English Community

Linux Operating SystemsUbuntu
All Forum Topics
Options

1 Posts

11-26-2019

TR

1 Signins

49 Page Views

  • Posts: 1
  • Registered: ‎11-26-2019
  • Location: TR
  • Views: 49
  • Message 1 of 1

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?

Reply
Forum Home

Community Guidelines

Please review our Guidelines before posting.

Learn More

Check out current deals!

Go Shop
X

Save