Ubuntu – How to disable KDE’s brightness OSD

brightnesskdekubuntumacbook pro

I am using lightum to automatically control the screen's brightness depending on the surrounding light (on a Retina MacBook Pro).

The problem is, though, that KDE picks up the change and displays the OSD (same one that shows up when you change brightness with keyboard).

The brightness changes slightly every minute or so, making the OSD incredibly annoying. I would gladly get rid of it entirely if I could.

Some research

I looked in KDE's notifications settings, found nothing. I also grep'd ~/.kde/share/config, found nothing. Google didn't help either.

Apparently setting the brightness by doing

# echo 4 > /sys/devices/pci0000\:00/0000\:00\:02.0/backlight/acpi_video0/brightness

doesn't bring up the OSD. From the source code, lightum seems to be setting brightness via dbus (org.kde.Solid.PowerManagement.setBrightness).

Best Answer

You can do that by going into the Global Shortcuts control panel in System Settings and, under the "kded" section, remove the key binding for brightness up and brightness down.

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Ubuntu – Screen brightness control not working on Lenovo T530

I had a similar problem on my thinkpad W530. I finally found a solution here:

http://blog.pearce.org.nz/2012/08/enabling-external-monitor-on-lenovo.html

These days X automatically configures itself, so you can't just edit the xorg.conf file, you instead need to add a section to a file in /usr/share/X11/xorg.conf.d/ and X will include that section in the configuration that it automatically generates.

So to get the screen brightness keys working with your Nvidia graphics card, create a file in the xorg.conf.d directory, e.g:

sudo gedit /usr/share/X11/xorg.conf.d/10-nvidia-brightness.conf

Paste the following into the file:

Section "Device"
    Identifier     "Device0"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    BoardName      "Quadro K1000M"
    Option         "RegistryDwords" "EnableBrightnessControl=1"
EndSection

Ubuntu – Lenovo Y500 can’t set brightness

I installed Xubuntu 12.10 on my new Lenovo Y500 and also could not adjust brightness, it was at at maximum and could not be controlled. Get installed and used graphics driver:

lshw -c video

Gave me:

configuration: drigver=nouveau latency=0

changing the value in /sys/class/backlight/acpi_video0/brightness does not change brightness
booting with acpi_backlight=vendor does not change brightness
etpci -s 00:01.0 F4.B=XX (XX = 00 to ff) does not change brightness

For the moment I solved this by installing the nvidia driver:

sudo apt-get install linux-source
sudo apt-get install linux-headers-generic
sudo apt-get install nvidia-current-updates

This gives you the terminal command:

sudo nvidia-settings

Go to: DFP-0-(LGD), Tab: Color Correction

Here you can set the brightness.

Some research

Best Answer

Related Solutions

Ubuntu – Screen brightness control not working on Lenovo T530

Ubuntu – Lenovo Y500 can’t set brightness

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