linux-kernel - Re: Enable CONFIG_USB_SUSPEND by default or some mobile HD can't be unplugged safely

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Date:	Thu, 01 Jan 2009 22:32:40 +0500
From:	"Alexander E. Patrakov" <patrakov@...il.com>
To:	public-gregkh-l3A5Bk7waGM@...h.gmane.org,
	public-linux-usb-u79uwXL29TY76Z2rM5mHXA@...h.gmane.org,
	public-linux-kernel-u79uwXL29TY76Z2rM5mHXA@...h.gmane.org,
	public-elliot.li.tech-Re5JQEeQqe8AvxtiuMwx3w@...h.gmane.org
Subject: Re: Enable CONFIG_USB_SUSPEND by default or some mobile HD can't
 be   unplugged safely



Yan Li wrote:
> 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.

You have obviously tested only Windows XP, because Vista doesn't cut the 
power for at least some USB devices. And congratulations for obtaining a 
Vista-incompatible hard drive (of course, joking).

BTW, does the "eject /dev/$DEV" command help?

-- 
Alexander E. Patrakov

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