Solution found by reverting(downgrading) to previous BIOS version.
** Changed in: unity-settings-daemon (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1635691
Title:
Hardware backlight / brightness keys cause erratic, stuttered and
seeming race-condition on DELL Inspiron 14-3452 (3000 series) laptop
Status in unity-settings-daemon package in Ubuntu:
Invalid
Bug description:
Symptoms appeared after clean-installing Ubuntu 16.10 or 16.04.1.
DELL Inspiron 14-3452 (3000 series) laptop
Latest BIOS ver: 4.0.11
Upon tapping, once and releasing, either the XF86monBrightnessUp or
XF86monBrightnessDown keys in a Unity-7 session, the OSD appears,
sometimes delayed, and begins to lower or raise the backlight level,
repeatedly, to the maximum or minimum level. The system comes under
load and is less responsive to any input or attempts to cancel /
counteract the action.
Manual adjustments via the echoing of numbers-in-range to the
/sys/class/backlight/intel_backlight/brightness work normally and as
expected.
Possible relation or hang-on to bug:
https://bugs.launchpad.net/ubuntu/+source/unity-settings-
daemon/+bug/1626651
ProblemType: Bug
DistroRelease: Ubuntu 16.10
Package: unity-settings-daemon 15.04.1+16.10.20161003-0ubuntu1
ProcVersionSignature: Ubuntu 4.8.0-26.28-generic 4.8.0
Uname: Linux 4.8.0-26-generic x86_64
ApportVersion: 2.20.3-0ubuntu8
Architecture: amd64
Date: Fri Oct 21 12:52:31 2016
EcryptfsInUse: Yes
InstallationDate: Installed on 2016-10-20 (1 days ago)
InstallationMedia: Ubuntu 16.10 "Yakkety Yak" - Release amd64 (20161012.2)
ProcEnviron:
TERM=xterm-256color
SHELL=/bin/bash
PATH=(custom, user)
LANG=en_US.UTF-8
XDG_RUNTIME_DIR=<set>
SourcePackage: unity-settings-daemon
UpgradeStatus: No upgrade log present (probably fresh install)
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