[Nouveau] Monitor with corrupted EDID

[Flavio Castelli]

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?

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