Re: [BISECTED] drm: random hang since 620f378 "drm: prune modes when ..."

[Jesse Barnes <jbarnes@virtuousgeek.org>]

On Wed, 16 Dec 2009 22:41:27 +0000
Arnd Bergmann <arnd@arndb.de> wrote:

> On Wednesday 16 December 2009 21:36:36 Arnd Bergmann wrote:
> > On Wednesday 16 December 2009 21:30:05 Jesse Barnes wrote:
> > > But you're sure powersave=0 was solid?  Hmm...
> > 
> > It's hard to be sure when it sometimes takes a day before a
> > broken version crashes. I can keep running this kernel with and
> > without powersave=0 some more and tell you if it stays reproducible.
> 
> Now it has crashed with i915.powersave=0 plus your patch as well
> (latest 2.6.32 git), indicating that there is something else wrong
> with the original 652c393a33 patch.

It does very little else that should affect things.  You're sure
reverting the commit makes things ok?

Other potential problems:
  - clock gating (the call to intel_init_clock_gating)
  - the actual mark_busy stuff itself (calls to intel_mark_busy)
  - intel_idle_update (but powersave=0 should prevent that)

If you want to keep testing you could try removing those calls...

-- 
Jesse Barnes, Intel Open Source Technology Center