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This change has been made by an automated script, maintained by the
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** Changed in: linux (Ubuntu)
Status: New => Incomplete
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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:
Incomplete
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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