Public bug reported:

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's working on windows

** Affects: linux-oem-5.10 (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1933761

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

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