No video overlay on Intel X4500HD

[Barry Scott]

Keith Packard wrote:
> On Wed, 2009-01-14 at 19:35 +0000, Daniel Gultsch wrote:
>   
>> Hi Guys,
>>
>> My major problem is that i dont have the "Intel(R) Video Overlay" but
>> only the "Intel(R) Textured Video" - as reported by xvinfo | grep -i
>> adaptor. This causes tearing and i really need to watch movies :-)
>>     
>
> The textured adapter causes tearing because it doesn't synchronize the
> screen update to the vblank. Synchronizing this operation involves
> either:
>      A. queuing a command to stop the graphics engine until the vblank
>         interval and then queuing the rendering commands right after
>         that. 
>      B. waiting for the vblank interval to occur and then quickly
>         queueing suitable rendering commands to the graphics engine
>
>   
Or change the client to wait for VBLANK before calling XPutImage.
(Only works if the movie player is the only client waiting on VBLANK
because of trade offs in the Intel DRM code).

Barry