nv 2.1.x: why no acceleration with RandR rotation enabled and screen not rotated?

[Giuseppe Bilotta]

On 9/25/07, Alex Deucher <alexdeucher at gmail.com> wrote:
> On 9/25/07, Giuseppe Bilotta <giuseppe.bilotta at gmail.com> wrote:

> > Just for kicks I tried something very stupid (i.e. removing the line
> > that sets NoAccel when RandR rotation is enabled). No spectular crash,
> > but there seem to be serious framebuffer problems (large black botches
> > all across the screen) even when the screen isn't rotated. I'll see if
> > I can nail exactly what's going wrong.
>
> It may have to do with tiling or some special FB format required for
> acceleration.

I've done some more testing. Apparently the problem is that enabling
RandR rotation means all rendering is done through the shadow FB,
which is not accelerated.

Ok, mistery solved 8)


-- 
Giuseppe "Oblomov" Bilotta