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xserver woes (ATI Radeon) after upgrade to xorg 1.7.4



Hi,

I use two monitors with an ATI Radeon HD 4850 card on an amd64 system.
I had this configured and running since last October using the
proprietary ATI driver I downloaded myself.

After upgrading (I run Debian/unstable) a few days ago, this broke.

At first, the system came up in "screen clone" mode, rather than
extending the desktop across both monitors.  I tried a few things with
xorg.conf, eventually running "dpkg-reconfigure -phigh xserver-xorg"
which results in a tiny config:

    Section "Device"
        Identifier      "Configured Video Device"
    EndSection

This made things worse (no graphics) so I finally removed the
proprietary driver and reinstalled all xorg packages.  Now I
do have graphics again.

However, I still cannot get the desktop extended across both monitors.
I can either get one monitor or a clone mode, but xrandr fails this
command:

    $ xrandr --output DVI-0 --left-of DVI-1
    xrandr: screen cannot be larger than 2048x1600 (desired size 3200x1200)

(Each monitor runs in 1600x1200 resolution)

Has anyone run into this and solved it?



I also fiddled around with installing the newest version of
the proprietary drivers, but it requires 32-bit versions of
libGL and such.  I didn't find these in the archive -- am I
just overlooking them?

Thanks,
-Steve

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