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I just upgraded to ubuntu 17.10 and now display brightness controls are not working, and i am not able to change display brightness at all. But it was working perfectly in 17.04

I also tried this method, but still not working. When I saw system details, it shows unknown graphics.

Section "Device"
        Identifier  "card0"
        Driver      "intel"
        Option      "Backlight"  "intel_backlight"
        BusID       "PCI:0:2:0"
EndSection

What can I do now?

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1 Answer 1

Reset to default
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  1. Open a terminal by pressing Ctrl+Alt+T

  2. Edit the /etc/default/grub file by running:

    sudo nano /etc/default/grub

  3. Change the GRUB_CMDLINE_LINUX_DEFAULT line to:

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

  4. Press Ctrl+O to save

  5. Press Ctrl+X to exit

  6. Update GRUB by running:

    sudo update-grub

  7. Reboot

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  • 2
    You should never use normal sudo to start graphical applications, use nano or sudo -H gedit instead.
    – pomsky
    Commented Nov 2, 2017 at 21:46
  • Thanks it works..;) old approach like 16.04 is not working for me but you made it!
    – Jay Patel
    Commented Dec 9, 2017 at 14:23
  • …or xhost +si:localuser:root
    – David Foerster
    Commented Feb 21, 2018 at 11:31
  • 1
    Didn't work for me.
    – Akeshwar Jha
    Commented Mar 25, 2018 at 12:30
  • Perfect - simple and clear instructions, worked for me
    – dr mat
    Commented Apr 14, 2018 at 21:08

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