[Bug 370231] Re: Unbearably slow full-screen video playback, Compiz disabled, extremely slow and jumpy backward scrolling in FireFox presumably due to absents of proprietary drivers for Intel Corporation Mobile 945GM/GMS, 943/940GML Express Integrated Graphics Controller

[Geir Ove Myhr]

I am not aware of any proprietary driver for -intel.  Intel is releasing
the source for their driver, and this is included in Ubuntu.

As for the performance problems, you may be seeing bug 349992 or bug 357290. Take a look at those two bugs, and if you think it is not one of them, look at 
https://wiki.ubuntu.com/X/Reporting and https://wiki.ubuntu.com/X/Troubleshooting/IntelPerformance for what to include in this bug report. Especially, a bug is not considered complete before it has /var/log/Xorg.0.log and the output of `lspci -vvnn` attached to it.

Have you tried to changing "EXA" to "UXA" in your xorg.conf?

** Changed in: xserver-xorg-video-intel (Ubuntu)
       Status: New => Incomplete

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Unbearably slow full-screen video playback, Compiz disabled, extremely slow and jumpy backward scrolling in FireFox presumably due to absents of proprietary drivers for Intel Corporation Mobile 945GM/GMS, 943/940GML Express Integrated Graphics Controller
https://bugs.launchpad.net/bugs/370231
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