Asus brightness work-around - Ubuntu 10.10

[Shazbot89]

I have had problems with my Asus K60IJ Fn brightness (and applet) control. I have had this issue since 10.4 and sure many others have too. Finally found a work around that worked (many others did not).

This is confirmed for 10.10 on my Asus notebook.

Hope it will help you:

Source: http://wiki.daviddarts.com/Ubuntu_Ma...een_Brightness

Work around:

To activate the screen brightness keys first backup asus-brn-down.sh

sudo cp /etc/acpi/asus-brn-down.sh /etc/acpi/asus-brn-down.sh.backup

Then open asus-brn-down.sh with Gedit.

sudo gedit /etc/acpi/asus-brn-down.sh

Erase everything and paste the following inside.

#!/bin/sh

test -f /usr/share/acpi-support/key-constants || exit 0 
. /usr/share/acpi-support/key-constants
acpi_fakekey $KEY_BRIGHTNESSDOWN

# added per http://forum.notebookreview.com/showpost.php?p=5665108&postcount=1235
#brightness=`echo $3 | sed 's/0000002//'`
#setpci -s 00:02.0 F4.B=${brightness}f

# added per mailing-list post
brightness=$((0x`setpci -s 00:02.0 F4.B`-16));
if [ $brightness -lt 0 ] ; then
   brightness=1;
fi
setpci -s 00:02.0 F4.B=`printf '%x' $brightness`;

Save and close.
Now backup asus-brn-up.sh

sudo cp /etc/acpi/asus-brn-up.sh /etc/acpi/asus-brn-up.sh.backup

Open asus-brn-up.sh with Gedit.

sudo gedit /etc/acpi/asus-brn-up.sh

Erase everything and paste the following inside.

#!/bin/sh
test -f /usr/share/acpi-support/key-constants || exit 0

. /usr/share/acpi-support/key-constants

# DeviceConfig

if [ "$model" != "701" ] ; then
	# On an Eee PC (ASUSTeK model 701) the keys in the range handled by this
	# script have entirely different meanings. They are handled in separate
	# scripts.
	acpi_fakekey $KEY_BRIGHTNESSUP
fi

# added per http://forum.notebookreview.com/showpost.php?p=5665108&postcount=1235
#brightness=`echo $3 | sed 's/0000001//'`
#setpci -s 00:02.0 F4.B=${brightness}f

# added per mailing list post
# in /etc/asus_brn_up.sh
brightness=$((0x`setpci -s 00:02.0 F4.B`+16));
if [ $brightness -gt $((0xff)) ] ; then
  brightness=$((0xff));
fi
setpci -s 00:02.0 F4.B=`printf '%x' $brightness`;

Save and close.
Now you need to modify grub:

sudo gedit /etc/default/grub

Change your "GRUB_CMDLINE_LINUX_DEFAULT=" to the following:

GRUB_CMDLINE_LINUX_DEFAULT="i915.powersave=0 acpi_backlight=vendor vga=792 quiet splash""i915.powersave=0 acpi_backlight=vendor vga=792 quiet splash"

Now update your grub.cfg file:

sudo update-grub

Reboot to activate the screen brightness keys.

[_pitch]

Tnx!
That was exactly the help I was looking for.

[lamanabie]

I am using Ubuntu 11.04. This script works on my ASUS UL30V perfeclty, but i have problems after suspend or hibernation ... Value of backlight is on maximum. How can I do that backlight value will be same before and after suspend/hibernation. Thanks.

[lamanabie]

I am using Ubuntu 11.04. This script works on my ASUS UL30V perfeclty, but i have problems after suspend or hibernation ... Value of backlight is on maximum. How can I do that backlight value will be same before and after suspend/hibernation. Thanks.

SOLVED by
https://bbs.archlinux.org/viewtopic.php?id=119014
https://wiki.archlinux.org/index.php...your_own_hooks

Anyway thanks ^^

[RascalAW]

Awesome Workaround. worked with my Asus UL80..... but the backlight is off at half of the way of the backlight "status bar", can you explain me wich changes i have to do that the backlight is dimmed less per click???

[Toz]

The scripts are incrementing and decrementing the brightness by hexidecimal value 16:

brightness=$((0x`setpci -s 00:02.0 F4.B`-16));

and

brightness=$((0x`setpci -s 00:02.0 F4.B`+16));

You could try increasing/decreasing that value in half. Half of hexidecimal 16 is B. Therefore:

brightness=$((0x`setpci -s 00:02.0 F4.B`-B));

and

brightness=$((0x`setpci -s 00:02.0 F4.B`+B));

[Shazbot89]

Going to have to try Toz's recommendation! Thank you Toz.
Will try and report back on results.