From mboxrd@z Thu Jan  1 00:00:00 1970
From: Pavel Machek <pavel@ucw.cz>
Subject: Re: Problems with PM_FREEZE
Date: Wed, 28 Sep 2005 22:53:19 +0200
Message-ID: <20050928205319.GC2506@elf.ucw.cz>
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To: Alan Stern <stern@rowland.harvard.edu>
Cc: Nigel Cunningham <ncunningham@cyclades.com>, Linux-pm mailing list <linux-pm@lists.osdl.org>
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On St 28-09-05 12:17:33, Alan Stern wrote:
> [Replying to two people at once]
> 
> On Wed, 28 Sep 2005, Nigel Cunningham wrote:
> On Wed, 28 Sep 2005, David Brownell wrote:
> 
> > > 	If the image does contain USB drivers and the boot kernel
> > > 	did not meddle with the device states, then the devices
> > > 	will be suspended even though the image thinks they are
> > > 	frozen.
> > 
> > So a power off or reboot doesn't reset the USB devices?
> 
> > Those would reset them, yes ... or more to the point, disconnect
> > them.  All the checkpoint/resume style PM scenarios should trigger
> > disconnection for every USB device.  (And in fact they do, with
> > the USB PM fixes upcoming for 2.6.15 ... that seems to have been
> > broken in the past few releases.)
> 
> You need to state these things carefully.  A complete power-off does
> reset/disconnect USB devices.  However, turning off your computer
> might not do a complete power-off; it may well leave suspend current 
> available.  If that's true, USB devices won't be disconnected.

Examples, please. Thinkpad X32 certainly does not provide power on USB
when turned off.
								Pavel

-- 
if you have sharp zaurus hardware you don't need... you know my address

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