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I disabled Secure Boot in BIOS and reinstalled Ubuntu 18.10. I followed the steps described in the following link to modify the grub. However, after executing sudo update-grub and rebooted the system, I still cannot change the brightness using the function keys.

Brightness key not working Ubuntu 16.04 LTS

lovedrinking
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  • @lovedrinking See thinkwiki for possible solutions - [special keys](https://www.thinkwiki.org/wiki/How_to_get_special_keys_to_work) and [LCD Brightness](https://www.thinkwiki.org/wiki/LCD_Brightness). It should work if correctly set-up. But I think that it should work out-the-box. ThinkPads are linux-friendly. – N0rbert Oct 27 '18 at 08:11
  • How come? Is there a way to make the brightness keys work? I installed the latest Nvidia driver but it doesn’t help. – lovedrinking Oct 27 '18 at 08:31
  • Any resolution? I've seen people mention that it works on PopOS!, which is an Ubuntu derivative, so I wonder why it doesn't work on Ubuntu. – Ibrahim Nov 07 '18 at 07:34
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    I installed Ubuntu 18.10 and then installed the automatically suggested nVidia proprietary drivers using `ubuntu-drivers autoinstall` in recovery mode, and my brightness keys work fine. I also switched to LightDM instead of GDM3 but that was more because locking the screen was not working properly with GDM3, I think the brightness keys still worked. I also have the 4k screen. – Ibrahim Nov 09 '18 at 08:07
  • with ubuntu 18.04 on the X1 extreme I installd `sudo ubuntu-drivers autoinstall` as mentioned by @Ibrahim and rebooted. (I noticed it was a little dim) The screen got brighter, but the function keys for brightness still don't work. – monkut Feb 11 '19 at 04:53

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Ok, I've figured it out for me, at least with ubuntu 18.04 as of 2/11/2019.

  1. Install ubuntu nvidia drivers:

    # use auto-install (as mentioned by @Ibrahim)
sudo ubuntu-drivers autoinstall

  2. Edit the GRUB_CMDLINE_LINUX_DEFAULT entry in the /etc/default/grub to the following:

    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash nvidia.NVreg_EnableBacklightHandler=1"

  3. Update grub configuration after edit and save:

    sudo update-grub

  4. Reboot:

    sudo reboot
monkut
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  • ```sudo ubuntu-drivers autoinstall``` and a reboot worked for me after upgrade 20.04 to 22.04 with Lenovo Thinkpad X1 Extreme – ThurstonLevi Jun 01 '22 at 07:29