"turning off" the backlight

is it possible to "turn off" the backlight of the screen?
finding it very difficult to watch a dvd for example as I get very poor contrast and dark/blacks
adjusting the brightness hasn't solved the problem and I can't find a "contrast" function anywhere?
is this possible to adjust at all?

"Won't it become almost unviewable without a backlight?"
I know what you mean, the question was really whether you can adjust the contrast, it's fine when you're doing any other task / web etc but I only noticed the poor quality when trying to watch a film on "real" dvd. otherwise it's all fine.
BSteely's response pretty much confirms we have to live with it. Maybe this screen should be just a little smaller 12inch would be better probably!

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Ipod nano 6 gen hangs when turning off the backlight. That is, it doesn't respond to button presses on the touch screen.

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Hi Rc_Drifter,
Welcome to the Support Communities! The article below will help you troubleshoot the issue you are having with your iPod nano. Restoring the device may resolve the backlight issue as well.
iPod nano (6th generation): Hardware troubleshooting
http://support.apple.com/kb/ts3474
Display shows a white screen
Try putting the iPod into disk mode:
Reset the device (press the Sleep and Volume Down buttons simultaneously until the display turns black—about eight seconds).
When the display turns black, hold down the Volume Down and Volume Up buttons simultaneously until the device enters Disk mode.
While the device is in disk mode, sync it to iTunes and try to restore.
I hope this information helps ....
- Judy

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The screen is still showing. If you bring the iPod near a bright light, or shine a flashlight on it, you will be able to read the screen with no backlight.
On my 5th gen iPod nano, it is
Settings -> General -> Backlight -> [select setting]

Could hp mini 2140 turn off the backlight of LCD monitor?

how could i do?
I know, lenov s10-2 could do this though Function key.
thanks.

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hi mtbomb,
hi Can you while the Power LED is blinking hold the power down don't let it go until the light disappeared.
Technically the Yoga13 should turn off while holding down the power. at least 10 to 15 sec.
I would suggest calling Technical Support if the above steps did not resolve the issue.
It's possible that when you turn on the system, it is not going to sleep but the blinking indicates failure.
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Lenovo mt-m3167-AJ8 turning off the ACPI

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Sorry, but all I saw was two separate posts saying "Apple dropped the ball on this one" when there really was no ball to be dropped in the first place. If you hold the dimmer key for one second the backlight will turn off from most levels. Apple generally is not in the business of putting a million keys on computers and cluttering up the machine for things that are not necessary.
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Udev rules to turn off keyboard backlight on Asus UX32VD AFTER login

Hi,
I would like to turn off the keyboard backlight everytime my laptop starts.
I looked at :
https://wiki.archlinux.org/index.php/As … _Backlight
So I created a rule :
/etc/udev/rules.d/kbd_backlight.rules
SUBSYSTEM=="leds", ACTION=="add", KERNEL=="asus::kbd_backlight",DRIVERS=="asus-nb-wmi", ATTR{brightness}="0"
It works quite fine, after the boot the keyboard turns OFF.
But at GNOME login it goes ON again.
I found this :
https://wiki.archlinux.org/index.php/Ba … ht_service
and masked
systemctl mask systemd-backlight@leds:asus::kbd_backlight.service
No more success...
On grep later I masked this one :
systemctl mask sys-devices-platform-asus\x2dnb\x2dwmi-leds-asus::kbd_backlight.device
Nothing new.
On more grep and I commented this :
/lib64/udev/rules.d/99-systemd.rules
# SUBSYSTEM=="leds", KERNEL=="*kbd_backlight", TAG+="systemd", IMPORT{builtin}="path_id", ENV{SYSTEMD_WANTS}+="systemd-backlight@leds:$name.service"
I tried to understand a bit more with this, but without success:
https://wiki.archlinux.org/index.php/Ud … f_a_device
udevadm info -a -p /sys/class/leds/asus\:\:kbd_backlight
Udevadm info starts with the device specified by the devpath and then
walks up the chain of parent devices. It prints for every device
found, all possible attributes in the udev rules key format.
A rule to match, can be composed by the attributes of the device
and the attributes from one single parent device.
looking at device '/devices/platform/asus-nb-wmi/leds/asus::kbd_backlight':
KERNEL=="asus::kbd_backlight"
SUBSYSTEM=="leds"
DRIVER==""
ATTR{brightness}=="0"
ATTR{max_brightness}=="3"
ATTR{trigger}=="[none] cpu0 cpu1 cpu2 cpu3 AC0-online rfkill0 phy0rx phy0tx phy0assoc phy0radio BAT0-charging-or-full BAT0-charging BAT0-full BAT0-charging-blink-full-solid rfkill2 rfkill3 "
looking at parent device '/devices/platform/asus-nb-wmi':
KERNELS=="asus-nb-wmi"
SUBSYSTEMS=="platform"
DRIVERS=="asus-nb-wmi"
ATTRS{lid_resume}=="0"
looking at parent device '/devices/platform':
KERNELS=="platform"
SUBSYSTEMS==""
DRIVERS==""
Any idea ?
Thanks!

This is driving me crazy...
At GRUB time the keyboard backlight goes on.
UDEV SCRIPT
/etc/udev/rules.d/kbd_backlight.rules
SUBSYSTEM=="leds", ACTION=="add", KERNEL=="asus::kbd_backlight",DRIVERS=="asus-nb-wmi", ATTR{brightness}="0"
=> turns it off later, more or less when the filesystem is loaded, but when gdm (login/passwd) starts it turns on again.
SYSTEMD SCRIPT
After some fight with systemd I could do a script (the tricky part was to start it at the good "level")
/etc/systemd/system/kbd_backlight_off.service
[Unit]
Description=Turns off the keyboard backlight
Requires=upower.service graphical.target network.target
After=upower.service graphical.target network.target
[Service]
Type=oneshot
RemainAfterExit=no
ExecStart= /usr/bin/dbus-send --type=method_call --system --dest=org.freedesktop.UPower /org/freedesktop/UPower/KbdBacklight org.freedesktop.UPower.KbdBacklight.SetBrightness "int32:0"
[Install]
WantedBy=graphical.target
=> useless, adds nothing to udev (standalone it has the same effect than the udev script)
DESKTOP AUTOSTART SCRIPT
.config/autostart/kbd_backlight_off.desktop
[Desktop Entry]
Type=Application
Exec=dbus-send --type=method_call --print-reply=literal --system --dest='org.freedesktop.UPower' '/org/freedesktop/UPower/KbdBacklight' 'org.freedesktop.UPower.KbdBacklight.SetBrightness' "int32:0"
Hidden=false
X-GNOME-Autostart-enabled=true
Name[en_US]=kbd_backlight_off
Name=kbd_backlight_off
Comment[en_US]=kbd_backlight_off
Comment=kbd_backlight_off
=> it turns if off after the login, but when the background wallpaper is displayed it goes on again...
Shouldn't be so difficult to turn the keyboard backlight off, from the boot time... What am I missing ???

"turning off" the backlight

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