[mythtv-users] Jerky video & prebuffering pause messages with MergedFB multi-screen setup

[Gee, David]

Hi,

I have a dual-head setup using the DVI and VGA outputs on my ATI Radeon
9200SE video card. Xorg is set up to use the "radeon" driver, and it
uses the driver's MergedFB option for the dual-headedness, because I
understand it's better than the generic Xorg multi-head capabilities
(and also I couldn't get the Xorg native stuff to work). Anyway, when I
attempt to play TV through Myth, it's very jerky (like 1 second of
audio/video, then a few seconds pause, etc.), and the console outputs
the following stuff.

2006-06-05 18:58:21.037 TV: Changing from None to WatchingLiveTV
2006-06-05 18:58:21.058 Realtime priority would require SUID as root.
2006-06-05 18:58:21.133 Video timing method: DRM
2006-06-05 18:58:24.240 NVP: prebuffering pause
2006-06-05 18:58:27.329 NVP: prebuffering pause
2006-06-05 18:58:30.431 NVP: prebuffering pause
2006-06-05 18:58:31.032 New DB connection, total: 3
2006-06-05 18:58:31.041 Connected to database 'mythconverg' at host:
localhost
2006-06-05 18:58:31.961 rebuffering (7221 32768)
2006-06-05 18:58:32.101 rebuffering (19993 32768)
2006-06-05 18:58:33.629 NVP: prebuffering pause
2006-06-05 18:58:33.873 rebuffering (19901 32768)
2006-06-05 18:58:34.333 rebuffering (1549 32768)
2006-06-05 18:58:37.026 NVP: prebuffering pause
2006-06-05 18:58:40.123 NVP: prebuffering pause
2006-06-05 18:58:42.936 TV: Attempting to change from WatchingLiveTV to None
2006-06-05 18:58:43.230 TV: Changing from WatchingLiveTV to None
2006-06-05 18:58:43.242 Enable DPMS

This never used to happen when I was running in single head mode and I'm
not quite sure what to do to fix it so I'd appreciate some suggestions.
I'm running the latest version of Myth and the ivtv drivers, and I have
a Hauppauge WinTV PVR 150 PAL TV card.

Thanks in advance

Regards
David Gee