Dual-head config broke with update to 1.4.2

Martin Cracauer cracauer at cons.org
Mon Feb 15 14:24:01 PST 2010

Alex Deucher wrote on Mon, Feb 15, 2010 at 11:27:39AM -0500: 
> 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.

But I don't want more than two outputs.

All I want is my working pre-1.4.x setup with internal LCD and VGA
back.  I hope this is a misunderstanding.  I don't want any new
feature.  Just my two old outputs just the way they were until I
upgraded Xorg.

In case this is actually broken now, can I use an old driver in the
1.4.x Xorg server or do I have to downgrade the whole server?

In general I am a bit surprised that you dismiss non-xrandr dual-head
so easily.  Apart from the fact that it worked until recently with
your ATI driver and continues to work with other card's drivers the
model of work and setup is entirely different between classic
dual-head with two screens and xrandr.  There's no easy way for me to
switch to any single-display dual-screen setup.

Martin Cracauer <cracauer at cons.org>   http://www.cons.org/cracauer/
FreeBSD - where you want to go, today.      http://www.freebsd.org/

More information about the xorg mailing list