[mythtv-users] fps drops with DRM sync and bob

[Hamish Moffatt]

On Sun, Jun 10, 2007 at 01:26:37AM +1000, Hamish Moffatt wrote:
> On Sat, Jun 09, 2007 at 10:30:30AM -0400, Doug Larrick wrote:
> > The 965G does not have video overlay hardware and instead uses OpenGL
> > textured video; if you can find a driver option for this on your
> > hardware it may be worth trying.
> 
> xvinfo reports:
> 
> mythtv at moocher:~$ xvinfo -display :0 | grep Adapt
>   Adaptor #0: "Intel(R) Textured Video"
>   Adaptor #1: "Intel(R) Video Overlay"
> 
> and mythfrontend reports that it is using the textured video adapter. 

oprofile detects that the CPU time is being used by a function called
I830WaitLpRing(), which is called from I830Sync(). It isn't immediately
obvious what would cause this.

On a whim, I disabled the textured video adapter (by hacking the
source). This has solved the problem! 

I have watched half an hour of recordings with bob and it worked 
perfectly. Not only has the excessive CPU usage (and resulting dropped
frames) gone but so has the vertical shimmer.

Next is to post to the xorg list to track down the cause.


Success at last. Thanks for sticking with me.

Hamish
-- 
Hamish Moffatt VK3SB <hamish at debian.org> <hamish at cloud.net.au>