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

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Date:	Mon, 11 Aug 2008 19:18:49 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Matt Parnell <mparnell@...il.com>, linux-kernel@...r.kernel.org,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: 2.6.27-rc0 Power Bugs with HP/Compaq Laptops


> > "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
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