My laptop has keyboard buttons for adjusting screen brightness. After a Debian Squeeze re-installation, they don't work no more.
[laptop] Acer TravelMate 6592; I use Fn< to decrease the brightness and Fn> to increase it.
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Is it a problem of key mapping or a problem of acpi support ?
/proc/acpi/ if you have some entries like this one :
If you find it, try to set a value maybe like this :
echo "4" > /proc/acpi/video/GFX0/LCDD/brightness
Add "acpi_osi=Linux" to loader
title Arch Linux root (hd0,1) kernel /vmlinuz26 root=/dev/sda5 ro acpi_osi=Linux initrd /kernel26.img
It's probably the case that it got removed in the latest Debian Squeeze kernel (which is where the problem was), and it's now put back in 2.6.38. I say that because it was working way before Squeeze was released (and I only use pristine Debian kernel packages).
If you can change your brightness with root user by typing:
echo 100 > /sys/class/backlight/<xxx>/brightnes
Then, you can follow this link: https://askubuntu.com/a/82320/301773