FN hotkeys not working after kernel loads (Was: Dell Latitude 5400 + plasma - keyboard?)
Still hasseling with this problem....
I am now believing, that the reason of the problem is either a BIOS issue or a
kernel issue.
Tested several things and I the issue appears as soon as the kernel is
started. In the internet I found informations, that if the BIOS does not see
Windows, it may disable several functions.
Here a kernel parameter like acpi_osi=Linux or similar should help. Tried
several combonations, lie acpi_osi=Linux or acpi_osi=!Windows 2022 or
acpi_backlight=vendor and combinations of this - but got no success.
However, it is clear, the functions like screen brightness etc. stop working,
as soon as the kernel loads. When grub is active (active here means: boot grub
menu, where to chose the kernel to start), the brightness of the screen can be
changed. But as soon I press enter, and the kernel loads, it stops working.
At that moment /usr amd /var are still not mounted (as I have to open the
encrypotion manually). This means: No configuration is involved and no other
binaries.
Thus let me conclude: It is a kernel issue with the BIOS and the only way I
see, will be to enter some parameters like described above.
However, though reading a lot of manuals, I am lost, what to set and how to
start. And in the internet I saw many many people as lost at me with the same
issue.
I have the hope, some kernel developer might read here or some specialist or
someone got into the same issue than me.
I will work on and try harder, but at the moment I am stuck.
Thanks for reading this.
Best
Hans
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