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I have a Asus X551MA, here is what worked for me. Update Grub; Open terminal with Ctrl+Alt+T type in terminal; gksudo gedit /etc/default/grub Change; GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" to GRUB_CMDLINE_LINUX_DEFAULT="quiet splash pcie_aspm=force acpi_osi=" Save and Exit gedit type in terminal; sudo update-grub Restart your computer; ...


What worked for me was going to control panel, then power options. Then you see plans shown on battery meter and show/hide additional plans. for all the plans change the settings to whichever brightness you always want it to be. Please reply if you have any questions.


I was having the same problem for lenovo z500 IDEAPAD. I used following steps sudo -i cd /sys/class/backlight/ ls gives output: ideapad intel_backlight After these I tried to change brightness value by these commands for both the ideapad and intel_backlight: sudo echo 3 > ideapad/brightness and sudo echo 3 > intel_backlight/brightness


The file /sys/class/backlight/intel_backlight/brightness contains the brightness information. So you can just set the desired brightness by a command like this: echo 500 >/sys/class/backlight/intel_backlight/brightness (the range of brightness is generally up to 950).

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