[Nouveau] [Bug 66696] Nouveau does DMA to/from unexpected address

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=66696

--- Comment #1 from Ilia Mirkin <imirkin at alum.mit.edu> ---
Looking at that redhat bug report, someone added comments about similar issues
on NV43 a while after it was closed. Since you have a NV4B, I expect that the
issue is the same.

Has this always been happening, or is this a new issue? (Guessing the
former...)

If it's a new issue, doing a kernel bisect would narrow down the commit that
broke things.

If it has always been like that, does this issue occur with the nvidia binary
driver? If not, doing an mmiotrace would be helpful (guide at
https://wiki.ubuntu.com/X/MMIOTracing). The register written to by 4eb3033c
only exists on NV50+ according to envytools.

Are all the errors the same (i.e. trying to read from address 0) or does it
vary?

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