linux-kernel - Re: usb autosuspend is history after S2R (also on 2.6.31; UVC?)

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Date:	Tue, 15 Sep 2009 21:48:28 +0200
From:	Oliver Neukum <oliver@...kum.org>
To:	Andreas Mohr <andi@...as.de>
Cc:	Alan Stern <stern@...land.harvard.edu>,
	"Greg Kroah-Hartman" <gregkh@...e.de>, laurent.pinchart@...net.be,
	Matthew Garrett <mjg59@...f.ucam.org>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: usb autosuspend is history after S2R (also on 2.6.31; UVC?)

Am Dienstag, 15. September 2009 20:51:45 schrieb Andreas Mohr:

> So, does the uvc driver need a bit of handholding here?
> It likely shouldn't simply forget about its autosuspend status after
> resume...

Can you please provide what you get when you read the "level" file
of the device's power directory?

Secondly, please verify, that it works before the STR cycle and post
a syslog of a suspend/resume cycle with CONFIG_USB_DEBUG and
only this device attached if possible. Thirdly, please verify that only
uvc is affected.

> Or would Matthew's uvc autosuspend patch
> http://osdir.com/ml/fedora-extras-commits/2009-07/msg06079.html
> help here?

Please test it. It shouldn't work, but if it works there's a fundamental
flaw.

	Regards
		Oliver

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