"Brian S. Julin" wrote:
>
> On Mon, 17 Sep 2001, Sven Garbade wrote:
> > I compiled libggimisc to play with the vertical retrcace detection, but
> > don't understand this error:
>
> For some reason your kernel fbdev driver is failing the request
> for the ray position. Check that you are a) running matroxfb as
> your fbdev driver and b) that you have a FBIOGET_VBLANK in the linux/fb.h
> that matches your kernel. I am not sure at what version the support for
> the vertical retrace was added.
It works under kernel 2.4.5, but not under 2.2.19.
> > This runs on a Debian Progeny Box, Xfree 402, Kernel 2.2.19 and a Matrox
> > G400 card. Does GetRayPos also runs with the dga target?
>
> WaitRayPos will eventually run under DGA when I get around to it, but
> I have looked at the DGA driver code and all the drivers use busy-polling
> to wait for the retrace.
I ask this because under X the vertcal refresh rate is almost 100 Hz,
under fbdev only nearly 60 Hz. So I have to figure out, how to configure
a framebuffer mode with 1024x768x16 at 100 Hz.
Thanks, Sven
