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: sta...@kernel.org
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
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White screen at boot and system locks up
https://bugs.launchpad.net/bugs/544582
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