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Old 05-27-09, 03:30 AM   #1
jyavenard
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Default Problem with 9800GT and VDPAU

Hi

Trying to help someone getting his 9800GT to work with VDPAU.

And I haven't had much luck..

I've identified the issue to be related to the speed the card is running at.
GPU is at 300Mhz by default and Video RAM is at 100MHz

In the default mode, H264 720p video decoding is very sketchy in MythTV, 1080i is even worse.

Running glxinfo at the same time, change the speed to 600MHz / 900MHz and at that speed, playback with VDPAU is fine...

Now, the problem is that as soon as I stop glxinfo, the clock goes back to 300 / 100Mhz...

Video drivers is 180.60.

Any ideas on a work around ?

Thank you
Jean-Yves
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Old 05-27-09, 04:07 AM   #2
thefirstm
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Default Re: Problem with 9800GT and VDPAU

There was another thread about this a while back. The devs said they were looking into a fix, but I haven't read anything else. I do have a recommendation, though. If possible, try disabling Composite by adding this:

Section "Extensions"
Option "Composite" "disable"
EndSection

to the xorg .conf. This is a dirty workaround, but evidently the overlay output method (used when Composite is off) is much less GPU-intensive than the Blit output method (used when it is on.) This workaround does not affect the clock-speed of the GPU, but it does enable my 8600m GT to decode SD MPEG2 or H264 video smoothly. I will test HD in a minute.
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Old 05-27-09, 04:18 AM   #3
jyavenard
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Default Re: Problem with 9800GT and VDPAU

Disabling Composite has nothing to do with my problem.

First, composite is already disabled and second, disabling composite is only required to prevent tearing.

The issue I'm reporting here is that the nvidia GPU is set at a too low frequency and running VDPAU doesn't raise the clock speed sufficiently.

I've played with some settings like:
Option "RegistryDwords" "PowerMizerLevelAC=0x1"

in the device section, it does start playing properly.. But after a few minutes, video playback becomes choppy again...
The speed of the video card becomes 600 (GPU) / 900Mhz (RAM) with the 0x1 settings
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Old 05-27-09, 04:33 AM   #4
thefirstm
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Default Re: Problem with 9800GT and VDPAU

Have you tried the latest beta driver version? This might help the issue as well.
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Old 05-27-09, 05:25 AM   #5
jyavenard
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Default Re: Problem with 9800GT and VDPAU

I just tried with the latest beta 185.18.10

It is a tad better, but after about 2 minutes , it becomes all jerky again ...
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Old 05-27-09, 11:08 AM   #6
Stephen Warren
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Default Re: Problem with 9800GT and VDPAU

This is probably a known issue with PowerMizer. We believe we've fixed it, and should be in a driver fairly soon.
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Old 05-27-09, 09:21 PM   #7
jyavenard
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Default Re: Problem with 9800GT and VDPAU

Does the new 185.18.14 RC drivers have such fix ?
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Old 05-27-09, 10:40 PM   #8
Stephen Warren
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Default Re: Problem with 9800GT and VDPAU

Yes, it's the "VDPAU/PowerMizer interaction" entry in the changelog.
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Old 05-28-09, 12:40 AM   #9
jyavenard
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Default Re: Problem with 9800GT and VDPAU

Excellent. I will try it.

I may build my mythtv packages against 185 drivers from now on...

Jean-Yves
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