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

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Date:	Wed, 01 Aug 2007 23:50:23 -0400
From:	"H. Peter Anvin" <hpa@...or.com>
To:	"Antonino A. Daplas" <adaplas@...il.com>
CC:	Daniel Drake <dsd@...too.org>,
	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

Antonino A. Daplas wrote:
> On Wed, 2007-08-01 at 09:54 +0800, Antonino A. Daplas wrote:
>> On Tue, 2007-07-31 at 21:17 -0400, Daniel Drake wrote:
>>> Zwane Mwaikambo wrote:
>>>> Sorry if this has been hashed out before, but could you point me towards 
>>>> the gentoo bugzilla entry? I'm trying to understand how your setup broke. 
>>>> Which version VBE does your system have?
>>> Here's the bug:
>>> http://bugs.gentoo.org/show_bug.cgi?id=181067
>>>
>> Looking at the dmesg output of the working and failing kernel, it does
>> seem that there's no EDID block available in the failing kernel.
>>
> 
> BTW, I looked at the above bug report, it seems his last dmesg does not
> have fbcon enabled.  Make sure that CONFIG_FRAMEBUFFER_CONSOLE=y before
> doing more tests (the problem of lack of the EDID block in the failing
> kernel still applies).
> 

Okay, I'm royally puzzled why that would be.  I've gone over the code 
quite a few times, and I do not see any way (other than VESA < 2.0) that 
could cause that.

I look forward to getting the debug output; depending on what it is we 
might have to get some debugging output from the setup code.

We can printf in the new setup code, although obviously that requires 
leaving the screen in text mode.  However, EDID information should still 
be available.

	-hpa

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