This bug was fixed in the package upower - 0.99.8-2ubuntu0.1
---------------
upower (0.99.8-2ubuntu0.1) cosmic; urgency=medium
* debian/patches/git_access_sys.patch:
- Fix upower's keyboard backlight support (lp: #1796550)
-- Sebastien Bacher <seb...@ubuntu.com> Thu, 25 Oct 2018 13:31:01
+0200
** Changed in: upower (Ubuntu)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1796550
Title:
[regression] Keyboard brightness control keys (down/up) don't work in
cosmic (upower 0.99.8)
Status in linux package in Ubuntu:
Invalid
Status in upower package in Ubuntu:
Fix Released
Status in upower source package in Cosmic:
Fix Committed
Bug description:
* Impact
keyboard backlight control keys don't work in cosmic
* Test case
On a laptop with keyboard backlight and keys to control the level, try using
the keys, they should change the level
* Regression potential
The change is to lift some systemd process restriction, have extra access
shouldn't create issue but check that other features like suspend, battery
pourcentage report, etc keep working
-----------------------
https://gitlab.freedesktop.org/upower/upower/issues/73
---
On laptops with two separate (down,up) keys to control the backlit
keyboard, both keys seem to do nothing. The OSD for the backlit
keyboard is displayed but no progress bar and no actual effect to the
backlight. Almost as if the shell only understands laptops with a
single key for controlling the keyboard backlight...
Bug verified in cosmic on:
* Asus UX331UAL
* Apple Macbook Pro 12,1
* Apple Macbook Air
All of them have these keys and they all fail in the same way. However
it is not a kernel bug. The kernel interface
(/sys/class/leds/*::kbd_backlight/*) works when I write to it
directly. This seems to be a problem with Gnome Shell only.
ProblemType: Bug
DistroRelease: Ubuntu 18.10
Package: gnome-shell 3.30.0-3ubuntu1
ProcVersionSignature: Ubuntu 4.18.0-8.9-generic 4.18.7
Uname: Linux 4.18.0-8-generic x86_64
ApportVersion: 2.20.10-0ubuntu11
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Sun Oct 7 13:41:50 2018
DisplayManager: gdm3
InstallationDate: Installed on 2018-09-11 (25 days ago)
InstallationMedia: Ubuntu 18.10 "Cosmic Cuttlefish" - Alpha amd64 (20180822)
SourcePackage: gnome-shell
UpgradeStatus: No upgrade log present (probably fresh install)
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