Documented at
<https://wiki.ubuntu.com/JauntyJackalope/ReleaseNotes#Performance
regressions on Intel graphics cards>:
"Users of Intel video chipsets have reported performance regressions in
Ubuntu 8.10 compared with previous releases (bug 252094). Many of the
issues have been resolved in Ubuntu 9.04, but some remain.
* Some users have found improved performance by using the "greedy" migration
heuristic. This can be done by running "sudo gedit /etc/X11/xorg.conf", and
adding Option "MigrationHeuristic" "greedy" to the Device section of your
xorg.conf.
* Alternately, a new experimental acceleration architecture option,
"DRI2/UXA", is available for Intel graphics users which our testing has found
provides significant performance improvements in some cases, but has also shown
risk of severe stability problems. You can opt-in to enable this by running
"sudo gedit /etc/X11/xorg.conf", and adding Option "AccelMethod" "UXA" to the
Device section of your xorg.conf. Users wishing to maximize stability should
stay with the standard default acceleration method, "EXA".
* If none of the above helps, some users reported success with using an older
driver version."
There will be further refinements of the text (in particular, to warn
that UXA may make X unusable on some systems), but I think the current
text covers this issue. If you think more is needed, please reopen the
release notes task.
** Changed in: ubuntu-release-notes
Status: New => Fix Released
--
[i945] Unusable with Intel 945GM/GMS, 943/940GML [8086:27a2] (rev 03)
https://bugs.launchpad.net/bugs/359818
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