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Subject: Re: kern/2181: 2.2-ALPHA flickers/wavers part of the upper monitor during system work
In-Reply-To: <16143.850133431@critter.tfs.com> from Poul-Henning Kamp at "Dec 9, 96 01:10:31 pm"
To: phk@critter.tfs.com (Poul-Henning Kamp)
Date: Tue, 10 Dec 1996 18:42:17 +0100 (MET)
Cc: freebsd@xaa.stack.nl, freebsd-bugs@freebsd.org, sos@freebsd.org
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In reply to Poul-Henning Kamp who wrote:
> In message <199612091100.DAA28360@freefall.freebsd.org>, "FreeBSD matters of Ma
> >
> > > >Description:
> > > Ok. The problem is that with the 2.2-ALPHA the screen flickers/wavers
> > > at the top during system work... You know it pushes in and out, etc.
> > > It is apparently a syscons problem that does NOT involve virtual
> > > consoles (i turned all of em off and tried as well). The card is a S3
> > > Trio64V+ on a 14 inch monitor
> > 
> > I noticed the same problem with a Diamond Stealth card, as well as with a
> > machine using an ET4000.
> 
> Indeed, I was thinking my old monitor had finally given up on me.
> 
> I see the same on a "STB Horizon VL" here.

When _exactly_ is this filcker/waving ??
I know that on certain video HW there is a slight jitter when moving
the pseudographic mousepointer. This could also happen when using
the "destructive" cursor. The problem is that these two features
reprograms some of the font in display memory. Although I test for
vertical sync, and does the updates when in sync, it seems to 
cause slight problems on some HW. I used to see this on my
#9GXE but the last changes in that area of syscons removed them
almost completely. Maybe experimenting with the exact position
of the reprogramming can yield better results...

-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
Søren Schmidt               (sos@FreeBSD.org)               FreeBSD Core Team
                Even more code to hack -- will it ever end
..