On Thu, Aug 12, 2004 at 09:28:05AM +0100, Keith Whitwell wrote:
> Dave Airlie wrote:
> >Okay I've gotten myself a 9200 card that can do 8x, and I've a
> >motherboard that can do it.. now I know some people will tell me 8x is of
> >no practical use (but then neither is my mach64 :-)
> >
> >I spotted a patch from Hui Yu via Michael at
> >http://penguinppc.org/~daenzer/DRI/radeon-agp8x.diff
> >
> >Why haven't we merged this into the tree is there more work to be done?
> >would it be nice for the X org release?
>
> A side note - you are probably getting agp8x already. On motherboard and
> card that support 8x, things get set up by default so that all the modes
> are programmed in the same way, but get interpreted by hw as 4x the old
> (agp v2) meanings. So, if you've set your agp to 2x, you are most likely
> getting 8x.
If you have an AGP 3.0 card and chipset, the BIOS likely configures it into
3.0 capable mode, then agpgart detects that the chipset is in AGP 3.0 mode,
and sees x2 get passed to it from X, which makes no sense in that mode as
3.0 can only do x4/x8. It 'fixes' this to x4 mode. I could have made it
default to x8, but felt this would be 'safer'.
I'm puzzled why no-one has added an AGPMode 8 option to X yet.
Looking at that diff, I'm also curious why the AMD 761 fastwrite disable
isn't being done in agpgart. I've been collecting a variety of 'quirks'
like this, so at some point, I think I'll add a quirk list to agpgart
so it works regardless of which card you have plugged in.
Dave
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