This works on my Samsung NP-Q45 using a 00:02.0 VGA compatible controller: Intel Corporation Mobile GM965/GL960 Integrated Graphics Controller (primary) (rev 03) Tried acpi_backlight=vendor as kernel parameter also, with no suceess.So, after reading a post from hesapotman I wrote 2 scripts, 2 sudoerrs lines and 2 keyboard hotkey mappings to make it just work. So let's see the two short similar scripts: /etc/adminscripts/brightness/brup #!/bin/bash # Pulls backlight brightness UP one step typeset -i new=16#ff Current=`sudo setpci -s 00:02.0 F4.B` echo brightness now $Current new=16#$Current+16 # roof it to 0xff if (( $new > 0xff )) ; then new=16#ff fi printf "sudo setpci -s 00:02.0 F4.B=%x\n" $new |sh /etc/adminscripts/brightness/brdn #!/bin/bash # Pulls backlight brightness DOWN one step typeset -i new=16#ff Current=`sudo setpci -s 00:02.0 F4.B` echo brightness now $Current new=16#$Current-16 # floor it to 0x1f if (( $new < 0x1f )) ; then new=16#1f fi printf "sudo setpci -s 00:02.0 F4.B=%x\n" $new |sh Hexadecimal values in bash may be represented as base#value where base is 16 or as 0xHH where HH is the value. Those scripts first reads function B from slot F4 of pci device 00:02.0, adds or subtracts 16 bits and rewrite the values in the same place. Adjust increments and floor/ceiling limits to your needs. You may test each script separately running them directly from the commandline (remember to chmod 700 them).Now we need to associate each script to a key sequence. It seems perhaps that this commands needs to be run as root from within gnome. So first add these two linws to sudoers file using visudo. # Cmnd alias specification Cmnd_Alias BRIGHT_CMDS = /etc/adminscripts/brightness/brup, /etc/adminscripts/brightness/brdn # User privilege specification ALL ALL=(ALL) NOPASSWD: BRIGHT_CMDS Then using "Keyboard Shortcuts" application inside gnome, assign the shortcuts: Click add, as Name put something like Brightness UP/DOWN and as Command put sudo or gksudo /etc/adminscripts/brightness/brup and brdn respectively.Click on shortcut field and associate your preferred key combination. |
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