From mboxrd@z Thu Jan  1 00:00:00 1970
From: Marcin Slusarz <marcin.slusarz-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Subject: Re: Monitor with corrupted EDID
Date: Thu, 7 Feb 2013 20:34:20 +0100
Message-ID: <20130207193420.GA3181@joi.lan>
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To: Flavio Castelli <flavio-2uVk4PVEUg6lnMjI0IkVqw@public.gmane.org>
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On Thu, Feb 07, 2013 at 04:16:54PM +0100, Flavio Castelli wrote:
> For an unknown reason both my monitors ended up with a corrupted EDID.
> They both provide VGA and DVI input. The VGA input works fine, while
> DVI is broken because of the EDID issue.
> 
> Using these [1] instructions I have been able to read the EDID and fix
> it. Unfortunately I'm not able to write it back to the eeprom.
> I always get this message:
>   i2c i2c-1: sendbytes: NAK bailout.
> 
> This is what I usually see in /var/log/message
> [dump of the EDID]
> nouveau 0000:01:00.0: DVI-D-1: EDID block 0 invalid.
> [drm] nouveau 0000:01:00.0: DDC responded, but no EDID for DVI-D-1
> 
> Do you know why writing to the monitor does not work? I suspect the
> eeprom is write protected
> 
> Googling a bit I noticed the nvidia driver allows to ignore the EDID
> returned by the monitor and use a custom one. I looks like the nouveau
> drivers do not offer this feature. Am I wrong?

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=blob;f=Documentation/EDID/HOWTO.txt

> 
> These are my specs:
>   * kernel: 3.4.11-2.16-desktop
>   * architecture: x86_64
>   * distribution: openSUSE 12.2
>   * xorg-x11-driver-video-nouveau-0.0.16_20120321_ab7291d-3.5.1.x86_64
>   * X.Org X Server 1.12.3
>   * NVIDIA Corporation G84M [Quadro FX 570M]
>   * Monitor 1: lenovo l220x wide
>   * Monitor 2: lenovo l2440p
> 
> 
> What should I do?
> 
> Thanks in advance
> Flavio