linux-kernel - Re: [Bug #12337] ~100 extra wakeups reported by powertop

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Message-ID: <819821.83409.qm@web53303.mail.re2.yahoo.com>
Date:	Tue, 24 Feb 2009 05:50:34 -0800 (PST)
From:	Alberto Gonzalez <luis6674@...oo.com>
To:	Eric Anholt <eric@...olt.net>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Nick Piggin <nickpiggin@...oo.com.au>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Kernel Testers List <kernel-testers@...r.kernel.org>
Subject: Re: [Bug #12337] ~100 extra wakeups reported by powertop

--- On Tue, 2/24/09, Nick Piggin <nickpiggin@...oo.com.au> wrote:

> > I really wish I could do more, but learning to compile
> a custom kernel for
> > my hardware and do a git bisect is something I just
> can't afford now. If
> > relevant people try to reproduce it but can't, and
> say only possible
> > solution would be for me to bisect it I guess I could
> try to give it a go
> > when I get some spare time.
> 
> Fair enough. Reporting a problem is always very
> appreciated.
> 
> Pinging Eric and Jesse ;)

Thank you Nick.

Since Arch Linux is not popular among kernel developers I just tested Fedora 10 Live-CD (KDE) and I can reproduce the exact same problem, even if Fedora 10 has kernel 2.6.27 and for me the problem appeared in .28 (but I guess Fedora adds many patches, so probably the "guilty" commit was backported to 2.6.27.5-117-FC10-i686).

Steps:
- Boot into Fedora 10 Live CD (obviously, into the default graphical mode)
- Install Powertop (yum install powertop) and run it
- I get about 60 wakeups per second from i915@....... leaving the system idle
- Switch to console and back to X. The wakeups are gone.

I hope that helps.


      
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