linux-kernel - Re: [Bug #12152] Huge wakeups number from i1915

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Date:	Sun, 7 Dec 2008 23:52:06 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	"Yves-Alexis Perez" <corsac@...ian.org>
Subject: Re: [Bug #12152] Huge wakeups number from i1915

On Sunday, 7 of December 2008, Arjan van de Ven wrote:
> On Sun,  7 Dec 2008 21:32:54 +0100 (CET)
> "Rafael J. Wysocki" <rjw@...k.pl> wrote:
> 
> > This message has been generated automatically as a part of a report
> > of recent regressions.
> > 
> > The following bug entry is on the current list of known regressions
> > from 2.6.27.  Please verify if it still should be listed and let me
> > know (either way).
> > 
> > 
> > Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12152
> > Subject		: Huge wakeups number from i1915
> > Submitter	: Yves-Alexis Perez <corsac@...ian.org>
> > Date		: 2008-12-02 16:48 (6 days old)
> > References	:
> > http://marc.info/?l=linux-acpi&m=122823656702994&w=4
> > 
> 
> at least in some of the cases where this has been seen the cause is the
> following:
> The i915 DRM driver used to do polling for completion, busy waiting. It
> moved to be interrupt driven, which is usually better for power, but it
> will show up as more wakeups in powertop....

IOW, this is not a regression?

Rafael
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