Radeon X700 Pro can no longer do AGP 8X since commit 295823d0879a

Michel Dänzer michel at tungstengraphics.com
Thu Sep 13 12:12:08 PDT 2007

On Tue, 2007-09-11 at 03:00 -0400, Sean wrote: 
> A git-bisect shows that since commit 295823d0879a in the xf86-video-ati
> tree a X700 Pro card[1] can no longer be set to AGP 8X, using "AGPMode 8"
> in the xorg config file[2].  With older versions of the driver there was
> no error reported setting 8X mode in the log[3].
> Perhaps this is a case where the new code is doing a better job of
> detecting a problem and not setting 8X mode.  Having said that, the card
> is capable of 8X speed and the motherboard has a AGPv3 8X capable
> slot as well[4].
> A naive reading of the commit suggested that the card was not being
> detected as AGP version 3.  

That is correct, based on the capabilities reported by the kernel
agpgart module and the card's AGP_STATUS register. I don't see how the
detection could be different before and after this change...

> Adding a quick hack to force "is_v3" to true, allowed 8X mode to be set by 
> the latest driver.

Does agpgart actually set 8x though according to dmesg?

Earthling Michel Dänzer           |          http://tungstengraphics.com
Libre software enthusiast         |          Debian, X and DRI developer

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