Re: Unsupported AGP-bridge on VIA VT8633

[Rogier Wolff]

On Thu, Nov 21, 2002 at 11:56:23PM +0100, Stian Jordet wrote:
> tor, 2002-11-21 kl. 23:40 skrev Dave Jones:
> > On Thu, Nov 21, 2002 at 11:20:31PM +0100, Stian Jordet wrote:
> > 
> >  > You were not really clear here. I tried it as a boot-time argument, because I
> >  > have agp-support compiled in. But I guess I could and should try it as a module.
> > 
> > Yup. Then do a `modprobe agpgart agp_try_unsupported=1'
> > 
> >  > I'll do that now. But why do I have to use agp_try_unsupported=1?
> > 
> > Because if it works, we can then add it to the ID table.
> 
> It works, i think. I get this message when I load it:
> 
> Linux agpgart interface v0.99 (c) Jeff Hartmann
> agpgart: Maximum main memory to use for agp memory: 439M
> agpgart: Trying generic Via routines for device id: 3091
> agpgart: AGP aperture is 64M @ 0xf8000000

Hi Dave, Stian,

"Same here": The module loads...

However, I have the impression that it doesn't work.  I first noticed 
that my Xserver was taking 50% of my CPU while playing videos. This
is much less on all other computers that I tried that on. 

Turns out that "write bandwidth" to video memory is less than 40Mb
per second. On another system with the same video card, but with a 
supported AGP bridge, I get almost 200Mbyte per second. I'll go and
dig for "testgart" and see what that proves.... 

			Roger. 

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