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  • Posts: 1
  • Registered: ‎11-26-2019
  • Location: TR
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Cannot change brightness leves on Ubuntu 18.04 (Yoga S740)

2019-11-26, 18:42 PM

I am suffering from extreme brightness on Ubuntu 18.04. I have recently downloaded this version, however my brightness keys are not working and I cannot change the brightness levels. My PC is Lenovo Yoga S740.

xrandr is not working I have tried it before. It gives me this error:

xrandr: Failed to get size of gamma for output default

Also this does not give any output:

ls /sys/class/backlight/

I have also tried to change the grub file but nothing is working for me. (I also tried to change it as acpi_backlight=video etc.)

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"

Finally, xbacklight doesn't work too. How can I solve this issue?

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