Lenovo Ideapad Z400 Brightness Problem

[afagund]

Bought a Lenovo Ideapad Z400 and installed a Centos 7 on it, however, I am now able to adjust screen brightness. The screen is very dark. When I press F11 and F12 to decrease / increase brightness, nothing happens. Please can someone help here?

Thanks!
Andre

[afagund]

VGA compatibility on Linux is really a nightmare. On my desktop was easier to replace the GPU than find a solution for the problem. I fell that in this case, I will have to return this laptop and try another one with a different VGA card.

[afagund]

Just figured it by myself. If you try to adjust the brightness while on CentOS, it will not work, however, if you try that out of CentOS, like while the laptop is booting or in the BIOS, it will work.

[kt53]

This: xbacklight-1.2.1-1.el7.nux.x86_64.rpm, might help.

https://centos.pkgs.org/7/nux-dextop-x8 ... 4.rpm.html

Description

xbacklight - Adjust backlight brightness using RandR
Distribution: CentOS 7
Repository: Nux Dextop x86_64
Package name: xbacklight
Package version: 1.2.1
Package release: 1.el7.nux
Package architecture: x86_64
Package type: rpm
Installed size: 27.82 KB
Download size: 17.24 KB
Official Mirror: li.nux.ro

Xbacklight is used to adjust the backlight brightness where supported. It finds all outputs on the X server supporting backlight brightness control and changes them all in the same way.