http://bugzilla.novell.com/show_bug.cgi?id=449083
User sndirsch@novell.com added comment
http://bugzilla.novell.com/show_bug.cgi?id=449083#c34
--- Comment #34 from Stefan Dirsch 2009-04-23 06:51:45 MDT ---
I could reproduce the issue when using the the DVI onboard output connected to
the DVI input of a TFT monitor. It's fixed with latest git version of the
driver. I git bisected it and figured out that it has been fixed by the
following commit.
commit 4dbdeea7c9316575fba26b41fd347452e42cdcf2
Author: Alex Deucher
Date: Fri Aug 8 17:39:48 2008 -0400
Further cleanup and unification of i2c code
- unify the ddc and i2c code
- add gpio mask support for legacy chips
- remove the magic gpio dance for ancient monitors
(if you have an ancient monitor that ddc stops
working on let me know). This should speed up DDC
on legacy chips.
-- radeon sw gpio i2c --
4 sets of gpio registers for clk and data and corresponding bit masks
mask - locks the gpio for use by sw
get - reads the value off the gpio pad
put - sets the gpio direction to output
a - "other stuff" On legacy chips you clear them if you want
to use a gpio for i2c. In some cases they are used for the
output value when the gpio in the output state.
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