just wondering if anybody knows what's the problem. I use the brightness bar control with my keyboard or in options, the computer shows me the brightness bar increasing or decreasing but the screen is still at max brightness.
My computer is: Gateway NV51M
CPU: Intel Pentium processor T4500
Graphic Card: Intel GM45 Express Chipset
OS: Ubuntu 15.10 64 bit
Brightness bar changes but screen doesn't
Please if anybody can help me, I'm frustrated :(
I do not know if it works for your Computer too. Some has written that it works for this Gateway NV44 (ubuntuforums.org). S*he just used the given script: link to the script
Open terminal and type (or use any other texteditor
mousepad ./backlight_d.sh
Insert to the skript
#!/bin/bash
old_b=9;
declare -i curr_b=240;
declare -i target_b=240;
while : ; do
b=cat /sys/class/backlight/acpi_video0/brightness;
delay="0.5"
if [ $old_b != $b ]; then
old_b=$b
let "target_b=$b * 20 + 12"
#printf "Target: %10d\n" $target_b
fi
hex_b=".";
if [ "$curr_b" -lt "$target_b" ] ; then
let "curr_b=$curr_b + 2"
if [ "$curr_b" -gt "$target_b" ] ; then
let "curr_b=$target_b"
fi
hex_b="-"
elif [ "$curr_b" -gt "$target_b" ] ; then
let "curr_b=$curr_b - 2"
if [ "$curr_b" -lt "$target_b" ] ; then
let "curr_b=$target_b"
fi
hex_b="-"
fi
if [ $hex_b != "." ] ; then
hex_b=printf "%02X" $curr_b
delay="0.005"
setpci -s 00:02.0 F4.B=$hex_b
fi
sleep $delay
done
Save the file and close the editor.
Next is copying the file in /etc and change the file rights by (you may have to enter your password)
sudo cp ./backlight_d.sh /etc/ && sudo chmod +x /etc/backlight_d.sh
Open with a texteditor the rc.local
sudo mousepad /etc/rc.local
and add befor exit 0;
nohup /etc/backlight_d.sh &
Save the file and close the editor.
"restart your computer. According to that article, you should be able to adjust your brightness." source
After searching for days, I came to the solution on the last answer of this page.
I'd like to write the answer here but I don't know HTML. I'm sorry for the people who will find this answer. At least I want to help them writing the url.
