Logitech-Inc.

Logitech, Inc. Unifying Receiver

The Unifying Receiver is shipped with:
Logitech MK540 ADVANCED
Logitech MK850 Performance
Logitech Wireless Keyboard K360
Logitech Wireless Keyboard K400 Plus
Logitech Wireless Mouse M345
Logitech Wireless Trackball ERGO M575

No longer produced:
Logitech Wireless Trackball M570

046d:c52b

2013

USB

trisquel_6_0 , trisquel_7_0

3.14.19-gnu, 3.13.0-39-lowlatency

yes

hid_logitech, hid_logitech_dj, usbhid

[p]The Logitech Unifying Receiver is a USB plug that can listen to several computer peripherals. A single plug can be paired with one mouse, and one keyboard. It should be noted that newer Logitech products support Bluetooth. This is useful if you for example forget or drop the Unifying Receiver USB plug. However, Unifying Receivers can be purchased separately. Note that the following devices are vulnerable to MouseJacking attack when they are connected to the Unifying Receiver: K360, K400r, K750, K830 ([a]https://www.bastille.net/research/vulnerabilities/mousejack/affected-devices|source[/a])[/p]

[h1]Recommended software[/h1]
[p][a]https://github.com/pwr-Solaar/Solaar|Solaar[/a] (instead of Logitech's proprietary Unifying Software) "is a Linux manager for many Logitech keyboards, mice, and trackpads that connect wirelessly to a USB Unifying, Bolt, Lightspeed, or Nano receiver; connect directly via a USB cable; or connect via Bluetooth." solaar is packaged for many distros! A typical use case is that you can set the DPI to higher values than your desktop environment allows.[/p]

[h2]Pairing[/h2]

[p]The Logitech Unifying Receiver is paired with the hardware that it ships with. However, USB plugs can be paired and unpaired with some Logitech branded mice and keyboard with the recommended software.[/p]

[h1]Hardware information[/h1]
[p]lsusb[/p]
[code]Bus 003 Device 078: ID 046d:c52b Logitech, Inc. Unifying Receiver[/code]

[p]lsusb -v[/p]

[code]Bus 003 Device 078: ID 046d:c52b Logitech, Inc. Unifying Receiver
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 32
idVendor 0x046d Logitech, Inc.
idProduct 0xc52b Unifying Receiver
bcdDevice 24.00
iManufacturer 1 Logitech
iProduct 2 USB Receiver
iSerial 0
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 84
bNumInterfaces 3
bConfigurationValue 1
iConfiguration 4 RQR24.00_B0018
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 1.11
bCountryCode 0 Not supported
bNumDescriptors 1
bDescriptorType 34 Report
wDescriptorLength 59
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 8
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 1.11
bCountryCode 0 Not supported
bNumDescriptors 1
bDescriptorType 34 Report
wDescriptorLength 148
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 2
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 2
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 3 Human Interface Device
bInterfaceSubClass 0 No Subclass
bInterfaceProtocol 0 None
iInterface 0
HID Device Descriptor:
bLength 9
bDescriptorType 33
bcdHID 1.11
bCountryCode 0 Not supported
bNumDescriptors 1
bDescriptorType 34 Report
wDescriptorLength 98
Report Descriptors:
** UNAVAILABLE **
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x83 EP 3 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0020 1x 32 bytes
bInterval 2
Device Status: 0x0000
(Bus Powered)
[/code]

[p]dmesg[/p]
[code][144778.649419] usb 3-2: new full-speed USB device number 78 using xhci_hcd
[144778.816720] usb 3-2: New USB device found, idVendor=046d, idProduct=c52b
[144778.816725] usb 3-2: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[144778.816727] usb 3-2: Product: USB Receiver
[144778.816729] usb 3-2: Manufacturer: Logitech
[144778.826690] logitech-djreceiver 0003:046D:C52B.000A: hiddev0,hidraw0: USB HID v1.11 Device [Logitech USB Receiver] on usb-0000:00:14.0-2/input2
[144778.878759] input: Logitech Unifying Device. Wireless PID:4017 as /devices/pci0000:00/0000:00:14.0/usb3/3-2/3-2:1.2/0003:046D:C52B.000A/0003:046D:C52B.000B/input/input43
[144778.879129] logitech-djdevice 0003:046D:C52B.000B: input,hidraw1: USB HID v1.11 Mouse [Logitech Unifying Device. Wireless PID:4017] on usb-0000:00:14.0-2:1
[/code]

[h1]Logitech Wireless Keyboard K400 Plus[/h1]
[b]Works perfectly out of the box[/b] on Trisquel 7.0 (Linux 3.13.0-39-lowlatency):
[list]
Mute and volume buttons work perfectly.
[/list]

[list]Yellow mouse button (located above ESC) works perfectly (i.e., as an additional left mouse button).
[/list]

[h1]Logitech Wireless Trackball ERGO M575[/h1]
[enum]
[list]Year of commercialization: 2020[/list]
[list]Still produced: Yes[/list]
[list]Compatible wireless receiver: Unifying USB Receiver (included), Bluetooth[/list] (included) with unencrypted connection, Bluetooth with encrypted connection[/list]
[list]Tested on: Trisquel 11[/list]
[list]Does it work with free software?: Yes[/list]
[list]Note: Worked with both the Unifying USB Receiver, and Bluetooth[/list]
[/enum]

[h1]No longer produced[/h1]

[h2]Logitech Wireless Trackball M570[/h2]
[enum]
[list]Year of commercialization: 2010[/list]
[list]Still produced: No[/list]
[list]Compatible wireless receiver: Unifying USB Receiver (included)[/list] (included) with unencrypted connection[/list]
[list]Tested on: Trisquel 11[/list]
[list]Does it work with free software?: Yes[/list]
[/enum]

[h1]Distro specific configurations[/h1]

[h2]Experience With Gnewsense-Parkes[/h2]

[p]If this receiver-wireless keyboard solution is used as the primary method of data entry in a setup in which the root mount point is inside an encrypted partition, the receiver doesn't work between its use in the Grub Menu and the loading of the modules by the Operating System, preventing the decryption password from being entered, stopping loading of the Operating System. In order to fix that, append these lines to [b]/etc/initramfs-tools/modules[/b][/p]:
[code]hid_logitech
hid_logitech_dj
#One of the above may not be alway be required and my produce a warning
[/code]

And per instructions on the file itself, one must run [b]update-initramfs [/b] for the change to take effect.
If the changes didn't seem to take effect, verify that the kernel configuration file in /boot/ have the following values equal to "m" as in "module".
CONFIG_HID_LOGITECH=m
CONFIG_HID_LOGITECH_DJ=m
[/p]