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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <200912030933.47769.oliver@neukum.org>
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
--
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/