setups since 2.6.20.11 are:
>   1. Zwane's patch reverted
>   2. Jan's patch applied (to 2.6.22 or lower, I guess it no longer works 
> for 2.6.23)
> 
> Here is dmesg output from 2.6.23:
> http://bugs.gentoo.org/attachment.cgi?id=126203&action=view
> 

The dmesg ouput did show that intelfb was not able to acquire the EDID
from the BIOS, even if CONFIG_FIRMWARE_EDID=y I presume.  I don't think
it's the VBE version, the chipset is an Intel 830 which should at least
be a VBE 2.0.

Is it the same for the working kernel?  Do you have a link to the dmesg
ouput of a working kernel, if possible with #define DEBUG in
drivers/video/fbmon.c.  The output of read-edid or /var/log/X?.log will
also be helpful.

Tony 


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