[Bug 25884] xine-ui's on-screen display triggers KMS errors with r100 and rv280

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=25884





--- Comment #30 from Alex Deucher <agd5f at yahoo.com>  2010-03-21 10:31:19 PST ---
(In reply to comment #29)
> (In reply to comment #28)
> > None of the ddx accel code (EXA, Xv) tracks 3D state which would be needed to
> > solve this properly.
> 
> Interestingly, I've also noticed that sometimes the "struct
> radeon_renderbuffer" is either NULL or incorrect in Mesa R300's
> emit_zb_offset() function. (This is with KMS enabled.) Could it just be a
> coincidence that both textured video and Mesa are complaining about bad/missing
> z buffers now?
> 

They are unrelated.  The command check just makes sure the zbuffer is valid. 
In the mesa case there's a bug in either mesa or the 3d driver that causes the
depth buffer pointer to be incorrect.  This results in a command buffer with an
invalid z buffer which the CS checker flags.  In the ddx, when we flush in the
Xv drawing code, the new command buffer is missing the 3D state that was set
earlier in the function, so the CS checker flags it as well.  two different
bugs that result in the same drm error.


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