This bug was fixed in the package mesa - 7.11-0ubuntu1

---------------
mesa (7.11-0ubuntu1) oneiric; urgency=low

  * Fake merge from Debian experimental, updating previous changelog entries.
    New upstream release fixes infrequent X crash (LP: #800778).
    Remaining Ubuntu changes:
   - debian/control
      + Drop lesstif-dev from Build-Depends; it's in Universe.
      + Comment out GLw libs since it depends on lesstif-dev.
      + Drop i686 swx11 libgl package.
      + Add libdrm-dev to mesa-common-dev Depends.
      + Drop libwayland-dev from Build-Depends; it's in Universe.
      + Update Breaks for Ubuntu versions
      + Enable llvm on armel as well as i386 and amd64
    - debian/rules
      + Use --disable-glw for swx11 targets too.
      + Don't enable motif for swx11 targets.
      + Use lzma compression for binary debs to save CD space.
      + Drop unloved mach64 driver.
      + Use --enable-shared-dricore to claw back CD space.
      + Enable llvmpipe software rasteriser.
      + Enable llvm on armel as well as i386 and amd64
    - debian/patches
      + 100_no_abi_tag.patch
      + 101_ubuntu_hidden_glname.patch
      + 103_savage-expose_fbmodes_with_nonzero_alpha.patch
    - rules, libgl1-mesa-{glx,dev,swx11,swx11-dev}.install.in,
      libgl1-mesa-{glx,swx11}.{postinst,prerm}.in, libgl1-mesa-dev.links.in:
      Install libGL.so* in /usr/lib/mesa to allow things to work with
      alternatives.
    - debian/not-installed:
      + Drop i686 files; we don't build 686-optimised packages in the first
        place.
    - debian/gbp.conf
      + Point at Ubuntu branch to make git-buildpackage less narky.
    - 113_fix_tls.diff: Fix crashes in unrelated code due to TLS usage.
    - debian/patches/111_export_searchdirs_in_dripc.diff:
      + Add drisearchdirs variable to dri.pc so the Xserver can pick up the
        alternate DRI driver dirs.
    - debian/patches/115_llvm_dynamic_linking.diff
      + Dynamically link DRI drivers to libllvm.  Saves ~6MiB per DRI driver.
    - debian/patches/116_use_shared_galliumcore.diff:
    - debian/libgl1-mesa-dri.install.in:
      + Link gallium DRI drivers against shared gallium routines to save CD
        space.
  * debian/rules:
  * debian/libgl1-mesa-dri-experimental.install.{i386,amd64}.in
    - Explicitly install i915g only when it has been built, matching what is
      done with r300g.
  * debian/rules:
  * debian/control:
  * debian/libegl1-mesa{,-dev}.install.in:
  * debian/libegl1-mesa.symbols:
    - Enable the Wayland EGL backend.
  * debian/rules:
  * debian/libegl1-mesa.{postinst,prerm,install}.in:
  * debian/libegl1-mesa-dev.{install,links}.in:
  * debian/libgles{1,2}-mesa.install.in:
  * debian/libgles{1,2}-mesa-dev.links.in:
  * debian/libopenvg1-mesa{,-dev}.install.in:
  * debian/libopenvg1-mesa-dev.links.in:
    - Use alternatives for libEGL to match the handling of libGL.
      libEGL (and associated GL|ES and OpenVG libraries) now live in
      /usr/lib/$MULTIARCH/mesa-egl.  (LP: #812639)
  * debian/patches/118_fix_24bpp_software_rendering.diff:
    - Cherry pick upstream patch from master fixing graphical corruption when
      using a 24bpp framebuffer and software rendering. (LP: #810339)
  * debian/rules:
  * debian/clean:
    - Generate xmlpool pot file and clean up other po files for
      pkgbinarymangler's benefit (LP: #410264).
  * debian/patches/119_r600g_gnome_shell_rendering_fix.diff:
    - Cherry pick upstream commit fixing rendering corruption in gnome-shell
      (and therefore likely Unity as well).
 -- Christopher James Halse Rogers <email address hidden>   Thu, 04 Aug 2011 16:25:08 +1000