Comment 342 for bug 252094

When I try to enable UXA, startx just freezes during startup.

I have also noticed, when I run glxgears, it says "Failed to initialize
GEM." Could this because I am using the 2.6.28 *server* version of the
kernel?

On Sun, Apr 12, 2009 at 3:44 PM, andrehsiqueira <email address hidden>wrote:

> On my notebook Toshiba U205 S5034 - with Intel VGA compatible
> controller: Intel Corporation Mobile 945GM/GMS, 943/940GML Express
> Integrated Graphics Controller (rev 03), I fix the performance issue by
> a change into xorg.conf:
>
> Section "Device"
> Identifier "Configured Video Device"
>
> # It turns off disabling pipa A by a driver after while.
> # Its 100 % working workaround.
> Option "ForceEnablePipeA" "true"
>
> # restore COMPIZ performance
> Option "AccelMethod" "UXA"
>
> # Option "FramebufferCompression" "off"
> EndSection
>
> --
> MASTER: Poor graphics performance on Intel
> https://bugs.launchpad.net/bugs/252094
> You received this bug notification because you are a direct subscriber
> of the bug.
>
> Status in X.org xf86-video-intel: Confirmed
> Status in “linux” source package in Ubuntu: New
> Status in “xserver-xorg-video-intel” source package in Ubuntu: In Progress
>
> Bug description:
> I experience significant performance loss with ubuntu 8.10 alpha 3 with my
> Intel DG965WH based system and SVDO/ADD2 video card. Actually, the
> performance loss started with ubuntu 8.04.1; I upgraded to see if there was
> any performance gain with the new version. While "glxgears" produced values
> between 1580 fps and 1496 fps with ubuntu 7.04 and 7.10, respectively, now I
> can only achieve something like 445 fps with ubuntu 8.10 alpha 3. I get an
> error message when starting glxgears that "TTM" was not available and
> classic mode would be used. Similary, the flight simulator "flightgear"
> achieves frames rates of 1-2 fps only.
> My suspicion is that some of the hardware acceleration features of the
> X3000 system are not being used, and I don't know how to activate them with
> the new xorg.conf structure and the underlying automatic configuration
> approach.
> I would like to see the graphics performance go back to the values achieved
> in ubuntu 7.04 and 7.10.
> Your help / comment is greatly appreciated.
> Bingo
>
> [Update]
> Intel upstream has been in a multi-year effort to rearchitect X and the
> Intel 2D and 3D driver to provide better performance. While this work is
> underway, people are seeing variations in performance levels from version to
> version, for a variety of reasons. There are probably multiple unrelated
> bugs being reported in the comments here.
>
> It is important to note and remember that glxgears is *not* a benchmark
> tool. It simply measures how fast the driver writes images to the screen,
> whereas most 3D applications are limited by render speed, not merely blit
> speed. Instead use a 3D game (flightgear, tremulous, etc.) that has a real
> rendering workload to make comparisons.
>
> If you're definitely seeing performance problems and are able to narrow it
> to a specific cause, please do not comment onto this bug report - it's too
> lengthy and rambling already, and your issue will just be lost in the noise.
> Instead, make a new report and please be as specific as possible with exact
> steps to reproduce and as much detail and logs as you can. See
> http://wiki.ubuntu.com/X/Reporting for tips on making a good X bug report.
>
> A troubleshooting guide, with additional background about performance
> issues on Intel is available at:
>
> https://wiki.ubuntu.com/X/Troubleshooting/IntelPerformance
>