radeon/r128 patches

[Alex Deucher]

On Thu, 23 Dec 2004 15:07:55 -0600, David Stanaway <david at stanaway.net> wrote:
> On Thu, 2004-12-23 at 09:35 +0100, Benjamin Herrenschmidt wrote:
> > On Tue, 2004-12-21 at 14:35 -0500, Alex Deucher wrote:
> >
> > > > My eyes are actually better off at 1280x1024 anyway, and the scale is
> > > > more comparable with 1152x768 on the LCD anyway so it is no biggy. It
> > > > could just be the monitor (I will see if it repeats with my Sony E500 at
> > > > work).
> > >
> > > It may be a bandwidth issue.  the mobility r128 perhaps can't quite
> > > drive the display at that resolution or maybe the vga port hardware
> > > wasn't designed to handle it.  Can MacOS handle it?
> >
> > Either that, or it is a problem with the setting of the external TMDS
> > transmitter...
> >
> > If you set MacOS to that mode, so that the firmware does initialize the
> > display to the highest resolution at boot, do you still get the noise ?
> 
> 
> In Panther, the display is fine.
> 
> After rebooting from panther into linux, I get the same problem. It is
> fairly minor really, and is related to areas of bright color on the
> display.
> 
> For an example of what I see, check here:
> 
> http://sprocket.stanaway.net/~david/xorg/1600x1200-rain.png
> 
> The rain is highlighted with green markers.
> 
> This is with a sony CPD-E500 display. It is similar to what I was
> getting with the apple blueberry 21", although on that, the rain was
> more pronounced, and was not vertically aligned, but diagonally aligned.
> 

Have you tried setting the dda2_on_off shift from 18 to 19 or 20? 
perhaps the shift is mode dependant.  I'll try 1600x1200 on my M3 at
some point this weekend and see if I can reproduce it.

Alex

> --
> David Stanaway <david at stanaway.net>
>