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I have both Windows 10 & Ubuntu 18.04.04 LTS installed on my Lenovo Legion Y740-15IRHg, with a dual boot setup. I also have Nvidia 440 driver installed.

Currently I'm having issue with controlling my brightness on Ubuntu. Here are a few approaches I tried and none of them worked out.

  1. Modifying /sys/class/backlight/intel_backlight/brightness directly
  2. Updating acpi_backlight argument in Grub's config GRUB_CMDLINE_LINUX_DEFAULT to vendor, video & native
  3. Using xbacklight

Anyone has any idea how to get this resolved? Thanks in advance.

Jeff Happily
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