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    SubjectRe: 2.6.9-rc1: scrolling with tdfxfb 5 times slower
    On Wednesday 01 September 2004 15:20, Paolo Ornati wrote:

    > Ok, with this patch and CONFIG_FB_3DFX_ACCEL=y the scrolling speed comes
    > back (only a bit slower than with without CONFIG_FB_3DFX_ACCEL):
    > $ time cat MAINTAINERS: ~2.67s

    Ok. However, I'm still wondering at the scrolling speed, it's a bit slower
    than what I would expect (I get < 1 second with vesafb which is completely

    Did you set info->flags = FBINFO_DEFAULT | FBINFO_HWACCEL_YPAN?
    Do you use the 'nopan' boot option?

    Because if you answer yes to the first question and no to the second, that
    means that tdfxfb_pan_display() is probably broken.

    BTW, what does fbset -i say, and what's your hardware setup?

    > Another interesting thing is that if I enable CONFIG_FB_3DFX_ACCEL without
    > your patch the screen becomes black and the kernel stop working at boot
    > time (when the mode switch happens).

    tdfxfb_cursor() is broken, so I disabled that. It's the reason your machine
    hangs at boot time if CONFIG_FB_3DFX_ACCEL is set to y.


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