[Nouveau] [Bug 34554] Nouveau seems to have corrupted my laptop screen's EDID info

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=34554

--- Comment #6 from Thibaut GIRKA <thib at sitedethib.com> 2011-02-24 15:24:27 PST ---
Created an attachment (id=43772)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=43772)
Xorg logs with blob

I've tried the nvidia blob, and as expected it kept failing (see
Xorg.0.log.blob) until I passed it the "fixed" EDID info using the "CustomEDID"
option.

I've made sure the EDID is loaded from I2C (and not VBIOS or anything else) by
adding a few debug statements.

I've also figured out exactly why "new" DRM doesn't fix the header: it doesn't
check the whole record in one go, and tries to determine whether the current
block is the first by checking the first byte.
In my case, the first byte is wrong (0x1a instead of 0x00), so, it doesn't get
corrected.
I've modified the code and forced the first byte (of the whole EDID data) to 0
so I can use my laptop's screen with 2.6.37-1.

Running linux 2.6.37-1 again, I've had 3 different bad EDID reports, but I
haven't found a way to reproduce it yet.

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