Comment 1 for bug 321740

I can confirm this Bug. Having the same issue with a Cordless Desktop MX700.
The Mouse is working OK, but almost all Multimedia Keys are working only after I unplug and Replug the Cordless Receiver.
I attached the xorg.0.log file, with the content of informations during the unplugging and replugging.
Here is what the dmesg-output looks like when unplugging and replugging this device.

[ 129.856059] usb 3-1: USB disconnect, address 4
[ 133.885041] usb 3-1: new low speed USB device using uhci_hcd and address 5
[ 134.063559] usb 3-1: configuration #1 chosen from 1 choice
[ 134.088412] input: Logitech USB Receiver as /devices/pci0000:00/0000:00:1d.2/usb3/3-1/3-1:1.0/input/input9
[ 134.136210] input,hidraw0: USB HID v1.10 Keyboard [Logitech USB Receiver] on usb-0000:00:1d.2-1
[ 134.172670] input: Logitech USB Receiver as /devices/pci0000:00/0000:00:1d.2/usb3/3-1/3-1:1.1/input/input10
[ 134.256194] input,hidraw1: USB HID v1.10 Mouse [Logitech USB Receiver] on usb-0000:00:1d.2-1

Here the output of "sudo lsusb -v" - Limiting the output to the Logitech receiver only:
Bus 003 Device 005: ID 046d:c50b Logitech, Inc. Cordless Desktop Optical
Device Descriptor:
  bLength 18
  bDescriptorType 1
  bcdUSB 1.10
  bDeviceClass 0 (Defined at Interface level)
  bDeviceSubClass 0
  bDeviceProtocol 0
  bMaxPacketSize0 8
  idVendor 0x046d Logitech, Inc.
  idProduct 0xc50b Cordless Desktop Optical
  bcdDevice 21.00
  iManufacturer 1 Logitech
  iProduct 2 USB Receiver
  iSerial 0
  bNumConfigurations 1
  Configuration Descriptor:
    bLength 9
    bDescriptorType 2
    wTotalLength 59
    bNumInterfaces 2
    bConfigurationValue 1
    iConfiguration 0
    bmAttributes 0xa0
      (Bus Powered)
      Remote Wakeup
    MaxPower 98mA
    Interface Descriptor:
      bLength 9
      bDescriptorType 4
      bInterfaceNumber 0
      bAlternateSetting 0
      bNumEndpoints 1
      bInterfaceClass 3 Human Interface Device
      bInterfaceSubClass 1 Boot Interface Subclass
      bInterfaceProtocol 1 Keyboard
      iInterface 0
        HID Device Descriptor:
          bLength 9
          bDescriptorType 33
          bcdHID 1.10
          bCountryCode 0 Not supported
          bNumDescriptors 1
          bDescriptorType 34 Report
          wDescriptorLength 63
         Report Descriptors:
           ** UNAVAILABLE **
      Endpoint Descriptor:
        bLength 7
        bDescriptorType 5
        bEndpointAddress 0x81 EP 1 IN
        bmAttributes 3
          Transfer Type Interrupt
          Synch Type None
          Usage Type Data
        wMaxPacketSize 0x0008 1x 8 bytes
        bInterval 10
    Interface Descriptor:
      bLength 9
      bDescriptorType 4
      bInterfaceNumber 1
      bAlternateSetting 0
      bNumEndpoints 1
      bInterfaceClass 3 Human Interface Device
      bInterfaceSubClass 1 Boot Interface Subclass
      bInterfaceProtocol 2 Mouse
      iInterface 0
        HID Device Descriptor:
          bLength 9
          bDescriptorType 33
          bcdHID 1.10
          bCountryCode 0 Not supported
          bNumDescriptors 1
          bDescriptorType 34 Report
          wDescriptorLength 190
         Report Descriptors:
           ** UNAVAILABLE **
      Endpoint Descriptor:
        bLength 7
        bDescriptorType 5
        bEndpointAddress 0x82 EP 2 IN
        bmAttributes 3
          Transfer Type Interrupt
          Synch Type None
          Usage Type Data
        wMaxPacketSize 0x0008 1x 8 bytes
        bInterval 10
Device Status: 0x0000
  (Bus Powered)

If you need any more details to analyse it - please let me know.
PS: I have tested the kernel proposed in Bug #281993 (regression fix for Microsoft Keyboards). Didn't work.
PPS: I had the same issue in Hardy when letting the Keyboard running using the evdev Driver. When disabling it and configuring the Keyboard/Mouse Manually, it worked. The configurations that worked are documented here:
http://stargate.solsys.org/mod.php?mod=faq&op=extlist&topicid=7&expand=yes#111
http://stargate.solsys.org/mod.php?mod=faq&op=extlist&topicid=7&expand=yes#110
As you can see the keyboard and mouse drivers had to be explicitely used.