Controlling Brightness in 9.10

[quaid123]

Hello!

I want to pick up an obviously unsolved problem. I have a Samsung Q210 Seven Notebook and recently installed Kubuntu. Everything works fine, as long as I put on my sunglasses when working with the notebook in the evening.
Triggering the hotkeys shows an icon with a percentage counter that increases or decreases, depending on which function key I use. Although this looks really nifty, it gets boring after utilizing a few times. And, as you might already think, the brightness doesn't change here...

I found a hint telling to adjust the /etc/default/grub:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash nomodeset acpi_backlight=vendor"

The only effect this has is that the nice percentage lowering/raising minigame doesn't work anymore

Also, nothing from the suggestions from the previous post work. This is really bad, since that way not only the user's eyes suffer, but also the energy consumption of the display is maximized.


So, if anybody knows how I can change brightness/backlight intensity please tell me!

Best regards,
Christian

[johngreth]

Have you looked for a brightness setting in the BIOS? It may be blocking the OS from changing it.

[quaid123]

Thanks for the answer, but sadly that doesn't help. In my BIOS, I can choose whether to auto- or user-select the brightness. During the boot session I can even use the Function Keys to change the brightness!

But not anymore in KDE. It seems like Kubuntu "locks" these keys...

[johngreth]

Are the keys properly set in "Keyboard Shortcuts" (or the kde equivalent)? By the fact that you are getting a percent bar I'd say it probably is, but it can't hurt to check. It might also be your graphics driver.

[quaid123]

Hmm, I didn't get to find these shortcut settings. But it's not only the keys, when using the brightness slider in the battery menu, nothing goes either...

So you could say brightness control is disabled by Ubuntu. As I said, during bootup everything goes. So Ubuntu does something such that it doesn't work anymore...

Maybe I just switch to Fedora now, has to be a nice dis, as I hear!


Anyway, best regards,
Christian