Brightness hotkeys(Fn+F5 for decrease and Fn+F6 for Increase) are not working on Ubuntu 20.04. Hardware Lenovo Ideapad-5-15ITL05

[akash rayhan]

I used the command "watch -n1 cat /proc/interrupts". But when i pressed the brightness hot keys id didn't increased the interruptions. I also used the "acpi_listen" at that time it didn't feedback any output when i pressed the brightness hotkeys. Again I used "sudo showkey -s" it also didn't feedback any output.
But it was working on windows 10.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: linux-image-5.10.0-1034-oem 5.10.0-1034.35
ProcVersionSignature: Ubuntu 5.10.0-1034.35-oem 5.10.41
Uname: Linux 5.10.0-1034-oem x86_64
ApportVersion: 2.20.11-0ubuntu27.18
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Sun Jun 27 19:30:42 2021
InstallationDate: Installed on 2021-06-27 (0 days ago)
InstallationMedia: Ubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
SourcePackage: linux-signed-oem-5.10
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Po-Hsu Lin (cypressyew)]

Hi,
5.10 OEM kernel is no longer supported, please give 5.14 OEM kernel a try.