From: "Antonino A. Daplas" <adaplas@hotpop.com>
Reply-To: adaplas@pol.net
To: Paolo Ornati <ornati@fastwebnet.it>, adaplas@pol.net
Subject: Re: 2.6.9-rc1: scrolling with tdfxfb 5 times slower
Date: Thu, 2 Sep 2004 04:10:22 +0800
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On Wednesday 01 September 2004 19:55, Paolo Ornati wrote:
> > This patch sets info->var.yres_virtual to the maximum upon driver load.
> > If this works, it's possible to get sub-1 second scrolling speed.
> >
> > Reverse the previous patch first, then apply this patch.
>
> Results for 2.6.9-rc1 + your patch (time cat MAINTAINERS):
>
> CONFIG_FB_3DFX_ACCEL=n
> ~1.27 s
>
> CONFIG_FB_3DFX_ACCEL=y
> ~0.18 s
>
> BUT with CONFIG_FB_3DFX_ACCEL enabled I get strange video
> "corruptions" (like bitmaps with random colors) that go away simply
> swithcing to another console and than back to the previous.

Might be a clipping problem?  Maybe we need to set an upper limit
to vyres, don't know for sure.  

Try doing an fbset -vyres 800, then keep doubling the number until
you get the artifacts.  If possible, do it for other bpp.

Tony 


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