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

Rafael J. Wysocki
2008-12-07T22:52:06Z

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-KKrjLPT3xs0@public.gmane.org> 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-8fiUuRrzOP0dnm+yROfE0A@public.gmane.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