Dual-head config broke with update to 1.4.2

Alex Deucher alexdeucher at gmail.com
Mon Feb 15 08:27:39 PST 2010

On Mon, Feb 15, 2010 at 11:14 AM, Martin Cracauer <cracauer at cons.org> wrote:
> Alex Deucher wrote on Mon, Feb 15, 2010 at 10:52:44AM -0500:
>> On Sun, Feb 14, 2010 at 6:51 PM, Martin Cracauer <cracauer at cons.org> wrote:
>> > I have a Thinkpad T41 with an internal LCD and a VGA out, using an
>> > older Radeon chip and the radeon Xorg driver. ?I have a display at the
>> > VGA out and have configured dual-head via ServerLayout. ?This broke
>> > with an update to Xorg 1.4.2.
>> >
>> > Short version:
>> > - I seem to select the wrong output between LVDS (LCD), VGA, DVI and
>> > ?TV. ?Instead of LVDS and VGA and I seem to get the (non-existent)
>> > ?DVI and VGA. ?As a result, when X11 is up it seems that screen-0
>> > ?disappeared and screen-1 (VGA) is now DISPLAY=:0.0. ?There is no
>> > ?:0.1.
> [...]
>> Your best bet is to switch to using xrandr to configure your card:
>> http://wiki.debian.org/XStrikeForce/HowToRandR12
>> It will let you dynamically switch between single and multi-head.
> No, that doesn't work for me.  I need classic dualhead with separate
> $DISPLAY so that I have separate virtual desktop switching on each.
> I have seen that this works fine for the same Xorg version on other
> computers not using the Radeon/ATI driver.
> So I reported it to the ATI driver list (assuming my subscription went
> through).

If you want to keep using zaphod mode, your best bet it to continue
using the old version of the driver.  New features like support for
more than two outputs cause problems with zaphod mode.


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