The only thing that works is xrandr -output DP-2 -brightness 1 but that is not a solution since the backlight brightness isn't actually being changed, it just ramps the gamma. Sudo tee /sys/class/backlight/acpi_video0/brightness <<< 5 has no effect Ls /sys/class/backlight shows only acpi_video0 Tried updating /etc/default/grub acpi_backlight=, no luck.
#Lenovo brightness control drivers#
Nvidia drivers tested: nouveau, 430, 435, 440 Here is a list of some of the things I tried and didn't work: This means that I only have my RTX 2060 discrete GPU and I'm not able to chose switchable graphics since there is nothing else to switch into. Sadly, my processor is the i7-9750HF variant, which does not include an integrated GPU (that's the meaning of the F part). This is a huge issue since I work at night and the 300 nits of the screen are burning my eyes, making the laptop unusable while also draining the battery.īrightness control keys don't work on Lenovo Y540 but xrandr doesīrightness adjustment not working on Lenovo Y540 īut everyone seem to have "fixed" their issue the same way: by changing the bios settings from discrete graphics to switchable graphics. I've observed the same behavior on 4 different Linux distributions (mint, manjaro, debian, ubuntu), they show ACPI errors on boot (link of a picture: edit: this seems to be an unrelated and harmless bug reported and marked as won't fix on ) and then the systems works fine, but I can't control the screen brightness that is stuck at 100%.
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