Comment 57 for bug 404185

Hey,

I was just looking through the USB2 spec and stumbled upon section 11.23.2.1 - the DeviceRemovable descriptor. Seems to work for, at least, my IBM UltraNav keyboard [0] - see [1] for lsusb snippets.

Can anyone with access to a Dell Mini (Richard?) please attach 'lsusb -vvv' and 'lsusb -t' output? Many thanks!

If it checks out for the Dell Mini, we should be able to figure out whether a given USB device really is removable or not (could be incorporated as a patch to udev's usb_id).

     David

[0] : http://www.geek.com/articles/chips/review-lenovo-thinkpad-ultranav-keyboard-20090325/

[1] :
lsusb -t:
[...]
    |-Dev# 3 Vendor 0x04b3 Product 0x3016
    | |-Dev# 5 Vendor 0x04b3 Product 0x3018
    | `-Dev# 6 Vendor 0x06cb Product 0x0009
[...]

lsusb -vvv:

[...]
Hub Descriptor:
  bLength 9
  bDescriptorType 41
  nNbrPorts 4
  wHubCharacteristic 0x0009
    Per-port power switching
    Per-port overcurrent protection
  bPwrOn2PwrGood 50 * 2 milli seconds
  bHubContrCurrent 100 milli Ampere
  DeviceRemovable 0x18
  PortPwrCtrlMask 0xff
 Hub Port Status:
   Port 1: 0000.0100 power
   Port 2: 0000.0100 power
   Port 3: 0000.0303 lowspeed power enable connect
   Port 4: 0000.0303 lowspeed power enable connect
[...]