[ubuntu-x] -intel 2.6.3 uploaded

Peter Clifton pcjc2 at cam.ac.uk
Mon Mar 23 21:49:38 GMT 2009

On Mon, 2009-03-23 at 13:12 -0700, Bryce Harrington wrote:
> For those of you who have tested UXA, now that -intel 2.6.3 has been in
> the archive a few days, what are your thoughts on it compared with the
> default EXA?

I no longer have any serious problems. I can't use sync to vblank with
compiz though. If that is enabled, compiz only updates the screen once
every few seconds. I've not had time to test if this is related to the
Ubuntu specific patch which disables vblank in mesa.

With mesa from the Xorg edgers PPA, I'm not seeing any compiz
transparency corruptions either. (Which is strange, because as far as I
can make out, the commit which is supposed to fix that isn't included in
the package!) I've not had time to debug what might have fixed the

At one point in the jaunty cycle, my graphics FPS and performance jumped
and was really good. Shortly after it dropped back to the usual level
and I wasn't able to figure out why.

I noted this blog post today:


And it seems that the cpufreq governer being broken causes low fps / 3D
performance. I seem to recall some kernel fixes in Jaunty to reinstate
the ondemand governor. Perhaps my brief spell with no proper CPU
governor corresponded to the increased FPS.

(Setting the "performance" governor rather than "ondemand" pushes my
"not a benchmark" glxgears numbers from about 560fps to about 880fps.)

Peter Clifton

Electrical Engineering Division,
Engineering Department,
University of Cambridge,
9, JJ Thomson Avenue,

Tel: +44 (0)7729 980173 - (No signal in the lab!)

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