lkml.org 
[lkml]   [2009]   [Jan]   [2]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: Enable CONFIG_USB_SUSPEND by default or some mobile HD can't be unplugged safely
    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


    \
     
     \ /
      Last update: 2009-01-03 03:35    [W:0.021 / U:32.008 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site