Tried "acpi_backlight=vendor" and "video.use_native_backlight=1", the
bug still exists.

Tried to downgrade BIOS mentioned in 
https://bugs.launchpad.net/stella/hwe-stella/+bug/1023760/comments/12
Failed to reflash the BIOS.

And I can't access the BIOS mentioned in
https://bugs.launchpad.net/stella/hwe-stella/+bug/1023760/comments/24

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https://bugs.launchpad.net/bugs/1152544

Title:
  HP Envy 23 AIO - No way to dim display

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