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Message #78719
[Bug 1349002] Re: Screen brightness cannot be changed on HP EliteBook 8560w
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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https://bugs.launchpad.net/bugs/1349002
Title:
Screen brightness cannot be changed on HP EliteBook 8560w
Status in “linux” package in Ubuntu:
Confirmed
Bug description:
I cannot change the screen brightness on my HP Elitebook 8560w. If I use the keys for changing the screen brightness (fn + f9 or fn + f10), the on-screen display appears and the displayed percentage changes as intended but the actual screen brightness does not change (i.e. it remains at full brightness). Similarly, if I do not use my computer for some time, the on-screen display appears and indicates the the screen brightness is reduced (lower percentage) but the actual screen brightness remains unchanged (at full brightness). I have this computer since November 2011 and I had always the latest Kubuntu version installed. Changing the screen brightness always worked until and including Kubuntu 13.10. However, it stopped working when I upgraded to Kubuntu 14.04. I have upgraded my computer's BIOS to the latest version (F.42) but this did not help. As I also experience another bug (1337579) with Kubuntu 14.04, I have upgraded the kernel to the upstream kernel (3.14.4-031404) and a mainline kernel (3.16.0-031600rc6) but the bug occurs with all three kernel versions.
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ApportVersion: 2.14.1-0ubuntu3.2
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: ubuntu 3663 F.... pulseaudio
/dev/snd/controlC0: ubuntu 3663 F.... pulseaudio
CasperVersion: 1.340
CurrentDesktop: Unity
DistroRelease: Ubuntu 14.04
LiveMediaBuild: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
MachineType: Hewlett-Packard HP EliteBook 8560w
Package: linux (not installed)
ProcEnviron:
TERM=xterm
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcFB: 0 nouveaufb
ProcKernelCmdLine: noprompt cdrom-detect/try-usb=true persistent file=/cdrom/preseed/username.seed boot=casper initrd=/casper/initrd.lz quiet splash -- maybe-ubiquity
ProcVersionSignature: Ubuntu 3.13.0-32.57-generic 3.13.11.4
RelatedPackageVersions:
linux-restricted-modules-3.13.0-32-generic N/A
linux-backports-modules-3.13.0-32-generic N/A
linux-firmware 1.127.5
Tags: trusty
Uname: Linux 3.13.0-32-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
_MarkForUpload: True
dmi.bios.date: 07/15/2013
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: 68SVD Ver. F.42
dmi.board.name: 1631
dmi.board.vendor: Hewlett-Packard
dmi.board.version: KBC Version 01.3D
dmi.chassis.type: 10
dmi.chassis.vendor: Hewlett-Packard
dmi.modalias: dmi:bvnHewlett-Packard:bvr68SVDVer.F.42:bd07/15/2013:svnHewlett-Packard:pnHPEliteBook8560w:pvrA0001D02:rvnHewlett-Packard:rn1631:rvrKBCVersion01.3D:cvnHewlett-Packard:ct10:cvr:
dmi.product.name: HP EliteBook 8560w
dmi.product.version: A0001D02
dmi.sys.vendor: Hewlett-Packard
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