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17594
April 19th, 2019 05:00
xps-15-9570 with Ubuntu 18.04.02 LTS problem with hotkeys F11 and F12 for brightness
Just bought the laptop (about 9 months ago) I installed Ubuntu 18.04 LTS and everything was working properly, I was able to use the combinations Fn + for various features, such as volume, brightness, etc. In the meantime I continued to update Ubuntu periodically up to the version 18.04.02, and everything continued to work well.
I recently had to reinstall from scratch Ubuntu 18.04.02 LTS. Initially I had the problem of not being able to manage the brightness, neither through the hotkeys F11 and F12 nor through the control panel at the top right, (where there is also the switch-off button).
I followed the answer suggested by Ducky (here Brightness problem Ubuntu 18.04 LTS), in particular the second solution: open the file /etc/default/grub and modify the following line
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"
and this allows me to correctly change the brightness from the top right menu, but it still does not allow me to change the brightness using the Fn+F11 and Fn+F12 shortcuts.
What might it depend on?
Currently I had to create custom shortcuts that use F11 and F12 to lower and increase brightness, but I would like to go back to using the normal combination (Fn + F11 and Fn + F12) as I did before I needed to reinstall Ubuntu.
ricciolino
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April 19th, 2019 14:00
lrkwz
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November 27th, 2019 03:00
Didn't work for display brightness (XPS 15-9570 with Nvidia GeForce GTX 1650, driver nvidia-driver-435) instead it fixed the keyboard backlight.
BTW any change to /etc/default/grub should be followed by sudo update-grub command.
I resolved thanks to https://github.com/TillmannBerg/Ubuntu-Dell-XPS-15-2019 using a script to detect display and basically executing xrandr --output eDP-1 --brightness 0.6 at keyboard events (0.6 here means 60%).