Comments on: Adjust LCD brightness from command line http://www.linuxscrew.com/2007/10/25/ajust-lcd-brightness-from-command-line-works-at-dell-1501/ Put the screw on Linux! Tue, 14 Oct 2008 07:52:58 +0000 http://wordpress.org/?v=2.2.2 By: Petko http://www.linuxscrew.com/2007/10/25/ajust-lcd-brightness-from-command-line-works-at-dell-1501/#comment-20893 Petko Sat, 31 May 2008 09:11:44 +0000 http://www.linuxscrew.com/2007/10/25/ajust-lcd-brightness-from-command-line-works-at-dell-1501/#comment-20893 Hello. Here is another way to do this. I add in the file ~/.bashrc : Bup () { FILE=/proc/acpi/video/VID/LCD/brightness current=`cat $FILE | grep current | cut -c 10-` prev=12 for i in `cat $FILE | grep levels | cut -c 17-`; do if [[ $i -eq $current && "$1" == "-" ]]; then echo -n $prev > $FILE break; elif [ $i -gt $current ]; then echo -n $i > $FILE ; break; fi; prev=$i done } Bdown (){ Bup -; } (Just make sure the line FILE=/proc/acpi/video/... points to your correct file.) This way, I can type in a terminal "Bup" or "Bdown" to set the brightness up or down. Greetings. Hello. Here is another way to do this. I add in the file ~/.bashrc :

Bup ()
{
FILE=/proc/acpi/video/VID/LCD/brightness
current=`cat $FILE | grep current | cut -c 10-`
prev=12
for i in `cat $FILE | grep levels | cut -c 17-`; do
if [[ $i -eq $current && "$1" == "-" ]]; then
echo -n $prev > $FILE
break;
elif [ $i -gt $current ]; then
echo -n $i > $FILE ;
break;
fi;
prev=$i
done
}
Bdown (){ Bup -; }

(Just make sure the line FILE=/proc/acpi/video/… points to your correct file.)
This way, I can type in a terminal "Bup" or "Bdown" to set the brightness up or down.

Greetings.

