I have this problem on a HP Zbook 15 with kernel 3 .11.0-17-generic
#31~precise1-Ubuntu SMP Tue Feb 4 21:25:43 UTC 2014 x86_64 x86_64 x86_64
GNU/Linux
However if I use KDE the keyboard controls change the screen brightness. It
seems it's not only a kernel matter.
It's KDE 4.8.5.
--
You
Paolo Montrasio, thank you for your comment. So your hardware and problem may
be tracked, could you please file a new report with Ubuntu by executing the
following in a terminal while booted into a Ubuntu repository kernel (not a
mainline one) via:
ubuntu-bug linux
For more on this, please
The fix in the upstream 3.14-rc2 kernel has been removed and replaced
with a better one in the upstream 3.14-rc4 kernel by these two commits:
commit bd8ba20597f0cfef3ef65c3fd2aa92ab23d4c8e1 - ACPI / video: Filter the _BCL
table for duplicate brightness values
commit
** Tags removed: kernel-fixed-upstream-v3.14.0-031400rc2-generic
** Tags added: kernel-fixed-upstream-3.14-rc2
** Changed in: linux (Ubuntu)
Status: Incomplete = Triaged
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The fix is not perfect: the machine (running kernel
v3.14.0-031400rc2-generic) does not remember the user-set value of the
brightness. After reboot the brightness is set on its maximum.
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The latest mainline kernel 3.14.0-031400rc2-generic fixed the bug. I
can now controll brightness both using the Control Center and also the
Fn F9 and Fn F10 key strokes. I added appropriate tags to the bug.
** Tags added: kernel-fixed-upstream kernel-fixed-
upstream-v3.14.0-031400rc2-generic
It now became possible to boot a live DVD of the latest development
release of ubuntu (64 bit) on my HP ZBook. I installed this system of
the machine's HDD. I have applied all available updates via the
UpdateManager.
The brightenss problem remains.
Afterwards I tested also the latest mainline
ebutler / Barney, thank you for your comment. So your hardware and problem may
be tracked, could you please file a new report with Ubuntu by executing the
following in a terminal while booted into a Ubuntu repository kernel (not a
mainline one) via:
ubuntu-bug linux
For more on this, please
I have the same problem with a ZBook 14 with Intel/AMD graphics. My
current workaround is to use this script (which is actually what I use
on my desktop at night):
#!/bin/bash
xrandr -q | grep connected | awk '{print $1}' | while read d; do
echo setting $d
xrandr --output $d --brightness $1
Oh, sorry, I missed out an important step, my $HOME/backlight directory
is a link to /sys/class/backlight/intel_backlight. You should either do
the same or change $BACKLIGHT_DIR to the same thing, and then the
brightness should get updated instantly when you run the script (no need
for calling any
ebutler, thanks for the workaround, I will try it.
In the meantime I tested at least the live version of the latest development
version of ubuntu
(trusty-desktop-amd64.iso 09-Jan-2014 07:51 910M)
and found the same bug also there.
I am going to update the report according to what I
apport information
** Tags added: apport-collected trusty
** Description changed:
machine: HP ZBook 15
(Intel Core i7 4700MQ Haswell, NVIDIA Quadro K1100M 2GB, 1920 x 1080 display)
I go to the settings/Brightness Lock section.
The button which should controll the screen brightness
** Tags added: latest-bios-1.06
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https://bugs.launchpad.net/bugs/1257766
Title:
can not reduce brightness on HP ZBook
Status in “linux” package in Ubuntu:
Incomplete
apport information
** Tags added: has-workaround reproducible
** Description changed:
machine: HP ZBook 15
(Intel Core i7 4700MQ Haswell, NVIDIA Quadro K1100M 2GB, 1920 x 1080 display)
I go to the settings/Brightness Lock section.
The button which should controll the screen
I am really sorry for my 2nd apport information concerning the package
xserver-xorg-input-evdev
on the latest development version.
It should have been attached to the bug 662933 (keyboard mapping mixed up upon
pressing NumLock).
I did the mistake and attached it to the present bug.
Should I
Hello ebutler,
I tried your script but it did not work for me. Of course I changed the paths
to match my login name konopka.
The script did not modify the brightness even when I run it directly from
command line (using sudo).
However, I was not surprised by it because there is no command for
Yes, it is still an issue on ubuntu 13.10. (No proprietary NVidia driver
installed.) I will test the problem on the latest development version of
ubuntu.
The issue is worse than you might expect. I often need to read and edit
documents and those use a white background (typically PDF documents).
I can confirm this problem still persists also.
Martin -- I hacked this workaround, that maybe can work for you too.
I mapped
'sudo /home/ebutler/bin/backlight.sh up'
to Ctrl-F10 (my backlight is Fn-F10) using the keyboard shortcut options,
and added
ebutler ALL=(ALL) NOPASSWD:
ebutler, thank you for your comment. So your hardware and problem may be
tracked, could you please file a new report by executing the following in a
terminal:
ubuntu-bug xorg
For more on this, please see the official Ubuntu documentation:
Ubuntu X.Org Team, Ubuntu Bug Control, and Ubuntu Bug
Martin Konopka, this bug was reported a while ago and there hasn't been
any activity in it recently. We were wondering if this is still an
issue? If so, could you please test for this with the latest development
release of Ubuntu? ISO images are available from
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