Hi, unfortunately not. Maybe it will get fixed sometime.

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https://bugs.launchpad.net/bugs/1872311

Title:
  Brightness hotkeys not working on Lenovo S740

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Brightness hotkeys (Fn + F11 for decrease and Fn + F12 for increase)
  do not work on Ubuntu 20.04 and Lenovo S740 laptop. The brightness
  hotkeys did not work on 19.10 either.

  I followed the guide here:
  https://wiki.ubuntu.com/Hotkeys/Troubleshooting

  In "Step-by-step Troubleshooting", none of the steps (1-7) did produce
  any reaction to brightness change key combinations. However, I am able
  to change the laptop screen brightness through the brightness applet.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: linux-image-5.4.0-21-generic 5.4.0-21.25
  ProcVersionSignature: Ubuntu 5.4.0-21.25-generic 5.4.27
  Uname: Linux 5.4.0-21-generic x86_64
  ApportVersion: 2.20.11-0ubuntu26
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  elias      1447 F.... pulseaudio
   /dev/snd/controlC0:  elias      1447 F.... pulseaudio
  CasperMD5CheckResult: skip
  CurrentDesktop: ubuntu:GNOME
  Date: Sun Apr 12 16:12:01 2020
  InstallationDate: Installed on 2019-11-19 (144 days ago)
  InstallationMedia: Ubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017)
  MachineType: LENOVO 81RS
  ProcFB: 0 i915drmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-21-generic 
root=UUID=101c7da4-860d-4496-ae06-d98699795f9a ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-5.4.0-21-generic N/A
   linux-backports-modules-5.4.0-21-generic  N/A
   linux-firmware                            1.187
  SourcePackage: linux
  UpgradeStatus: Upgraded to focal on 2020-04-04 (7 days ago)
  dmi.bios.date: 03/10/2020
  dmi.bios.vendor: LENOVO
  dmi.bios.version: BYCN33WW
  dmi.board.asset.tag: NO Asset Tag
  dmi.board.name: LNVNB161216
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0J40709 WIN
  dmi.chassis.asset.tag: NO Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Lenovo Yoga S740-14IIL
  dmi.modalias: 
dmi:bvnLENOVO:bvrBYCN33WW:bd03/10/2020:svnLENOVO:pn81RS:pvrLenovoYogaS740-14IIL:rvnLENOVO:rnLNVNB161216:rvrSDK0J40709WIN:cvnLENOVO:ct10:cvrLenovoYogaS740-14IIL:
  dmi.product.family: Yoga S740-14IIL
  dmi.product.name: 81RS
  dmi.product.sku: LENOVO_MT_81RS_BU_idea_FM_Yoga S740-14IIL
  dmi.product.version: Lenovo Yoga S740-14IIL
  dmi.sys.vendor: LENOVO

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