- gksudo vi /etc/default/grub
1. way
Change to: GRUB_CMDLINE_LINUX_DEFAULT="quiet splash pcie_aspm=force acpi_backlight=vendor"
2. way
Locate : GRUB_CMDLINE_LINUX=""
Change to: GRUB_CMDLINE_LINUX="acpi_osi=Linux acpi_backlight=vendor"
Then again in your terminal:
- sudo update-grub