Disable stretching in ATI driver

[Alex Deucher]

On 10/24/06, Benjamin Herrenschmidt <benh at kernel.crashing.org> wrote:
> On Mon, 2006-10-23 at 19:54 +0200, Klaus Reimer wrote:
> > Alex Deucher wrote:
> > > There have been patches floating around to disable RMX but nothing has
> > > ever been applied.  You should just be able to comment out the the
> > > setting of the RADEON_USE_RMX flag in the mode validation.  If I have
> > > time this week I'll commit something to git.
> >
> > Thanks. I tried that but the result is not that nice. The 1024x768
> > screen is now displayed in the  upper left corner of the 1280x800
> > screen, but that's ok.
>
> The chip has ways to do auto-centering but I haven't quite figured out
> how to properly program that. Also, we don't need/want to completely
> disable RMX. What we want is an option to maintain the aspect ratio or
> not (nvidia binary has that I think) and best if we can toggle that
> option at runtime (using Xv attributes maybe ? We lack a proper way to
> toggle things like that, unless Keith new RandR++ adds arbitrary
> attributes ?). Also we should probably default to maintaining the aspec
> ratio. That is, we calculate the RMX factors based on the smallest of
> the H and V factors and we center the resulting image.
>

randr++ has the capability to handle scalers.

Alex

> What MacOS does is that it exposes 2 sets of modes, scaled and scaled
> with aspect ratio (at least it used to, I haven't checked on recent
> MacOSes) but I'd rather have a toggle attribute than doing that.
>
> Ben.
>
>
>