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[madbiologist <s.j.turner@xxxxxxxxx>]

There is a patch upstream in kernel 2.6.35-rc1 which may help you.  From
the changelog:

commit 61e57a8d72f2336faf39b5d940215cf085e01e6e
Author: Adam Jackson
Date:   Mon Mar 29 21:43:18 2010 +0000

    drm/edid: Fix secondary block fetch.
    
    This makes fetching the second EDID block on HDMI monitors actually
    work.  DDC can't transfer more than 128 bytes at a time.  Also,
    rearrange the code so the pure DDC bits are separate from block parse.
    
    Signed-off-by: Adam Jackson
    Signed-off-by: Dave Airlie

Unfortunately this has not been cc'd to the stable kernel branch.

Note that kernel 2.6.35-rc1 currently has a major performance
regression, which will hopefully be fixed in 2.6.35-rc2.

-- 
The EDID for BenQ V2400W (DFP-1) contradicts itself: mode
https://bugs.launchpad.net/bugs/585776
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