xf86-video-ati page flipping fixes

[Mario Kleiner]

On May 5, 2011, at 4:23 PM, Ville Syrjälä wrote:

> On Thu, May 05, 2011 at 11:46:45AM +0200, Michel Dänzer wrote:
>> On Mit, 2011-05-04 at 23:51 +0300, Ville Syrjala wrote:
>>> I came to the conclusion that the xserver DRI2 invalidate patches  
>>> that
>>> have been discussed aren't really fixing the problem. I suppose  
>>> they may
>>> make the problem slightly less likely to happen, but at least for  
>>> me that
>>> likelyhood is still very high. The whole mess looks like a simple  
>>> driver
>>> bug to me.
>>
>> I think the xserver patches are still necessary, otherwise how are  
>> the
>> cached DRI2 pPriv->buffers updated for other windows sharing the same
>> pixmap?
>
> As the real front buffers are not handed out to clients, there isn't
> that much reason to update them. Making sure the fake front buffer
> contain a more recent snapshot of the real front would be one reason
> though.
>

Could it be that your patch fixes a closely related, but different  
bug? During OpenGL rendering, Mesa/Gallium caches the backbuffer  
assignment and only queries the current assignment from the x-server  
if its drawable has been invalidated, which is what the x-server  
patches do.

I'd also think you will need both patch sets.

-mario