[ubuntu-x] DRi2 intel drivers in Jaunty?

Peter Clifton pcjc2 at cam.ac.uk
Fri Jan 23 18:18:14 GMT 2009

On Fri, 2009-01-23 at 20:13 +0200, Timo Aaltonen wrote:
> On Fri, 23 Jan 2009, Peter Clifton wrote:
> > Hi guys..
> >
> > I was just about to write an email asking if there were any plans to get
> > the 2.6.x intel driver into Jaunty, with / without DRI2 support, and it
> > turns out the packages hit the repositories about 3 hours ago ;).
> :)
> > What this does mean.. is that you might start to see some reports of
> > corrupt alpha rendering with compiz. (I've been testing locally with the
> > new intel drivers for a while now.. and have been debugging that issue).
> Is this with UXA? I haven't seen any corruption so far on my X61 which has 
> 965GM, but using the default which is EXA. I know there are some problems 
> with UXA but haven't tried it out at all yet.

Sure. I wasn't aware EXA was the released default, I am indeed using
UXA. I've got a GM45, but the driver code-paths should be the same.

> > I'll keep prodding to see if the DRI2 tfp implementation can be fixed,
> > but if not.. give me a shout, and I'm sure we'll be able to come up with
> > some patches for the Ubuntu compiz packages which will hide the problem
> > from users in 99.9% of the cases with intel + DRI2.
> Thanks for looking into it, especially if it turns out to be a major 
> issue for us.

Fingers crossed.

There is always EXA, but that's not particularly fast. I tried UXA, but
killing DRI2 - which worked, but was also slow (from recollection, I
don't think the tfp implementation hit a zero-copy code-path).

I'm not sure if DRI2 is required for proper UXA support or not.

Best wishes,

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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