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@Pejek

Thanks for the detailed solution. The rollback works for my HP Elitebook 360g7 

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it worked

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even my computer HP Elitebook 840 G5 have this problem

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Yes. It's work. I am only the stop the HP Hotkey UWP Services. Then no more errors pop up again. Also, the Fn key is working fine.

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All I did was to restart the HP hotkey support service and the brightness regulation works , also pop up shows up no longer. Solved

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Bios Update to version 

01.26.00 Rev.A

Solved my issue

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Works !! Thanks !

 

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 It is a perfect solution, thank you very much!

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Updating BIOS to v01.26.00 did not fix the problem on my EB 840 G5.

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Got multiple Devices with this issue (MT45)

One whas fixed after one reboot.
The other one needed a extra reboot.

Maybe you can try that ?

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