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    SubjectRe: 2.6.9-rc1: scrolling with tdfxfb 5 times slower
    Date
    On Wednesday 01 September 2004 22:10, Antonino A. Daplas wrote:
    > 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.

    Doing some tests I've discovered that BPP doesn't influence this behavior
    (kernel 2.6.9-rc1 + your patch, CONFIG_FB_3DFX_ACCEL=y):

    BPP 800 1600 3200 6400 <-- VYRES
    8 OK OK OK X
    16 OK OK OK X
    24 OK OK OK X
    32 OK OK OK X

    The upper limit for VYRES (after a lot of tests) seems to be around
    4100/4200 (with 4100 all seems OK while with 4200 there are some
    corruptions). This is the same for all BPP.

    I don't understand why I have this problem only with
    CONFIG_FB_3DFX_ACCEL=y...

    --
    Paolo Ornati
    Gentoo Linux (kernel 2.6.8-gentoo-r3)
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