Re: 2.6.27-rc0 Power Bugs with HP/Compaq Laptops

[Ingo Molnar <mingo@elte.hu>]

> > "This is not the right fix. Instead, HPET should be used as a timer 
> > source for dynticks. This is not in 2.6.26, but I tried the 
> > linux-next tree (google it) and it looked like dynticks worked fine, 
> > without disabling C1E. Can't place my finger on the exact commit, 
> > but you could check."

Would be nice to figure out which exact change solves the problem, so 
that we could fast-route it into v2.6.27. (and for eventual .26 and .25 
backporting, if it's simple enough)

first thing would be to check whether tip/master works fine:

  http://people.redhat.com/mingo/tip.git/README

if that works fine it would be nice to check whether the pending changes 
in tip/timers/hpet solves this particular issue. That can be done by:

  git-checkout -b tmp.test tip/timers/hpet

[ once you have set up tip as a remote repository, as described in the 
  README above. ]

If tip/timers/hpet solves the problem then it's one of these five 
commits that solves it:

 f92a789: hpet: /dev/hpet - fixes and cleanup, fix
 64a76f6: hpet: /dev/hpet - fixes and cleanup
 f356181: x86: add PCI ID for 6300ESB force hpet
 3243b4e: x86: add another PCI ID for ICH6 force-hpet
 70ef6d5: x86: get irq for hpet timer

	Ingo