[mythtv-users] Openchrome XvMC problems in mythfrontend

Paul Bender pebender at san.rr.com
Mon May 18 20:35:43 UTC 2009


Ronald Pijnacker wrote:
> Hi all,
> 
> This week I tried to upgrade my mythfrontend to mythbuntu jaunty.
> Running mythfrontend gives an error about not being able to create an XvMC Surface.
> The hardware I'm running on is a VIA EPIA M1000, the bug report can be found here:
> 
> https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-openchrome/+bug/371512
> 
> Initially I filed a bug report under the openchrome video driver, but after
> a suggestion from the openchrome irc group, I ran xine with XvMC enabled.
> This worked without any problems.
> So the question now is, why I'm running into problems with mythtv. Any ideas?
> 
> Ronald
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> mythtv-users at mythtv.org
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As a quick hack, I modified the udev rules so that udev renames 
/dev/dri/card0 to /dev/dri/card1, which causes MythTV ot not use DRM 
vblank. Instead it uses usleep with busy wait. After that, no more stutter.

Therefore, it appears that the problem is with DRM vblank. However, I do 
not know whether this is a bug in DRM or in MythTV.


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