[mythtv-users] OpenGL render problems with radeon and 0.24.1

[John King]

I'm having problems with myth playback using the OpenGL renderer and
the radeon Xorg driver.  Basically it looks like the mythtv video
playback is displaying one frame, but then a stale buffer is displayed
the next frame.  I uploaded a YouTube video of what's going on:

http://www.youtube.com/watch?v=KM824VcdMDs

Audio is fine, and it appears that the framerate is fine too.

I have the MythTV GUI painter set up to use OpenGL, and it looks like
a stale GUI background image is being displayed on the alternate (i.e.
non-video) frames.  And then when the video finishes playing, the GUI
is messed up too - it seems as though the stale buffer is sometimes
showing up there.  But the problem still happens even if I switch the
GUI painter back to Qt.  In that case I get a mostly black stale frame
with the text "Please Wait..." on it - which is what gets displayed
just before the video starts.

Is this some sort of OpenGL page flip problem?

Also on a hunch, I disabled the Xorg Composite extension (both in the
"Extensions" section in xorg.conf as well as setting ExaNoComposite
"false"), but that didn't help.

Setup details:

Debian Unstable
Radeon 3300 integrated graphics
No deinterlace filters
Using Xorg radeon driver (not fglrx)
metacity window manager - not compiz, no desktop effects enabled but I
used to run compiz so maybe there's something still going on there?
MythTV 0.24.1 from debian-multimedia packages - but I am willing/able
to download and compile myth from source if necessary

I couldn't find any info searching the wiki or the list
archives, but hopefully this is something that other people have run
into.  I haven't tried fglrx (and don't want to switch).  Playback
using XV is fine.  I will paste xorg.conf, glxinfo, and mythfrontend
-v playback output in another post (message size limits are getting me
on this first one).

Thanks,
John