[mythtv-users] Openchrome XvMC problems in mythfrontend

Peter Holmes pholmes at india.com
Thu May 28 22:07:37 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?
>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.

Could you provide information about the change you made. I would like to try this 
to see if it fixes my problem (see [mythtv-users] Video Jerky on a Epic Via Sp8000 board)

P. Holmes

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