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From: Oliver Neukum <oliver@neukum.org>
To: "Justin P. Mattock" <justinmattock@gmail.com>
Cc: Robert Hancock <hancockrwd@gmail.com>,
	"Linux-usb" <linux-usb@vger.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: root hub lost power or was reset
Date: Thu, 3 Dec 2009 09:33:47 +0100	[thread overview]
Message-ID: <200912030933.47769.oliver@neukum.org> (raw)
In-Reply-To: <4B170D46.9030701@gmail.com>

Am Donnerstag, 3. Dezember 2009 01:58:46 schrieb Justin P. Mattock:
> >> Now looking at dmesg I see:
> >>
> >> [ 413.551845] uhci_hcd 0000:00:1d.0: PCI INT A -> GSI 23 (level, low)
> >> -> IRQ 23
> >> [ 413.551855] uhci_hcd 0000:00:1d.0: setting latency timer to 64
> >> [ 413.551887] usb usb2: root hub lost power or was reset
> >
> > Is that unexpected? It seems reasonable to me..
> 
> honestly I can't remember seeing this or not.
> if this is normal then I'll leave it as is.

This happens if your system cuts power to USB during S2.
It trades a small reduction in energy consumption against
losing support for all devices whose drivers don't support
reset_resume().

This is a design feature of your system or BIOS, not a bug.

	Regards
		Oliver

  reply	other threads:[~2009-12-03  8:33 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-12-02 22:34 Justin Mattock
2009-12-02 23:19 ` Oliver Neukum
2009-12-02 23:37   ` Justin Mattock
2009-12-03  0:10 ` Robert Hancock
2009-12-03  0:58   ` Justin P. Mattock
2009-12-03  8:33     ` Oliver Neukum [this message]
2009-12-03 15:16       ` Alan Stern
2009-12-03 16:21         ` Justin P. Mattock
2009-12-03 16:45         ` Oliver Neukum
2009-12-04 18:22           ` Justin P. Mattock

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