From: Yan Li <elliot.li.tech@gmail.com>
To: Alan Stern <stern@rowland.harvard.edu>
Cc: linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: Enable CONFIG_USB_SUSPEND by default or some mobile HD can't be unplugged safely
Date: Sat, 3 Jan 2009 10:33:08 +0800 [thread overview]
Message-ID: <20090103023308.GB6778@thyme.bj.intel.com> (raw)
In-Reply-To: <Pine.LNX.4.44L0.0901021056120.26494-100000@netrider.rowland.org>
On Fri, Jan 02, 2009 at 11:04:40AM -0500, Alan Stern wrote:
> > Now I know 3 methods supposed can be used to shut the device:
> > 1. (Alan Stern said Windows use this) cut the USB port's power
>
> I said no such thing! In fact, I said exactly the opposite: Windows
> does _not_ cut the port's power. Instead it disables the port.
Sorry, my mistake.
> The best approach is to send a SYNCHRONIZE CACHE command followed by
> START-STOP (if the device supports it), and then to disable or suspend
> the port. In Linux, those two commands will be sent automatically if
> you unbind the device from usb-storage. The suspend has to be done
> manually unless you have set up a udev rule (or something equivalent)
> to enable autosuspend for the device. Of course, this requires
> CONFIG_USB_SUSPEND.
Quite clear, thanks.
--
Li, Yan
next prev parent reply other threads:[~2009-01-03 2:33 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-01-01 16:03 Enable CONFIG_USB_SUSPEND by default or some mobile HD can't be unplugged safely Yan Li
2009-01-01 16:07 ` [PATCH] enable CONFIG_USB_SUSPEND by default Yan Li
2009-01-01 17:29 ` Enable CONFIG_USB_SUSPEND by default or some mobile HD can't be unplugged safely Alan Stern
2009-01-02 13:23 ` Yan Li
2009-01-01 17:32 ` Alexander E. Patrakov
2009-01-01 17:45 ` Alan Stern
2009-01-02 13:37 ` Yan Li
2009-01-02 13:46 ` Alexander E. Patrakov
2009-01-01 19:09 ` Robert Hancock
2009-01-02 9:56 ` Tino Keitel
2009-01-02 14:00 ` Yan Li
2009-01-02 14:08 ` Tino Keitel
2009-01-02 14:28 ` Yan Li
2009-01-02 16:04 ` Alan Stern
2009-01-03 2:33 ` Yan Li [this message]
2009-01-02 15:50 ` Mark Lord
2009-01-02 15:51 ` Mark Lord
2009-01-02 18:15 ` Tino Keitel
2009-01-03 2:24 ` Yan Li
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