[Bug 28328] Unable to configure ATI x1200 in a dual-head configuration

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Tue Jun 1 23:56:11 PDT 2010


--- Comment #26 from Alex Deucher <agd5f at yahoo.com> 2010-06-01 23:56:11 PDT ---
(In reply to comment #25)
> I pulled out the add-on card, and tried configuring a dual-head setup on the
> onboard card. I failed ;) Could you please take a look at
> xrandr-verbose.out[1of2]  and Xorg.0.log_1of2. When the system turns on or
> boots the monitor connected to DVI-1 remains blank. If I boot Embedded XP it
> turns the DVI1 output on...

Since it's an embedded board, I suspect the i2c lines used for DDC are not
connected to anything or they use some hardcoded mapping rather than what is
specified in the bios tables which is what causes DDC to fail resulting in the
driver not being able to detect any attached monitors.  On newer xservers you
can force the monitors on by adding the relevent sync ranges and modelines to
the monitor sections and setting the enable option in the monitor sections,
e.g., Option "Enable" True"

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