From: Andrey Rahmatullin <wrar@altlinux.org>
To: Alan Jenkins <sourcejedi.lkml@googlemail.com>
Cc: Corentin Chary <corentincj@iksaif.net>,
lenb@kernel.org, linux-acpi@vger.kernel.org,
Luca Niccoli <lultimouomo@gmail.com>,
Len Brown <len.brown@intel.com>, Matthew Garrett <mjg@redhat.com>,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [PATCH 2/2] eeepc-laptop: don't enable camera at startup if it's already on.
Date: Tue, 20 Oct 2009 15:24:02 +0600 [thread overview]
Message-ID: <20091020092402.GI19095@wrars-comp.wrarsdomain> (raw)
In-Reply-To: <9b2b86520910200204n2089bcf1h2535e56d2ec4156e@mail.gmail.com>
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On Tue, Oct 20, 2009 at 10:04:04AM +0100, Alan Jenkins wrote:
> Yup. The original patch from Pekka was accepted alongside a patch
> which enabled auto-suspend for the uvcvideo driver by default. This
> was shown to have the same effect on CPU wakeups as measured by
> powertop.
When the camera is enabled, powertop says "device is active 100% of time".
That was enough for me :)
> Have you measured the power consumption on the current kernel using a
> more comprehensive method than powertop?
No.
> Or perhaps you have a different camera chip? Have you tried enabling
> auto-suspend manually? If it works, perhaps that driver can enable
> auto-suspend as well.
/sys/module/usbcore/parameters/autosuspend and
/sys/devices/pci0000:00/0000:00:1d.7/usb5/5-8/power/autosuspend both
contain 1, but powertop still suggests adding usbcore.autosuspend=1.
Though nothing related to USB exists in wakeup causes list.
--
WBR, wRAR (ALT Linux Team)
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next prev parent reply other threads:[~2009-10-20 9:24 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-10-16 20:22 [PATCH 0/2] eeepc-laptop updates for 2.6.32-rcX Corentin Chary
2009-10-16 20:22 ` [PATCH 1/2] Revert "eeepc-laptop: Prevent a panic when disabling RT2860 wireless when associated" Corentin Chary
2009-10-16 20:22 ` [PATCH 2/2] eeepc-laptop: don't enable camera at startup if it's already on Corentin Chary
2009-10-20 8:35 ` Andrey Rahmatullin
2009-10-20 9:04 ` Alan Jenkins
2009-10-20 9:24 ` Andrey Rahmatullin [this message]
2009-10-20 9:38 ` Alan Jenkins
2009-10-20 9:41 ` Andrey Rahmatullin
2009-10-20 14:19 ` Alan Jenkins
2009-10-20 14:31 ` Luca Niccoli
2009-10-20 10:06 ` Luca Niccoli
2009-11-03 15:25 ` Len Brown
2009-11-03 15:25 ` [PATCH 1/2] Revert "eeepc-laptop: Prevent a panic when disabling RT2860 wireless when associated" Len Brown
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