Comment 187 for bug 182038

From xserver-xorg-core update on Ubuntu Hardy Heron:

Version 2:1.4.1~git20080131-1ubuntu8:

  * debian/patches/165_fedora_xserver-1.5.0-xaa-option-inversion.patch:
    - Turn XAA Offscreen Pixmaps off by default, and use
      XaaOffscreenPixmaps "true" to turn them on. This setting was an
      early pre-EXA HW optimization attempt that didn't pan out; upstream is
      deprecating XAA in favor of EXA generally, and for situations where
      XAA is still in use recommends NOT using this optimization hack, since
      they found it often just made performance worse, and sometimes created
      visualization bugs. People wishing to gain added performance should be
      experimenting with EXA anyway, not this setting. (closes LP: #182038)