Ubuntu
xserver-xorg-input-evdev package

  1. Bug #1042359
  2. Comment #3

Comment 3 for bug 1042359

Revision history for this message
Stéphane Gourichon (stephane-gourichon-lpad) wrote : Re: Partially broken brightness hotkey handling.

One more specific information : in bare OpenBox X session, none of these keys have a visible effect handled by Ubuntu, except XF86WLAN.

Also, this laptop was sold with Windows, and there all function keys work, including the brightness keys.

## kernel-level showkey test

I've tried https://wiki.ubuntu.com/Hotkeys/Troubleshooting but it seems outdated.
No gconf-editor, used dconf-editor instead. Tree paths do not exist, /usr/share/doc/udev/README.keymap.txt does not exist.

Anyway, following https://wiki.ubuntu.com/Hotkeys/Architecture I tested showkey.
Fn-* combinations produced scancodes, except for the 3 malfunctioning brightness key combinations.

## acpi-level test

Killing acpid would see it respawned immediately, so I moved the executable away for test.
Suspend button yields acpi events, but not brightness buttons.

$ sudo cat /proc/acpi/event
button/sleep SLPB 00000080 0000000a
battery BAT0 00000081 00000001
ac_adapter AC0 00000080 00000001
button/power PWRB 00000080 00000001

## Now what ?

This suggests that the problem should be fixed at kernel level, but it looks like kernel is never aware about those keypresses.

https://wiki.ubuntu.com/Hotkeys/Troubleshooting says :

> if there is neither an ACPI event nor an input event, this is probably also a kernel bug, though probably harder to diagnose (WMI, perhaps?)

I'm clueless now. Thank you for any hint.