ubuntu-x-swat team mailing list archive

[Chris B <billington.chris@xxxxxxxxx>]

Public bug reported:

Binary package hint: xserver-xorg-video-intel

With the following Intel controller on Jaunty/9.01:

00:02.0 VGA compatible controller [0300]: Intel Corporation Mobile
915GM/GMS/910GML Express Graphics Controller [8086:2592] (rev 03)

And updated kernel as recommended in http://ubuntuforums.org/showthread.php?t=1130582
Linux presto 2.6.30-02063003-generic #02063003 SMP Sat Jul 25 10:57:13 UTC 2009 i686 GNU/Linux

Intel driver from PPA https://launchpad.net/~ubuntu-x-swat/+archive/x-updates/
Package: xserver-xorg-video-intel
Architecture: i386
Version: 2:2.7.1-0ubuntu1~xup~1

xorg.conf
Section "Device"
 Identifier "Configured Video Device"
 Driver "intel"
 Option "AccelMethod" "exa"
 Option "EXAOptimizeMigration" "true"
 Option "MigrationHeuristic" "greedy"
 Option "Tiling" "true"

I got the following results:

PPracer, fullscreen 1280*800: UXA 11-15fps, EXA 25-30fps
Fullscreen flash noticeably worse with UXA (tearing, dropped frames)

The same ratio results (UXA giving about half frame rate and worse 2D video performance than EXA) was noted with the 2.4 Intel driver from Intrepid, Jaunty stock 2.6.3 driver, and the X-updates 2.7.1 driver. Performance with the downgraded 2.4 driver was noticeably worse (EXA). Upgrading from stock 2.6.28.15 kernel to 2.6.30 gave about a 20% improvement in framerate on ppracer.
--------
RETESTED WITH LATEST VERSIONS
xorg-edgers PPA intel driver
Intel driver Version: 2:2.8.0+git20090814.926c7e7d-0ubuntu0sarvatt~jaunty
2.6.30-02063005-generic

00:02.0 VGA compatible controller [0300]: Intel Corporation Mobile
915GM/GMS/910GML Express Graphics Controller [8086:2592] (rev 03)

Due to the 2.8.0 driver EXA is no longer available, so UXA is used whatever is in the config file:
(WW) intel(0): Option "AccelMethod" is not used #new comment line in Xorg.0/log

Unfortunately, I can't confirm William Grant's test results on Karmic,
above.

With this combination (tested both with and without kernel modesetting)
the framerate in ppracer is cut to 11-14fps, and fullscreen video is
choppy. This is roughly what was achieved with 2.6.3 or 2.7.1 drivers
with UXA, and is about half the EXA framerate.

It seems this degradation does not apply to all Intel chipsets, since
https://wiki.ubuntu.com/X/UxaTesting has users reporting improved
performance.

ProblemType: Bug
Architecture: i386
DistroRelease: Ubuntu 9.04
Package: xserver-xorg-video-intel 2:2.8.0+git20090814.926c7e7d-0ubuntu0sarvatt~jaunty
ProcEnviron:
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
ProcVersion: Linux version 2.6.30-02063005-generic (root@zinc) (gcc version 4.2.3 (Ubuntu 4.2.3-2ubuntu7)) #02063005 SMP Mon Aug 17 10:27:38 UTC 2009
SourcePackage: xserver-xorg-video-intel
Uname: Linux 2.6.30-02063005-generic i686
UnreportableReason: This is not a genuine Ubuntu package

** Affects: xserver-xorg-video-intel (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-bug i386

-- 
(UXA) xserver-xorg-video-intel 2D and 3D performance is much reduced from EXA
https://bugs.launchpad.net/bugs/416604
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