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[Arne Henningsen <arne.henningsen@xxxxxxxxx>]

Public bug reported:

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. Further information on my
computer system is available here:

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1337579

[Unfortunately, installing the "upstream" kernel and the "mainline"
kernel did not create additional entries in the boot menu so that I
cannot choose the kernel when I (re)boot my system. As the command
'uname -a' reported the version of the upstream kernel and currently
reports the version of the mainline kernel, I assume that I ran the
upstream kernel and I am currently running the mainline kernel.
Unfortunately, I cannot report this bug with the command 'ubuntu-bug
linux', because I do not know how to boot my system with the original
kernel.]

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

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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:
  New

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.
  Further information on my computer system is available here:

  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1337579

  [Unfortunately, installing the "upstream" kernel and the "mainline"
  kernel did not create additional entries in the boot menu so that I
  cannot choose the kernel when I (re)boot my system. As the command
  'uname -a' reported the version of the upstream kernel and currently
  reports the version of the mainline kernel, I assume that I ran the
  upstream kernel and I am currently running the mainline kernel.
  Unfortunately, I cannot report this bug with the command 'ubuntu-bug
  linux', because I do not know how to boot my system with the original
  kernel.]

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