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Unable to adjust screen brightness on Ideapad Z570

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http://askubuntu.com – Brightness adjustment keys have no effect (although they are recognized by the environment), and I can't change the brightness using GUI tools as well. This seems like a problem in Linux itself, not the desktop environment. I can change the brightness in Windows OS, so it's not some kind of hardware fault. Details: Lenovo ideapad Z570 nVIDIA graphics card Kubuntu 11.04 (Linux 2.6.38-10-generic, KDE 4.7.0), everything up to date No proprietary graphics drivers (only Wi-Fi one) What I've tried: Edit /etc/default/grub↦ GRUB_CMDLINE_LINUX_DEFAULT: acpi_osi=Linux, acpi_backlight=v (HowTos)

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Submitted by Songlist on 02/07/2012 – Made popular on 02/07/2012

Stories similar to Unable to adjust screen brightness on Ideapad Z570

I upgraded to Kubuntu 13.04 yesterday and after that the brightness changing function is not working. Before this operation, I was running Kubuntu 12.10 with additional driver for Nvidia GT425M. Brightness changing worked well all the time.

I have a Toshiba l755 laptop, and I installed 12.04 64bit on it. The default brightness of the laptop is set to maximum value, and I can't change it.

If I go to Configuration → Brightness, the brightness doesn't change and neither does pressing the function keys.

I can't change my brighness via the default ubuntu tool or my FN keys, or even xbacklight. I'm running Ubuntu 12.04 on a laptop with a dual graphics (AMD HD6770M+Intel). I've the drivers set up properly and I can switch between them.

I've tried to adjust the brightness on both the integrated and discrete GPU. Nothing happens.

Any clue how do I go ahead fixing this?

I've installed Ubuntu on a Lenovo Y500 laptop (2012), video card is Nvidia 650M (no integrated graphics), I'm using driver 310.19. The problem is that I can't adjust brightness at all.

I have a Sony E series laptop (64 bit) where keys Fn+F5 and Fn+F6 should control the screen brightness. On my machine these keys do control the brightness "slider", but they do not control the actual screen brightness. I am running Ubuntu 12.10.

I forced the acpi_osi=Linux and acpi_backlight=vendor in the grub2 config and I still have the problem BUT now I can use properly the command "echo 8 > /sys/class/backlight/samsung/brightness" to restore the brightness.

I just installed Arch Linux with Gnome and the nvidiabl driver from https://github.com/guillaumezin/nvidiabl , and it seems to work. If I do "echo x > /sys/class/backlight/nvidia_backlight/brightness" the brightness does change. However, if I try to use my shortcut keys (Fn+F5, Fn+F6), the brightness does not change.

I am new to Ubuntu, but so far I am loving it.

I was always unable to change my brightness since I installed Ubuntu, but I figured that installing the latest ATI driver for my graphics card would work.

I did, but I still can't change the brightness.

When I use Fn+F6 / F7 (brighness down and up on Toshiba) the brightness notification opens up and responds, but the actual screen brightness remains unchanged.