List Archive: gentoo-amd64
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It turned out the issue with the IOMMU was a BIOS setting -- and a totally
unsuspected one at that! Of course, the AMD IOMMU device is part of the
AGP-GART, and I had never been able to get DRM/DRI working, either. The
problem with both was one and the same -- I had Fast-writes (FW) enabled
in the AGP Hypertransport configuration. Turning it off allowed both the
hardware IOMMU and DRM to work. As I had earlier figured out that I
couldn't boot with the hardware IOMMU enabled and had to use the software
one, at least past kernel 2.6.15 as they killed the SCSI bouncebuffers for
.16, I tested first with that. Once I got it working, I had a good idea
the DRM/DRI would work as well, and so it did! No more being stuck with
Mesa software 3D! Hallelujah and much rejoicing! I had been fighting
with that on and off for quite awhile (over a year, tho it got much more
urgent when I upgraded from a gig to 8 gig of RAM and needed the IOMMU),
and had almost come to believe that part of my mobo chipset was borken.
Glad it wasn't! =8^)
Duncan - List replies preferred. No HTML msgs.
"Every nonfree program has a lord, a master --
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