Cannot enable desktop effects if desktop wider than 2048

[Hegh]

Binary package hint: gnome-control-center

I am unable to turn on both multiple-monitors and desktop effects at the same time. I can either have desktop effects turned on while having my two monitors mirrored, or I can have an extended desktop across the two monitors but be unable to turn on desktop effects. If I turn on desktop effects and then change my monitor configuration from mirrored to side-by-side, the display is messed up until I restore my previous settings.

Graphics card (from lspci): VGA compatible controller: ATI Technologies Inc R430 [Radeon X800 XL] (PCIe)
Driver: radeon
Monitors: Both Samsung 19" SyncMaster 931B, optimal resolution 1280x1024

This is reproducible.

ProblemType: Bug
Architecture: amd64
Date: Thu Nov 5 08:23:30 2009
DistroRelease: Ubuntu 9.10
ExecutablePath: /usr/bin/gnome-appearance-properties
Package: gnome-control-center 1:2.28.1-0ubuntu1
ProcEnviron:
 SHELL=/bin/bash
 LANG=en_US.UTF-8
ProcVersionSignature: Ubuntu 2.6.31-14.48-generic
SourcePackage: gnome-control-center
Uname: Linux 2.6.31-14-generic x86_64

[Travis Watkins (amaranth)]

That's because 1280x2 is 2560 which is larger than 2048, the maximum texture size your video card supports. Technically it should be possible for your video driver to work around this limitation but it needs changes in the X server as well (the "shatter" extension).

[Hegh (celloman)]

Is the "shatter" extension available? How might I test whether that works?

[Bryce Harrington (bryce)]

[This is an automatic notification.]

Hi Hegh,

This bug was reported against an earlier version of Ubuntu, can you
test if it still occurs on Lucid?

Please note we also provide technical support for older versions of
Ubuntu, but not in the bug tracker. Instead, to raise the issue through
normal support channels, please see:

    http://www.ubuntu.com/support

If you are the original reporter and can still reproduce the issue on
Lucid, please run the following command to refresh the report:

  apport-collect 475381

If you are not the original reporter, please file a new bug report, so
we can work with you as the original reporter instead (you can reference
bug 475381 in your report if you think it may be related):

  ubuntu-bug xorg

If by chance you can no longer reproduce the issue on Lucid or if you
feel it is no longer relevant, please mark the bug report 'Fix Released'
or 'Invalid' as appropriate, at the following URL:

  https://bugs.launchpad.net/ubuntu/+bug/475381

[Bryce Harrington (bryce)]

We're closing this bug since it is has been some time with no response from the original reporter. However, if the issue still exists please feel free to reopen with the requested information. Also, if you could, please test against the latest development version of Ubuntu, since this confirms the bug is one we may be able to pass upstream for help.