Intel GM956 performance regression in 11.10?

Marius Gedminas marius at
Mon Jan 16 19:19:05 UTC 2012

On Mon, Jan 16, 2012 at 05:47:48PM +0200, Ioannis Vranos wrote:
> On Mon, Jan 16, 2012 at 5:16 PM, Marius Gedminas <marius at> wrote:
> > On Fri, Jan 13, 2012 at 06:27:06PM +0200, Marius Gedminas wrote:
> >> Has anyone else noticed a considerable performance regression in Intel
> >> GM956 graphics after an upgrade from 11.04 to 11.10?
> >>
> >> When I drag terminal windows around on my screen the position updates at
> >> what feels like ~6 fps. The compiz workspace sliding animation on
> >> Ctrl+Alt+Left/Right sometimes drops *all* the intermediate frames. I can
> >> sometimes see *tearing* when I'm scrolling text in less in a
> >> gnome-terminal!
> >
> > A reboot fixes this and Compiz animations/application updates feel fast
> > again.
> >
> > What could possibly cause a gradual slowdown of graphics?
> It may be a graphics card overheating problem.

I do not think rebooting would make it suddenly cooler, would it?

> Is there available the GPU temperature?

Maybe.  Judging from the fan speed overheating was not a problem.

> It may also be a driver bug. After checking the GPU temperature, try
> using the latest driver.

Do you mean xserver-xorg-video-intel, or the kernel bits, or the Mesa
bits?  Is there a PPA with newer driver versions for oneiric?

I wish there was a way to reproduce this faster than by using the laptop
for a week after each boot.

Marius Gedminas
What goes up, must come down. Ask any system administrator.
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