linux-kernel - Re: 2.6.27-rc7-git1: usb-storage breakage with non-functional disk

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Date:	Tue, 8 Jul 2008 10:38:58 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Indan Zupancic <indan@....nu>
cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Matthew Dharm <mdharm-usb@...-eyed-alien.net>,
	USB development list <linux-usb@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>, Greg KH <greg@...ah.com>,
	linux-scsi <linux-scsi@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: 2.6.27-rc7-git1: usb-storage breakage with non-functional disk

On Tue, 8 Jul 2008, Indan Zupancic wrote:

> It's not something silly like the device saying it only needs 100mA
> while in reality it needs 200mA? Or are those numbers only used to
> calculate how many devices may be connected?

If it's plugged directly into the computer then it should receive all 
the power it needs.  Unless there's an option to give it more power 
(like a second USB connector with only the power lines attached)?

> > It might work better at full speed than at high speed (although you
> > probably don't want to use it in a degraded mode).
> 
> I have ehci built-in, how can I force full speed? Hm, in the BIOS maybe.

	echo 5 >/sys/class/usb_host/usb_host1/companion

Alan Stern

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