[Bug 34772] [radeon] [R300] GPU lockups with when KMS is enabled

[<bug...@bu...>]

https://bugzilla.kernel.org/show_bug.cgi?id=34772





--- Comment #6 from Michel Dänzer <mi...@da...>  2011-05-20 12:11:38 ---
(In reply to comment #1)
> Anyway, things are *way* better with 2.6.38 than with 2.6.39, as with 2.6.39
> the kernel doesn't even get the colors correctly---everything that should be
> red becomes blue and so forth (any kind of endianness problem?).

That's probably nothing to do with the kernel directly but endianness bugs in
the X driver when acceleration is not available.

It would be interesting if you could bisect what broke acceleration with
radeon.agpmode=-1. Note that you should boot with radeon.no_wb=1 as well for
this, as CP writeback was only fixed during the 2.6.39 cycle (in commit
dc66b325f161bb651493c7d96ad44876b629cf6a).

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