From: Martin Lexa <mlexa@atlas.cz>
  To  : ggi-develop@eskimo.com
  Date: Wed, 04 Aug 1999 22:01:30 +0200

Re: ANNOUNCEMENT: New ViRGE driver

Niklas Höglund wrote:
> 
> On Tue, Aug 03, 1999 at 09:22:43PM +0200, Martin Lexa wrote:
> > Niklas Höglund wrote:
> >
> > > I tested on a fresh update from CVS. I've updated again now, though,
> > > and it seems to work well except for one thing. I've seen this
> > > behaviour earlier on an old Tseng card in DOS. This bug only occurs on
> > > modes "higher" (bandwidth-wise) than 640x480x8, and the effect is more
> > > severe the higher the mode. It seems that drawing operations somehow
> > > delay the card in "starting a new line". When the screen is not drawn
> > > on nothing happens, but when it is drawn on some lines get shifted to
> > > the right for one vertical refresh. The next vertical refresh other
> > > lines get shifted, and when the drawing is finnished the display
> > > stabilizes.
> 
> > > I've looked some more at it and it doesn't start at the left edge of
> > > the screen, but about an inch to the right of the left edge. Exactly
> > > how it looks seem to depend on what is drawn.
> 
> >   Yes, I know what do you mean.
> 
> Do you know what causes this effect? It'd be interesting to know.
  High vertical refresh rate  and low FIFO tresholds (so you
should increase not decrease as I wrote to solve that "problem").
 Please use values which are written in xfree docs (src). I don't know
what does it do when you insert some strange values.

> 
> --
>                                                 Niklas

Bye, Martin
		[E-mail: mlexa@atlas.cz]