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01-02-2020 07:52 AM - edited 03-22-2020 03:14 PM
The model in question is HP Probook 450 G6.
The issue is that under Linux, the brightness keys (Fn+F3 and Fn+F4) do not work.
To be more specific: they work, but they do the same thing Fn+F8 is doing.
Cause: both of these key combinations return the same keycode as Fn+F8 (Mic mute) and as a result they also do the same thing.
Apparently, the issue is not isolated to this particular model and is already known for HP as can be read here:
02-24-2020 10:10 PM - edited 02-24-2020 10:13 PM
I found this topic describing the same problem. According to the last comment, updating BIOS with the driver released on January 2020 (HP firmware pack R71_sp101220.exe) may help.
02-25-2020 01:37 AM - edited 02-26-2020 02:33 AM
Please READ the description of the problem.
It has nothing to do with the graphics driver.
The laptop can increase/decrease the brightness (if using the mouse to click and select).
But the shortcut buttons on the keyboard do not work as expected.
02-26-2020 07:02 AM - edited 02-26-2020 07:15 AM
Maybe my question was vague. I want to know if that you have any further problem such as sound, wifi, microphone with your laptop running ubuntu.
It seems you have solved your troubles. If so, please mark as Accept as Solution like other posts.
04-02-2020 06:29 AM
this question is still happening with the newest bios&EC firmware updated.
the question is somehow generated by the new ACPI WPI module of HP 450 G6 ,that the new module has not been support by the up to date linux kernel.
Wandering if HP tech could provide some support for our linux USERs.