I installed CrunchBang 11, have been wasting many hours to adjust the brightness through a menu. Frustrated. Why Linux is always so user-non-unfriendly??? I could not even find such a basic functionality.
I am old and stupid from Windows world, please help.
sudo apt-get install xbacklight xbacklight - dec 10
Thanks. It's Lenovo T400, Fn + Home/End does not work, which is fine because I never expect it to work in Linux since Lenovo recommends Windows.
I tried the following two solutions:
Solution 1: (did not work)
1). sudo gedit /etc/default/grub
2). find the line starting with GRUB_CMDLINE_LINUX_DEFAULT
3). add "acpi_osi=Linux acpi_backlight=vendor" to the options
4). sudo update-grub
setpci -s 00:02.0 F4.B=FF
This works, but I have to run this command every time I boot the PC.
FYI, command 'xbacklight - inc 20 ' helped a little bit, but the screen is still not as bright as set by 'setpci -s 00:02.0 F4.B=FF'
In "Xfce Power Manager", the Level is 80% "On AC", but the screen is dim.
If xbacklight works, you can keybind xbacklight + & - # in your ~/.config/openbox/rc.xml and be done with it. The only considerations would be that decreasing too much will completely blank your screen, and you may not be able to use the default fn brightness keys. For your reference, I need a 3.x kernel for my machine to handle multimedia keys correctly- you may need the same. You've posted in Support (Stable), but say you're using Crunchbang 11, so I'm not sure which kernel you've got.
How to store the value somewhere? setpci -s 00:02.0 F4.B=FF'
How hard it is to add a brightness progress bar in "power management", or some other related places, to give users stupid like me a little freedom. ???