https://bugzilla.kernel.org/show_bug.cgi?id=19002





--- Comment #9 from Duncan <1i5t5.dun...@cox.net>  2010-10-14 18:58:11 ---
Unfortunately, while I could verify from dmesg that the kernel was indeed using
radeon.agpmode=-1, it didn't help. =:^(

I verified that radeon.agpmode=-1 DID work with the culprit commit reverted,
just as normal mode did, so it wasn't some other problem with it.  And, for
good measure I checked radeon.agpmode=4 as well.  As expected, it worked on the
kernel with the revert, but didn't without the revert.  (This is still the
rc7-149-g29979aa I'm testing, FWIW.)

Meanwhile, with -1, dmesg says PCIE mode.  That's PCI (not E) mode too, right? 
Because this system's too old to have PCIE at all, tho it does have PCI-X. 
Since it works on the revert-kernel I expect it's correct, but just verifying.

Also, GTT memory is 128 MB in normal mode, 512 MB with -1.  Again, that's
normal, right?  (FWIW, 6 gigs system RAM, 1 gig vram, 256 MB AGP  aperture,
split down the middle between AGPGART IOMMU and actual AGP usage.)

I tried a bunch of other stuff too, including radeon.modeset=0 (didn't work in
X for either the good or bad kernel) on the bootline, xorg.conf SWCursor,
color-tiling both on and off (no change to results, good kernel worked, bad
didn't), etc.

What's next?

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