[Bug 8938] [ATI/radeon] Xv tearing

bugzilla-daemon at annarchy.freedesktop.org bugzilla-daemon at annarchy.freedesktop.org
Fri Dec 1 02:25:51 PST 2006

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------- Additional Comments From sroland at tungstengraphics.com  2006-12-01 02:25 -------
(In reply to comment #27)
> I recently changed motherboards on this machine, and the problem was on both.
> The previous board was an Intel based (unsure exactly which chipset), and the
> new is a VIA VT82-something.
Ok if it happened with both that probably isn't the issue.

> > The card could be problematic, there exist versions with
> > only 64bit sdr ram, while in theory those 10MB/s you need to upload the video
> > aren't really much things tend to fall apart with those cards if they are too
> > bandwidth-limited.
> > 
> This is a Radeon 7000, which according to wikipedia is one with only 64-bits for
> the memory bus.
Sure but most of them have ddr sdram and not sdr. The log should tell you that.

> Also, DRI is disabled here.
Well, writing fb shouldn't be that slow without dma (though reading sure is).

> > > C. Why am I getting tearing when I have XV_DOUBLE_BUFFER set to 1? Shouldn't
> > > there be a cache of at least one image on the card that we flip to?
> > Not sure. Looks like it shouldn't happen. Maybe a frame could be completely
> > missed so you'd upload a new frame to the current buffer.
> Any way to determine what's going on here?
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