The output from "libinput debug-events" looks okay:
 event4   KEYBOARD_KEY      +6.48s      KEY_UNKNOWN (240) pressed
-event8   KEYBOARD_KEY      +6.49s      KEY_RFKILL (247) pressed
 event8   KEYBOARD_KEY      +6.49s      KEY_RFKILL (247) released

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https://bugs.launchpad.net/bugs/1823653

Title:
  Wireless key does not work on Dell G7 7588 with Bionic

Status in linux-signed package in Ubuntu:
  New

Bug description:
  The wireless key (fn + PrtScn) does not work on this system.

  "sudo showkey -s" does not return anything
  But it will generate some noise in dmesg:
  [ 1863.388925] keyboard: can't emulate rawmode for keycode 240
  [ 1863.408641] keyboard: can't emulate rawmode for keycode 247
  [ 1863.408667] keyboard: can't emulate rawmode for keycode 247

  
  "sudo showkey -k" will show:
  keycode 240 press
  keycode 247 press
  keycode 247 release

  xev returns:
  KeyPress event, serial 37, synthetic NO, window 0x2800001,
      root 0x263, subw 0x0, time 1542623, (357,334), root:(547,505),
      state 0x10, keycode 255 (keysym 0x0, NoSymbol), same_screen YES,
      XLookupString gives 0 bytes:
      XmbLookupString gives 0 bytes:
      XFilterEvent returns: False

  KeyRelease event, serial 37, synthetic NO, window 0x2800001,
      root 0x263, subw 0x0, time 1542623, (357,334), root:(547,505),
      state 0x10, keycode 255 (keysym 0x0, NoSymbol), same_screen YES,
      XLookupString gives 0 bytes:
      XFilterEvent returns: False

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: linux-image-4.15.0-47-generic 4.15.0-47.50
  ProcVersionSignature: Ubuntu 4.15.0-47.50-generic 4.15.18
  Uname: Linux 4.15.0-47-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.9-0ubuntu7
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Mon Apr  8 15:58:37 2019
  InstallationDate: Installed on 2019-04-08 (0 days ago)
  InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
  SourcePackage: linux-signed
  UpgradeStatus: No upgrade log present (probably fresh install)

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