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Having a new Acer Aspire E17 E5-773G with Ubuntu 16.04 on it, I experience that the keyboard combinations to adjust volume (Fn + /) and brightness (Fn + /) do not work on the login screen or lock screen.

They do work when logged in though, so it's not a general problem. What do I have to do to be able to use them from the login and lock screen as well?

  • possible duplicated ?? askubuntu.com/questions/122903/… – Mohamed Slama Jun 1 '16 at 0:25
  • I don't know if that helps someone to answer but on my Ubuntu-MATE I have the same problem. I noticed that when I right click on destkop or on some applications like caja, then adjusting brightness with the Fn keys doesn't work (while disabling wifi works) so it's like the pop up from right click blocks some Fn functionality but when I right click for example at chromium then it works just fine. Can you tell me the behavior when you right click on your desktop to see if it's somehow connected? – Thanos Apostolou Jun 1 '16 at 13:10
  • @ThanosApostolou I could not reproduce your described behaviour. – Byte Commander Jun 1 '16 at 17:11
  • On Ubuntu GNOME I have this ability by default. Don't know about Unity though. – user364819 Jul 2 '16 at 22:51
  • Ubuntu 18.4 LTS with budgie DE, same problem. It's a real pain... – Shautieh Sep 4 '18 at 21:43
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In the terminal:

sudo gedit /etc/default/grub

Change

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

to

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi="

Save, then

sudo update-grub

Restart computer.

| improve this answer | |
  • I made the edit and updated GRUB, but there was no change. I still can't change the volume and brightness using my Fn keys from the log-in screen. I even confirmed that the change was active from the GRUB menu. It does not work. :-( – Byte Commander Jun 1 '16 at 12:05
  • Set GRUB_CMDLINE_LINUX_DEFAULT to "quiet splash acpi_osi=Linux" and test again. – Ghasem Pahlavan Jun 1 '16 at 16:07
  • I just tried that, but without luck. No observable changes either, the volume/brightness key combinations still don't work. – Byte Commander Jun 1 '16 at 17:01
  • try this config: GRUB_CMDLINE_LINUX_DEFAULT="quiet acpi_backlight=vendor splash acpi_osi=linux" – Ghasem Pahlavan Jun 1 '16 at 17:13
  • 1
    I have already tried this without luck as well. – Byte Commander Jun 1 '16 at 17:13

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