linux-kernel - Re: root hub lost power or was reset

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Date:	Thu, 3 Dec 2009 09:33:47 +0100
From:	Oliver Neukum <oliver@...kum.org>
To:	"Justin P. Mattock" <justinmattock@...il.com>
Cc:	Robert Hancock <hancockrwd@...il.com>,
	"Linux-usb" <linux-usb@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: root hub lost power or was reset

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
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