Debugging KMS (and thoughts thereof)

Scott James Remnant scott at
Wed Mar 17 02:12:04 UTC 2010

On Tue, 2010-03-16 at 18:44 -0700, Bryce Harrington wrote:

> As we move into the new world of KMS, I'm noticing that a lot of our
> established procedures and tools for debugging modesetting problems no
> longer work.
One thing I did notice from talking with upstream nouveau today and
debugging the Latitude D620 - our kernels don't have mmiotrace support
compiled in.

I'm not sure why, perhaps kernel team could answer that?

It looks like a tracer like any other, and has to be enabled through
sysfs before it actually traces - surely this would be a good thing to

That then turns all nouveau issues into "fire up nvidia-glx under
mmiotrace", "send upstream"

Scott James Remnant
scott at
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