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[madbiologist <603861@xxxxxxxxxxxxxxxxxx>]

This might be fixed upstream in kernel 2.6.35-rc6. From the changelog:

commit 15cb02c0a0338ee724bf23e31c7c410ecbffeeba
Author: Alex Deucher
Date:   Wed Jul 21 19:37:21 2010 -0400

    drm/radeon/kms: fix legacy LVDS dpms sequence
    
    Add delay after turning off the LVDS encoder.
    
    Fixes:
    https://bugzilla.kernel.org/show_bug.cgi?id=16389
    
    Tested-by: Jan Kreuzer
    Signed-off-by: Alex Deucher
    Cc: stable@xxxxxxxxxx
    Signed-off-by: Dave Airlie

A PPA of this kernel is available at http://kernel.ubuntu.com/~kernel-
ppa/mainline/


** Bug watch added: Linux Kernel Bug Tracker #16389
   http://bugzilla.kernel.org/show_bug.cgi?id=16389

-- 
(ATI Mobility Radeon X700) White screen on resolutions 1024x768 and lower while KMS is enabled
https://bugs.launchpad.net/bugs/603861
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