When the privacy screen functionality is enabled, I see the following
warnings in the logs:

[188829.782403] hp_wmi: Unknown event_id - 20 - 0x46fe
[188834.848948] hp_wmi: Unknown event_id - 20 - 0x3c00
[188835.624987] hp_wmi: Unknown event_id - 20 - 0x4600

The first warning is when I press the privacy screen button (fn-f2). The
second is when I press the brightness down button (fn-f3). The third is
when I press the brightness up button (fn-f4).

I do not see similar warnings after the privacy screen functionality is
turned off and I press the brightness up or down hotkeys.

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https://bugs.launchpad.net/bugs/1861521

Title:
  [FOCAL][REGRESSION] HP EliteBook 840 G5 screen brightness cannot be
  controlled

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