radeon/r128 patches

[Alex Deucher]

On Tue, 21 Dec 2004 13:21:47 -0600, David Stanaway <david at stanaway.net> wrote:
> Hi,
> The problem seems to be restricted to 1600x1200 resolution with my
> monitor (21" Blueberry studio display). I get the interference (Diagonal
> rain offset from white areas) with dda2_on_off shifted 16 17 and 18
> bits.  18 bits is the best. I get the same with dual head, or single
> head external.
> 

I suppose you could try 19 or 20.  maybe the shift is somehow tied to the mode.

> When I drop the resolution down to 1280x1024 it works fine.
> 
> I have tried 85Hz, 75Hz and 70Hz modelines for 1600x1200 (The monitor is
> capable of 85Hz).
> 
> 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?

Alex

> 
> On Mon, 2004-12-20 at 16:44 -0500, Alex Deucher wrote:
> > On Mon, 20 Dec 2004 13:48:56 -0600, David Stanaway <david at stanaway.net> wrote:
> > > On Mon, 2004-12-20 at 13:33 -0600, David Stanaway wrote:
> > > > On Sat, 2004-12-18 at 14:10 -0500, Brian Victor wrote:
> > > >
> > > > > I am getting a lot of artifacts on the external display.  They look like
> > > > > vsync problems, but the syncs I'm setting in xorg.conf are exactly what
> > > > > ViewSonic says the monitor accepts.  xvidtune only wants to manipulate
> > > > > the lcd, so I don't know what I can do to fix that.  But I'm assuming
> > > > > the artifacts are due to something I'm doing wrong rather than a driver
> > > > > bug.
> > > >
> > > > I am getting this also, I had thought it was just me needing to tweak
> > > > with xvidtune running single head on external display to tweak, but
> > > > sounds like it is a common thing. I get a bit of horizontal snow top
> > > > left to bottom right, about 15 degrees.
> > >
> > >
> > > My driver was built with:
> > > R128InitDDA2Registers :: save->dda2_on_off = (Ron << 18) | Roff;
> > >
> >
> > try replacing the 18 with 17 or 16.
> 
> --
> David Stanaway <david at stanaway.net>
>