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Last active December 18, 2020 22:41
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intel_backlight.md

How to increase and decrease the backlight on Lenovo Z500 with Ubuntu 20.04

Source

  1. Open /etc/default/grub
  2. Change
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

to

GRUB_CMDLINE_LINUX_DEFAULT="quiet fastboot acpi_osi=Linux acpi_backlight=vendor"

and then you can change the brightness doing

sudo sh -c "echo 2 > /sys/class/backlight/ideapad/brightness"

Here we are using the ideapad symlink not the intel_backlight. At least that's what's worked for me.

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