The brightness of laptop screen cannot be adjusted with either the buttons or the slider. Edit
I created a temporally bash script to adjust brightness level. Then I create 2 sortcuts at keyboard mapping settings to set up CTRL + Brightness UP or CTRL + Brightness Down with this script:
#!/bin/bash
# Step brightness value
STEP=2
# Max brightness value (defult 100)
MAX=100
# Min brightness value (defult 0)
MIN=0
COMMAND=$(xrandr --verbose | grep -i brightness | cut -f2 -d':' | tr -d "[:space:]")
ACTUAL=$(bc -l <<< $COMMAND*100 | cut -f1 -d'.')
while getopts ": u d" input
do
case $input in
u) if [ $ACTUAL -lt $MAX ];then
TOTAL=$(bc -l <<< $(($ACTUAL+$STEP))/100)
$(xrandr --output DP-0 --brightness $TOTAL)
fi;;
d) if [ $ACTUAL -gt $MIN ];then
TOTAL=$(bc -l <<< $(($ACTUAL-$STEP))/100)
$(xrandr --output DP-0 --brightness $TOTAL)
fi;;
?) printf "Usage: brightness [OPTION]\n"
printf "Increase or decrease birghtness on Ubuntu Xorg.\n"
printf "WAYLAND MUST BE DISABLED\n\n"
printf " -u\t Increases brightness\n"
printf " -d\t Decreases brightness\n"
exit 2;;
esac
done
And in set custom shortcut I added this
NVIDIA doesn't work with Wayland
As others have discovered, nVidia doesn't play well with Wayland: Ubuntu 17.10 on Wayland - (How) can I install the NVIDIA drivers?. The solution is to switch to Xorg. To summarize the answer from cl-net use these steps:
To install the NVIDIA drivers, execute
sudo apt install nvidia-384
.Additionally you can force the GDM login screen to use Xorg by default.
To achieve this, just executesudo nano /etc/gdm3/custom.conf
.
Remove the character#
from the line# WaylandEnable=false
.
Now press Ctrl+X, then Y and Enter to save that change.Restart the Ubuntu operating system, execute
sudo reboot
.
Another problem you will likely encounter is no sound over HDMI to external monitor. To solve this problem see this Q&A: No Audio Over HDMI on NVIDIA GeForce GTX 1050 Ti
It looks like Linux might recognize your backlight. Do you see a brightness
file in /sys/class/backlight/acpi_video0/
? If you do, try writing a number into it and see if it affects the brightness of your screen. You might need to do so as root.
On my system, the Fn+Brightness keys aren't even recognized by Linux in that they don't generate any scancodes, but I can still vary the brightness of my display by giving all users access to the brightness
file with chmod
and writing integers into it.