Radeon driver in 1.4 breaks dualhead on Thinkpad with RV250

[Alex Deucher]

On Mon, Feb 15, 2010 at 5:26 PM, Martin Cracauer <cracauer at cons.org> wrote:
> Alex Deucher wrote on Mon, Feb 15, 2010 at 11:47:47AM -0500:
>> On Mon, Feb 15, 2010 at 11:10 AM, Martin Cracauer <cracauer at cons.org> wrote:
>> > I previously reported this to the general Xorg list, but since then I
>> > checked that things work normally with other X11 servers of the same
>> > version and no ATI driver, so I thought I re-post here.
>> >
>> > Basically, when I went and updated my RV250 equipped Thinkpad to Xorg
>> > 1.4.2 (from what identifies itself as 7.0.0), the internal LCD refuses
>> > to work in dual-head with the VGA output. ?From the Xorg.0.log output
>> > it looks like the Radeon/ATI driver incorrectly assumes it's talking
>> > to DVI, not LVDS.
>> >
>> > Cross-checking with the output when starting just the LCD
>> > single-headed (which works fine) I see what I think is confirmation,
>> > in that in that case RADEON(0) properly iterates through LVDS,
>> > S-video, DVI and VGA-0.
>> >
>> > In the dual-head config the driver insist on only trying DVI (the
>> > computer doesn't have a DVI output plug) and subsequently only comes
>> > up with a single screen, on the VGA, and the LCD stays blank.
>> >
>>
>> The DVI port is on the docking station.  This is the problem with
>> zaphod mode, it assumes one connector per screen but when the system
>> has 4 connectors which ones do you associate with the each zaphod
>> instance?
>
> My question is simply how do I select one for each screen?
>

You can't right now.  The zaphod code just grabs the first two
connectors and assigns one to each instance of the driver.
Someone supposedly wrote a patch to allow for the selection of the
output for zaphod, but it hasn't been posted yet.

Alex

> I tried everything in xorg.conf that looked like I can associate
> outputs with screens.
>
> But it never changed anything about the end result, which is the first
> screen just disappeared and I only got the VGA output.
>
> Martin
> --
> %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
> Martin Cracauer <cracauer at cons.org>   http://www.cons.org/cracauer/
> FreeBSD - where you want to go, today.      http://www.freebsd.org/
>