945GM(E) screen rotation and slow GL.

[Rob Kramer]

Keith Packard wrote:
> On Wed, 2009-01-14 at 09:51 +0800, Rob Kramer wrote:
> 
>> When testing screen rotation to portrait mode, the glxgears framerate
>> drops from 51 fps (not too great to start with) to 1 fps.
> 
> Thanks! We lost our rotation acceleration when we switched to dri_bo's
> for pixmaps.

Cool, thanks. That's a lot better at 18 fps, but still a lot worse than
normal landscape operation. Is that expected? I thought with modern GL
setups, rotation basically came for free -- but I'm a GL newbie :)

Do you think the 945 chipset is just too slow to rotate a 1920x1200 screen?

Cheers!

   Rob