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Date: Fri, 05 Jun 2009 16:08:37 +0100 From: Alan Jenkins <alan-jenkins@...fmail.co.uk> To: Pekka Enberg <penberg@...helsinki.fi> CC: Corentin Chary <corentin.chary@...il.com>, acpi4asus-user@...ts.sourceforge.net, len.brown@...el.com, linux-kernel@...r.kernel.org, USB list <linux-usb@...r.kernel.org> Subject: Re: [PATCH] eeepc-laptop: enable camera by default Alan Jenkins wrote: > Pekka Enberg wrote: >> Hi Alan, >> >> On Fri, 2009-06-05 at 15:38 +0100, Alan Jenkins wrote: >> >>> Ok. I didn't bother shutting down my system, but I get a similar >>> difference; 16 wakeups/s disabled v.s. 25 enabled. Anecdotally, >>> disabling the camera does help battery life, and presumably Asus had >>> good reason to implement it! (The shipped OS "fixes" the usability >>> problem by patching the camera apps). >>> >>> BUT I found that autosuspend didn't seem to break anything, and >>> enabling it also got me down to 16 wakeups/s. I think this is ideal >>> because autosuspend is automatic so I can save power without manual >>> toggling. >>> >>> Here's some magic to enable autosuspend: >>> >>> # echo -n auto > /sys/bus/usb/drivers/uvcvideo/*:*/../power/level >>> >>> Ideally this wants to be enabled automatically using a udev rule. >>> >> >> Can the kernel do this by default for this specific driver on eeepc? >> >> Pekka >> >> > > Auto-suspend white-listing would be done on the basis of USB ids > (vendor, product). At the moment it's expected that userspace should > take ownership of it. There's no infrastructure for in-kernel > whitelisting. I think. > > Large lists in udev rules can work, there are already lists of USB > devices to set permissions for libusb access, e.g. for libmtp. > > [CC usb list - in the hope someone will point out if I got this wrong > :-)] > > Alan Btw I've now tested the udev rule, you can just dump this in a new .rules file under /etc/udev/rules.d: SUBSYSTEM=="usb", ATTR{idVendor}=="eb1a", ATTR{idProduct}=="2761", ATTR{power/level}="auto" Not sure who I should submit it to though :-). debian-eeepc would take it, but perhaps it should go in udev's default rules. Regards Alan -- 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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