Messages in this thread | | | From | Arnd Bergmann <> | Subject | Re: [BISECTED] drm: random hang since 620f378 "drm: prune modes when ..." | Date | Sun, 13 Dec 2009 21:31:07 +0000 |
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On Sunday 13 December 2009 20:00:18 Daniel Vetter wrote: > On Sun, Dec 13, 2009 at 12:30:25PM +0000, Arnd Bergmann wrote: > > And now it's obvious that my computer hates me. 12 hours of uptime, one reboot > > to check the old other version is broken, it crashes. I reboot into the > > good version, send out the above email and the next minute it crashes again. > > c05422d52ee6b is not the culprit. Sorry Daniel for blaming your patch. > > No problem. Looks like your hunting a pretty ugly Heisenbug. There's quite > a interesting blog post by Paul McKenney, esp. the solution to "Quick Quiz 1" > might be usefull in your case: > > http://paulmck.livejournal.com/14639.html
Thanks! In fact I've actually read that post on the kernel planet and decided to do basically a linear search through the i915 patches merged into 2.6.32.
The current result is 67cf781bea5 "drm/i915: Make the downclocking debug code be under DRM_DEBUG not DRM_ERROR." is known bad, while 043029655 "drm/i915: Support IGD EOS" is probably good, pointing to Jesses 652c393a33 "drm/i915: add dynamic clock frequency control" as the next best guess. Unfortunately, that is a rather large change that is not easy to revert on current kernels.
I'll keep running my machine on the 043029655 level and tell you if it keeps working a few more days.
Arnd
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