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Date: Sun, 7 Dec 2008 14:52:03 -0800 From: Arjan van de Ven <arjan@...radead.org> To: "Rafael J. Wysocki" <rjw@...k.pl> 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 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.... -- Arjan van de Ven Intel Open Source Technology Centre For development, discussion and tips for power savings, visit http://www.lesswatts.org -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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