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Date: Fri, 05 Jun 2009 15:55:49 +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 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 -- 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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