Edit: I later found out there is a "KDE Neon" board; I don't know how to move my post there, but I leave this to a moderator.

I recently bought an Asus UX550VD laptop, currently running KDE Neon. After fiddling with many details, I have managed to make pretty much everything work reasonably: TLP, optimus-enabled GPU, sound control, Intel microcode, etc. Still, a small detail is missing: Fn keys.

In my laptop, Fn keys control sound (mute, increase, decrease), screen brightness (off, increase, decrease), keyboard backlight (increase, decrease), dual screen and touchpad disabling. I have managed to make all work except for screen brightness control - but I am fine with that. Problem is, after suspending and resuming back, *all* Fn keys stop working.

I ran xev and acpi_listen: both confirmed that the key combinations are not being read (no change in xev/acpi_listen output following press). Changing the features managed through Fn keys is still possible (e.g. changing volume from the task bar). My /etc/default/grub is as follows:

Code: Select all

# If you change this file, run 'update-grub' afterwards to update
# /boot/grub/grub.cfg.
# For full documentation of the options in this file, see:
#   info -f grub -n 'Simple configuration'

GRUB_DEFAULT=0
#GRUB_HIDDEN_TIMEOUT=0
GRUB_HIDDEN_TIMEOUT_QUIET=true
GRUB_TIMEOUT=10
GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
GRUB_CMDLINE_LINUX_DEFAULT='pcie_port_pm=off acpi_backlight=vendor acpi_osi=Linux acpi_osi=! acpi_osi="Windows 2009"'


GRUB_CMDLINE_LINUX=""

# Uncomment to enable BadRAM filtering, modify to suit your needs
# This works with Linux (no patch required) and with any kernel that obtains
# the memory map information from GRUB (GNU Mach, kernel of FreeBSD ...)
#GRUB_BADRAM="0x01234567,0xfefefefe,0x89abcdef,0xefefefef"

# Uncomment to disable graphical terminal (grub-pc only)
#GRUB_TERMINAL=console

# The resolution used on graphical terminal
# note that you can use only modes which your graphic card supports via VBE
# you can see them in real GRUB with the command `vbeinfo'
#GRUB_GFXMODE=640x480

# Uncomment if you don't want GRUB to pass "root=UUID=xxx" parameter to Linux
#GRUB_DISABLE_LINUX_UUID=true

# Uncomment to disable generation of recovery mode menu entries
#GRUB_DISABLE_RECOVERY="true"

# Uncomment to get a beep at grub start
#GRUB_INIT_TUNE="480 440 1"
GRUB_THEME=/boot/grub/themes/breeze/theme.txt


In case it's relevant, I am using the proprietary Nvidia drivers nvidia-384, as well as bumblebee. I have tried a few other solutions (which essentially amounted to try different lines for acpi_osi ). Please let me know if further information is needed.