Re: 2.6.9-rc1: scrolling with tdfxfb 5 times slower

Antonino A. Daplas
2004-09-01T20:10:59Z

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