Kai-Heng: I just tested your kernel, but it didn't solve the keyboard
issue. However, it seemed to screw up the mouse, which of course has the
same vendor and device id, since they operate through the same usb
connector. With this kernel the mouse was making large erratic jumps and
generating click events when I was just moving the mouse.

Is it possible that the fix was somehow modifying the report data coming
from the mouse instead of the report data coming from the keyboard?

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https://bugs.launchpad.net/bugs/1771431

Title:
  Lenovo Essential Wireless Keyboard doesn't works (Primax Electronics
  manufacturer)

Status in linux:
  Confirmed
Status in linux package in Ubuntu:
  Triaged
Status in linux package in Fedora:
  Unknown

Bug description:
  Hi
  I got an issue on Ubuntu 18.04 with latest packages.
  uname -a:
  Linux MyLaptop 4.15.0-20-generic #21-Ubuntu SMP Tue Apr 24 06:16:15 UTC 2018 
x86_64 x86_64 x86_64 GNU/Linux

  lshw:
                *-usb:0
                     description: Keyboard
                     product: Lenovo USB Receiver
                     vendor: Lenovo
                     physical id: 3
                     bus info: usb@1:3
                     version: 1.05
                     capabilities: usb-2.00
                     configuration: driver=usbhid maxpower=100mA speed=12Mbit/s

  My wireless keyboard is not working, Ubuntu only recognize some
  special keys (Super, Ctrl, Shift, Alt)

  This is a Mouse+Keyboard combo using a wireless receiver by usb:

  lsusb:
  Bus 001 Device 005: ID 17ef:609b Lenovo

  Mouse works fine, and in Windows 10 it works with no issues.

  I found multiple reported problems with this keyboard in other distros (and 
from Asus too, as the real manufacturer is Primax Electronics).
  
https://forums.lenovo.com/t5/Linux-Discussion/Professional-Wireless-Keyboard-not-working-on-Linux/td-p/3726486
  https://ubuntuforums.org/showthread.php?t=2378862
  
https://askubuntu.com/questions/897729/lenovo-professional-wireless-keyboard-and-mouse-combo-not-working-in-ubuntu
  
https://forums.linuxmint.com/viewtopic.php?f=49&t=260093&sid=20a073d5dd8abb1b7f23be608d7fdfd7
  
https://unix.stackexchange.com/questions/377830/linux-hid-driver-for-primax-wireless-keyboards/

  REPORTS ON KERNEL MAILING LISTS:
  https://www.spinics.net/lists/linux-usb/msg168719.html
  https://www.spinics.net/lists/linux-input/msg56210.html
  https://www.spinics.net/lists/linux-usb/msg173012.html
  https://www.spinics.net/lists/linux-input/msg58221.html

  There is a workaround (I still didn't tried) but it needs to compile an 
specific driver.
  https://github.com/y-trudeau/linux_lenovo_ultraslim_plus

  There is already a kernel report about this.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: linux-generic 4.15.0.20.23
  ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
  Uname: Linux 4.15.0-20-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  julian     1342 F.... pulseaudio
  CurrentDesktop: ubuntu:GNOME
  Date: Tue May 15 15:53:41 2018
  InstallationDate: Installed on 2018-05-14 (1 days ago)
  InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
  MachineType: LENOVO 20FJS0NT07
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-20-generic 
root=UUID=818481db-36cb-4dba-8da5-8ecf15750b3b ro noapic acpi=off vt.handoff=1
  RelatedPackageVersions:
   linux-restricted-modules-4.15.0-20-generic N/A
   linux-backports-modules-4.15.0-20-generic  N/A
   linux-firmware                             1.173
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 03/27/2018
  dmi.bios.vendor: LENOVO
  dmi.bios.version: N1KET38W (1.25 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20FJS0NT07
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0J40705 WIN
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
  dmi.modalias: 
dmi:bvnLENOVO:bvrN1KET38W(1.25):bd03/27/2018:svnLENOVO:pn20FJS0NT07:pvrThinkPadT560:rvnLENOVO:rn20FJS0NT07:rvrSDK0J40705WIN:cvnLENOVO:ct10:cvrNone:
  dmi.product.family: ThinkPad T560
  dmi.product.name: 20FJS0NT07
  dmi.product.version: ThinkPad T560
  dmi.sys.vendor: LENOVO

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