]]> By: Alex http://www.linuxscrew.com/2007/10/25/ajust-lcd-brightness-from-command-line-works-at-dell-1501/#comment-3907 Alex Tue, 04 Mar 2008 04:14:29 +0000 http://www.linuxscrew.com/2007/10/25/ajust-lcd-brightness-from-command-line-works-at-dell-1501/#comment-3907 The following is working nicely for me: #!/bin/sh # adjust lcd brightness on Dell Inspiron 1501 - 080303 Alex P Janssen Jr - alex@ourwoods.org # INSTRUCTIONS: # Save this script to a file named brightup.sh in /home/yourusername/bin # Make it executable: chmod +x brightup.sh # Save yourself having to run it in a terminal and enter your password each time # edit sudoers: sudo visudo # add to sudoers: yourusername ALL=(ALL) NOPASSWD:/bin/bash # save and exit # link brightup and brightdn to brightup.sh: # ln -s /home/yourusername/bin/brightup.sh /home/yourusername/bin/brightup # ln -s /home/yourusername/bin/brightup.sh /home/yourusername/bin/brightdn # Add a couple of custum launchers to your panel ( I run Gnome ) # Right-click the panel and select Add to Panel # Click Custom Launcher # Type=Application, Name=Darker, Command=sudo bash -c /home/apjjr/bin/brightdn # Select a down-arrow for an icon and Close # Do the same for brightup, except set the name to Lighter and pick an up-arrow # # check our id #echo `id` ourname=$0 ourname=`basename "$ourname"` xx=`cat /proc/acpi/video/VGA/LCD/brightness | grep current | cut -c 9-` curbright=`echo $xx` # check process name and current brightness setting #echo "${ourname},${curbright}:" case $curbright in 0) # after boot my brightness value is 0 # echo "12" echo -n 12 >/proc/acpi/video/VGA/LCD/brightness ;; 12) if [ "$ourname" = "brightup" ]; then #echo "12 to 25" echo -n 25 >/proc/acpi/video/VGA/LCD/brightness fi ;; 25) if [ "$ourname" = "brightup" ]; then #echo "25 to 37" echo -n 37 >/proc/acpi/video/VGA/LCD/brightness else echo -n 12 >/proc/acpi/video/VGA/LCD/brightness fi ;; 37) if [ "$ourname" = "brightup" ]; then #echo "37 to 50" echo -n 50 >/proc/acpi/video/VGA/LCD/brightness else echo -n 25 >/proc/acpi/video/VGA/LCD/brightness fi ;; 50) if [ "$ourname" = "brightup" ]; then #echo "50 to 62" echo -n 62 >/proc/acpi/video/VGA/LCD/brightness else echo -n 37 >/proc/acpi/video/VGA/LCD/brightness fi ;; 62) if [ "$ourname" = "brightup" ]; then #echo "62 to 75" echo -n 75 >/proc/acpi/video/VGA/LCD/brightness else echo -n 50 >/proc/acpi/video/VGA/LCD/brightness fi ;; 75) if [ "$ourname" = "brightup" ]; then #echo "75 to 87" echo -n 87 >/proc/acpi/video/VGA/LCD/brightness else echo -n 62 >/proc/acpi/video/VGA/LCD/brightness fi ;; 87) if [ "$ourname" = "brightup" ]; then #echo "87 to 100" echo -n 100 >/proc/acpi/video/VGA/LCD/brightness else echo -n 75 >/proc/acpi/video/VGA/LCD/brightness fi ;; 100) if [ "$ourname" != "brightup" ]; then echo -n 87 >/proc/acpi/video/VGA/LCD/brightness fi ;; esac exit 0 That's it. Alex The following is working nicely for me:
#!/bin/sh
# adjust lcd brightness on Dell Inspiron 1501 - 080303 Alex P Janssen Jr - alex@ourwoods.org
# INSTRUCTIONS:
# Save this script to a file named brightup.sh in /home/yourusername/bin
# Make it executable: chmod +x brightup.sh
# Save yourself having to run it in a terminal and enter your password each time
# edit sudoers: sudo visudo
# add to sudoers: yourusername ALL=(ALL) NOPASSWD:/bin/bash
# save and exit
# link brightup and brightdn to brightup.sh:
# ln -s /home/yourusername/bin/brightup.sh /home/yourusername/bin/brightup
# ln -s /home/yourusername/bin/brightup.sh /home/yourusername/bin/brightdn
# Add a couple of custum launchers to your panel ( I run Gnome )
# Right-click the panel and select Add to Panel
# Click Custom Launcher
# Type=Application, Name=Darker, Command=sudo bash -c /home/apjjr/bin/brightdn
# Select a down-arrow for an icon and Close
# Do the same for brightup, except set the name to Lighter and pick an up-arrow
#
# check our id
#echo `id`
ourname=$0
ourname=`basename "$ourname"`
xx=`cat /proc/acpi/video/VGA/LCD/brightness | grep current | cut -c 9-`
curbright=`echo $xx`
# check process name and current brightness setting
#echo "${ourname},${curbright}:"
case $curbright in
0) # after boot my brightness value is 0
# echo "12"
echo -n 12 >/proc/acpi/video/VGA/LCD/brightness
;;
12) if [ "$ourname" = "brightup" ]; then
#echo "12 to 25"
echo -n 25 >/proc/acpi/video/VGA/LCD/brightness
fi
;;
25) if [ "$ourname" = "brightup" ]; then
#echo "25 to 37"
echo -n 37 >/proc/acpi/video/VGA/LCD/brightness
else
echo -n 12 >/proc/acpi/video/VGA/LCD/brightness
fi
;;
37) if [ "$ourname" = "brightup" ]; then
#echo "37 to 50"
echo -n 50 >/proc/acpi/video/VGA/LCD/brightness
else
echo -n 25 >/proc/acpi/video/VGA/LCD/brightness
fi
;;
50) if [ "$ourname" = "brightup" ]; then
#echo "50 to 62"
echo -n 62 >/proc/acpi/video/VGA/LCD/brightness
else
echo -n 37 >/proc/acpi/video/VGA/LCD/brightness
fi
;;
62) if [ "$ourname" = "brightup" ]; then
#echo "62 to 75"
echo -n 75 >/proc/acpi/video/VGA/LCD/brightness
else
echo -n 50 >/proc/acpi/video/VGA/LCD/brightness
fi
;;
75) if [ "$ourname" = "brightup" ]; then
#echo "75 to 87"
echo -n 87 >/proc/acpi/video/VGA/LCD/brightness
else
echo -n 62 >/proc/acpi/video/VGA/LCD/brightness
fi
;;
87) if [ "$ourname" = "brightup" ]; then
#echo "87 to 100"
echo -n 100 >/proc/acpi/video/VGA/LCD/brightness
else
echo -n 75 >/proc/acpi/video/VGA/LCD/brightness
fi
;;
100) if [ "$ourname" != "brightup" ]; then
echo -n 87 >/proc/acpi/video/VGA/LCD/brightness
fi
;;
esac
exit 0

That’s it.
Alex

]]> By: Alex http://www.linuxscrew.com/2007/10/25/ajust-lcd-brightness-from-command-line-works-at-dell-1501/#comment-3898 Alex Mon, 03 Mar 2008 04:04:02 +0000 http://www.linuxscrew.com/2007/10/25/ajust-lcd-brightness-from-command-line-works-at-dell-1501/#comment-3898 Thanks for posting this info. Every day, I learn something new about using linux. Much more fun than M$ Win! Seems to me this could easily be put in a script that would read the current setting and go up or down depending on which name it was called with. I'm going to work on it for myself and post it back here in case anyone else is interested. Can all of the hardware be controlled via the /proc dir? Thanks again for the pointer. :-) Thanks for posting this info. Every day, I learn something new about using linux. Much more fun than M$ Win!
Seems to me this could easily be put in a script that would read the current setting and go up or down depending on which name it was called with.
I'm going to work on it for myself and post it back here in case anyone else is interested.
Can all of the hardware be controlled via the /proc dir?

