nvidia - Ubuntu 16.0.4.1 brightness only working after sleep - Ask Ubuntu


i have tried several of fixes on here brightness on asus g55vw laptop nvidia 660m. brightness , fn keys control brightness both working now. problem have whenever first boot, brightness not work. work after put laptop sleep, bring out. once that, works perfectly. i'm not sure i'm missing on boot causing not to work, , i'm not sure coming out of sleep doing cause to work.

you need change how system identifies bios. fortunately, pretty simple:

  1. in terminal, run:

    sudo nano /etc/default/grub

  2. find line says grub_cmdline_linux_default.

  3. before second quote, add acpi_osi= acpi_osi= acpi_backlight=native pcie_aspm=force. should when you're done:

    grub_cmdline_linux_default="quiet splash acpi_osi= acpi_backlight=native pcie_aspm=force"

  4. run sudo update-grub , reboot. brightness buttons should work natively.

this (likely) bug on both asus' , linux's end, 2 won't talk each other normally. therefore, if tell linux identify in different way normal, asus bios things in such way linux can understand , expect.


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