Debugging tools/approach for GPU hangs?

Jesse Barnes jesse.barnes at
Wed Sep 16 00:10:45 BST 2009

On Sun, 6 Sep 2009 00:23:01 -0700
Steve Langasek <steve.langasek at> wrote:

> On Sat, Sep 05, 2009 at 10:16:28PM -0700, Bryce Harrington wrote:
> > On Fri, Sep 04, 2009 at 08:12:09AM -0700, Jesse Barnes wrote:
> > > > >  * Documenting all of the above so that it can be easily
> > > > > executed by reasonably technical users
> > > There are some reset patches available, but they don't seem to
> > > work in all cases.  It would be good to know if they were useful
> > > for any of your reported hangs...  It might be that they're
> > > better than nothing and we should push them upstream now.
> > Unfortunately the freeze bugs I've seen reported recently appear to
> > be difficult for the reporters to reproduce at will (e.g. occur
> > only after a few days).  But it definitely sounds like something
> > worth pulling in for Karmic+1.
> Why would we not want to pull these for karmic?  Is there a
> significant risk of regressions with these patches?
> If the only problem is that they don't always work, that's still
> better than where we are now, surely.

FYI, Ben Gamari posted an updated version of the reset patchset.  It
seems to work reliably now, so you might want to pick it up at some
point.  It generates uevents when a reset happens, so you can further
track GPU hangs and bugs.

Jesse Barnes, Intel Open Source Technology Center

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