Thanks again for the pointer. :-)

]]> By: animatt http://www.linuxscrew.com/2007/10/25/ajust-lcd-brightness-from-command-line-works-at-dell-1501/#comment-3774 animatt Sat, 23 Feb 2008 17:57:14 +0000 http://www.linuxscrew.com/2007/10/25/ajust-lcd-brightness-from-command-line-works-at-dell-1501/#comment-3774 Try running cat /proc/acpi/video/VGA/LCD/brightness This will show supported brightness levels. Running it on my monitor gives root@Gateway-M-Series:/home/animatt# cat /proc/acpi/video/VGA/LCD/brightnesslevels: 100 37 12 25 37 50 62 75 87 100 current: 12 Try running cat /proc/acpi/video/VGA/LCD/brightness

This will show supported brightness levels.

Running it on my monitor gives

root@Gateway-M-Series:/home/animatt# cat /proc/acpi/video/VGA/LCD/brightnesslevels: 100 37 12 25 37 50 62 75 87 100
current: 12

]]> By: ross http://www.linuxscrew.com/2007/10/25/ajust-lcd-brightness-from-command-line-works-at-dell-1501/#comment-3677 ross Mon, 18 Feb 2008 18:02:33 +0000 http://www.linuxscrew.com/2007/10/25/ajust-lcd-brightness-from-command-line-works-at-dell-1501/#comment-3677 it might only work on opensuse. when you do this kpowersave doesnt work it might only work on opensuse. when you do this kpowersave doesnt work

]]> By: ross http://www.linuxscrew.com/2007/10/25/ajust-lcd-brightness-from-command-line-works-at-dell-1501/#comment-3676 ross Mon, 18 Feb 2008 18:01:21 +0000 http://www.linuxscrew.com/2007/10/25/ajust-lcd-brightness-from-command-line-works-at-dell-1501/#comment-3676 turn off acpi and it will work with fn keys turn off acpi and it will work with fn keys

]]> By: Satish Vellanki http://www.linuxscrew.com/2007/10/25/ajust-lcd-brightness-from-command-line-works-at-dell-1501/#comment-3419 Satish Vellanki Wed, 06 Feb 2008 06:55:11 +0000 http://www.linuxscrew.com/2007/10/25/ajust-lcd-brightness-from-command-line-works-at-dell-1501/#comment-3419 No luck for me :-( # echo -n 50 > /proc/acpi/video/VGA/LCD/brightness bash: echo: write error: Invalid argument What could be wrong? No luck for me :-(

# echo -n 50 > /proc/acpi/video/VGA/LCD/brightness
bash: echo: write error: Invalid argument

What could be wrong?

]]> By: artiomix http://www.linuxscrew.com/2007/10/25/ajust-lcd-brightness-from-command-line-works-at-dell-1501/#comment-3170 artiomix Thu, 24 Jan 2008 20:28:02 +0000 http://www.linuxscrew.com/2007/10/25/ajust-lcd-brightness-from-command-line-works-at-dell-1501/#comment-3170 Hello Rasha, try this: <code>sudo -s</code> or <code>su</code> then <code>echo -n 100 > /proc/acpi/video/VID/LCD/brightness</code> :D Hello Rasha,

try this:

sudo -s or su

then

echo -n 100 > /proc/acpi/video/VID/LCD/brightness

:D

]]> By: Rasha http://www.linuxscrew.com/2007/10/25/ajust-lcd-brightness-from-command-line-works-at-dell-1501/#comment-3168 Rasha Thu, 24 Jan 2008 15:56:59 +0000 http://www.linuxscrew.com/2007/10/25/ajust-lcd-brightness-from-command-line-works-at-dell-1501/#comment-3168 I have a Dell Latitude C610 and I've tried running the line in Ubuntu tho I had to modify as my line is /proc/acpi/video/VID/LCD/brightness. But it's saying the command is unknown. I have a Dell Latitude C610 and I've tried running the line in Ubuntu tho I had to modify as my line is /proc/acpi/video/VID/LCD/brightness. But it’s saying the command is unknown.

]]> By: artiomix http://www.linuxscrew.com/2007/10/25/ajust-lcd-brightness-from-command-line-works-at-dell-1501/#comment-2632 artiomix Thu, 10 Jan 2008 21:50:04 +0000 http://www.linuxscrew.com/2007/10/25/ajust-lcd-brightness-from-command-line-works-at-dell-1501/#comment-2632 Hey everybody, thanks for your comments! :) Hey everybody, thanks for your comments! :)

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