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I've got an Asus EEE PC 1005HAB, and after upgrading to 11.04 I can no longer use Fn+F7 to turn on/off the screen backlight. The other Fn+FX keys I've tried so far all work. Is there some standard fix, or should I report this? A quick Google search didn't turn up anything.

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closed as off topic by Marco Ceppi May 21 '12 at 20:57

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Yeah this should probably be a bug report. Instructions here. – Jorge Castro May 2 '11 at 15:14
up vote 2 down vote accepted

I used a Eee PC 1005HA to confirm this. Running dmesg I get:

keyboard: can't emulate rawmode for keycode 244

The keycode refers to XF86KbdLightOnOff, so I think this is a bug.


  • Use xrandr -q to get the monitor's name, should be something like LVDS1.
  • Use compizconfig-settings-manager Install compizconfig-settings-manager commands plugin to set hotkeys to:
    • xrandr --output LVDS1 --off change LVDS1 with your monitors name.
    • xrandr --auto dont use output with this command, it seems to cause window glitches.
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u can have an alternative to turnoff the backlight of lcd whenever u want just type "xset dpms force off" and press enter in terminal or make a desktop launcher of it and attach it in the unity panel , if ur using gnome shell then there's a gnome shell extension to attach desktop launcher to the top panel. hope this will solve ur problem with a single click u can turnoff ur lcd . if possible make a shortcut to "xset dpms force off" or the desktop launcher to this command. hope this may help

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An upgrade from 10.10 to 11.04 removed several packages from me. One of them was smartdimmer. It's package description is:

Nvidia Geforce 6200Go, Geforce 8, Geforce 9, and other cards contain hardware LCD brightness control. Smartdimmer allows this to be controlled through software.

Try installing it, I do not guarantee anything though.

The logs of the upgrade process can be found in /var/log/dist-upgrade, and the log for installed / removed packages in /var/log/dist-upgrade/history.log.

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Does smartdimmer work for cards other than Nvidia? I can't control screen brightness on my laptop with Intel card even though the brightness meter/slider can be moved up and down. – Oxwivi May 2 '11 at 11:43
I don't think so. Could you try manually setting the brightness level using the /sys interface? Run: cd /sys/devices/virtual/backlight/acpi_video0, followed by cat brightness max_brightness. The first number is your current brightness, the second your maximum brightness. The minimum value is 0 (zero). To change it to 3, run: echo 3 | sudo tee brightness. Please report any errors back. – Lekensteyn May 2 '11 at 11:48
Lekensteyn, I think because of my attempts to change brightness (i.e. lower it), the brightness output was 0. I ran the command to change it to three, and after inputting password, output of only 3 was shown. No noticeable change in brightness. – Oxwivi May 2 '11 at 12:22
@Oxwivi: this bug on Launchpad may be of interest for you. – Lekensteyn May 2 '11 at 12:28
That bug I believe is due to the kernel. – Oxwivi May 2 '11 at 13:11

i have made a unity launcher to turnoff the lcd u can also try this

sudo apt-get install --no-install-recommends gnome-panel

gnome-desktop-item-edit ~/Desktop/ --create-new

it will open a small windows

in name type : turnofflcd

in command type : xset dpms force off

i have read abt making launcher from this website:

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