Brightness keys are not working

And we're supposed to magically know what laptop you have?
 
You can try acpi_video(4) but I have no idea if it's going to work. It's still unclear what kind of hardware this laptop contains.
 
Do a...

Code: 
# sysctl -a | grep "bright"

Do you have anything to do with brightness here?

If so, see if you can change it and if you can, perhaps use xbindkeys or something to create your own brightness switcher in X11.
 
ramakrishna said:
How to decrease & increase Brightness using Function keys?
Click to expand...
If I understand it right then You need a fully working ACPI (without any errors) for your mobile system (If not - you can dump it from memory, decompile it and then fix it by hand - but it's a lot of headache).
Or, if you're able to change backlight level in Xorg (using xbacklight for example), you can also try to get scancodes for brightness keys (using xev for example) and then map these codes to call a commandline for actually changing brightness (in your favorite WM or some standalone key-mapping program).
And show your dmesg, please.
 
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