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

Giuseppe Bilotta giuseppe.bilotta at gmail.com
Tue Sep 25 07:13:32 PDT 2007

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

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