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I'm slowly working through all the defects on a plain-vanilla Ubuntu 16.10 install on this machine but this one has me stumped. My screen brightness hotkeys, Fn-F5 and Fn-F6, worked fine on Ubuntu 16.04 but now that I've done a clean install of Ubuntu 16.10 they don't work.

Here's what I know:

  • screen brightness is addressable by the kernel (/sys/class/backlight/intel_backlight/), desktop tools such as Redshift and adjusting brightness with the slider in the config panel works fine, as does command-line adjusting: echo 1000 | sudo tee /sys/class/backlight/intel_backlight/brightness
  • I can see them in evtest in the listing for the device "Asus WMI Hotkeys" ("Event code 224 (KEY_BRIGHTNESSDOWN)" and "Event code 225 (KEY_BRIGHTNESSUP)"), however pressing the keys doesn't generate key events.
  • The keys do work in the BIOS and in GRUB, but once the kernel starts the key events don't seem to be seen.
  • I've tried kernel params "acpi_osi=", "acpi_osi=Linux", "acpi_osi=Windows" with no luck (although that definitely disabled some stuff, according to evtest)

I know this worked under Linux because it worked under Ubuntu 16.04. Any suggestions for my next debugging step?

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  • I have the same issue. Did you fin something?
    – jics
    Apr 20, 2017 at 4:00
  • I didn't. I kept digging until it started to look like a systemd problem, and spending weeks in that nightmare trying to figure it out didn't seem worth the effort. I managed to get by with a combination of RedShift with the settings WAY down and the occasional manual nudge in the control panel. Apr 21, 2017 at 5:28
  • The last thing I found it was when I run evtest I did see an event called Asus WMI Hotkeys and the keycodes were in this event like you. But nothing more :(
    – jics
    Apr 24, 2017 at 21:07
  • Finally I installed Ubuntu gnome with kernel 4.10 and every works fine.
    – jics
    Apr 26, 2017 at 12:53

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