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Old 04-19-09, 11:50 AM   #9
mulder77
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Join Date: Jul 2008
Posts: 20
Default Re: 8200 (IGP) based motherboards not suitable for VDPAU?

Quote:
Originally Posted by Dragoran View Post
VDPAU seems not to let the driver change the performance level like opengl does.
You can force the card to run at a higher performance level by adding


To /etc/modprobe.conf and reboot.

But the fact that it does not change the performance level when required is a driver bug that should be fixed.
Unfortunately this doesn't seem to be the real problem.
I played around a bit and tried to set the 8200 to the performance mode by adding similar options to the xorg.conf as you suggested.

But both, adding options to xorg.conf or to modprobe.conf didn't help.

I noticed that glxgears uses up to 100% cputime (around 1700 fps).
glxinfo states that direct rendering is available.

So, I tested the following situations:

- glxgears running, CPU @2600 MHz:
Video playback is totally smooth, no framedrops

- glxgears running, CPU @1000 MHz:
Video playback at 16 fps, framedrops

- no glxgears, CPU @2600 MHz:
Video playback nearly smooth, very few problems

- no glxgears, CPU @1000 MHz:
Video playback at 16 fps, framedrops

Well, I think, the problems occur due to timing problems.
When playing back some HD files, cpu usage of XBMC never is higher than roughly 10%. So VDPAU is doing it's job...


Any hint is very welcome!
Markus
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