I'm new to linux and this is my first installation of ubuntu 20.04 on ASUS ROG ZEPHYRUS G14 laptop. After installation, I can't change the screen brightness and my screen always show the highest screen brightness. After some time of changing grub in ubuntu forum, this is my attempts
- Add
acpi_brightness=vendor
oracpi_backlight=native
oracpi_backlight=native
oracpi_backlight=none
to grubetc/default/grub
still not working - After that I installed brightness-controller-simple and brightness-controller and slide the brightness control to minimum and my screen brightness stays the same
- I installed xbacklight and run this command
xbacklight -set 50
still didn't work
Note : I manged to install nvidia drivers on my laptop after using nouveau for 2 days
and this is my result after run this command ls /sys/class/backlight/acpi_video0
>>> actual_brightness brightness max_brightness scale type bl_power device power subsystem uevent
My laptop specs : CPU : AMD Ryzen 7 4800HS GPU : NVIDIA GeForce GTX 1650 Ti 4GB GDDR6 RAM : 16 GB Kernel : Linux 5.4.0-42-generic #46-Ubuntu SMP Fri Jul 10 00:24:02 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
xrandr --output LVDS1 --brightness 0.5
? (If it dulls your screen too much, reset it withxrandr --output LVDS1 --brightness 1
. This isn't really a solution, I just want to see if it dims and we can go from there (maybe). If you're curious, each0.1
is equal to 10% brightness, so 0.0 = 0% and 1 = 100%. LVDS1 is standard laptop display, but there's also DVI1 (and DVI2), HDMI1, DP1, and VGA1.xrandr: Failed to get size of gamma for output default warning: output LVDS1 not found; ignoring xrandr: Need crtc to set gamma on.
xrandr --output LVDS1 --brightness 1 or 0.5 xrandr: Failed to get size of gamma for output default warning: output LVDS1 not found; ignoring xrandr: Need crtc to set gamma on.