From: Yan Li <elliot.li.tech@gmail.com>
To: gregkh@suse.de, linux-usb@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Subject: Enable CONFIG_USB_SUSPEND by default or some mobile HD can't be unplugged safely
Date: Fri, 2 Jan 2009 00:03:43 +0800 [thread overview]
Message-ID: <20090101160343.GA4278@thyme.bj.intel.com> (raw)
Hello List,
By default CONFIG_USB_SUSPEND is not enabled and today I got bite by
this when I got a new WDC My Book hard drive. I have no way to unplug
it safely, according to it's manual, with a kernel that doesn't have
CONFIG_USB_SUSPEND=y.
On it's manual read "you should unplug and remove the device only when
the light is off." On Linux unmounting it won't turn it's light off
and I can feel it's motor is still running. The only way to unplug it
properly on a Linux system, as to my knowledge, is to echo `suspend'
to `/sys/bus/usb/devices/$DEV/power/level'. And one has to have
CONFIG_USB_SUSPEND=y to do this.
On Windows and Mac OS, `safely remove this device' function effectly
turns it into `suspend' mode, and it's light off.
I'm new in this field and I understood people's concern on enabling
autosuspend. As to my understanding, `enabling suspend' and `enabling
autosuspend' should be controlled by two different knobs. I did a
quick search in LKML and haven't found specific oppose to enable USB
suspend by default, and Debian has started shipping a kernel with
it turned on since 2.6.26.
Perhaps we should consider turning it on by default? Thanks!
--
Li, Yan
next reply other threads:[~2009-01-01 16:04 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-01-01 16:03 Yan Li [this message]
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
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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