According to the changelog, this might be fixed upstream in kernel
2.6.36-rc1:
commit 351a52a2414d2b104269755c86b476863c248034
Author: Alex Deucher
Date: Wed Jun 30 11:52:50 2010 -0400
drm/radeon/kms: add ioport register access
This is required for the NB_MISC regs on rs780/rs880 which
means HDMI/DVI/DP ports using PCIEPHY won't work without
it. It might also help with s/r (asic init) issues on other
atombios cards.
Fixes:
https://bugs.freedesktop.org/show_bug.cgi?id=28774
and similar issues reported by Alberto Milone.
[airlied: Squash io fix patch]
Signed-off-by: Alex Deucher
Tested-by: Rafał Miłecki
Signed-off-by: Dave Airlie
A PPA of this kernel is available at http://kernel.ubuntu.com/~kernel-
ppa/mainline/
** Bug watch added: freedesktop.org Bugzilla #28774
http://bugs.freedesktop.org/show_bug.cgi?id=28774
--
radeon HD 4200 HDMI not works
https://bugs.launchpad.net/bugs/605097
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