If you are using Ubuntu 14.10 or Ubuntu 14.04, you'll know in a notebook after installation of Ubuntu, each boot, the system's default screen brightness is greatest.
Well, we modify the system to increase the brightness command on Linux to boot script.
1. Check your system maximum brightness: see Figure 1
cd / sys / class / backlight
linuxhost @ linuxhost: ~ $ cd / sys / class / backlight
linuxhost @ linuxhost: / sys / class / backlight $ ll
The total amount of 0
drwxr-xr-x 2 root root 0 1 Yue 312,016 ./
drwxr-xr-x 57 root root 0 1 Yue 312,016 ../
lrwxrwxrwx 1 root root 0 1 Yue 31 15:25 intel_backlight -> ../../devices/pci0000:00/0000:00:02.0/drm/card0/card0-LVDS-1/intel_backlight/
lrwxrwxrwx 1 root root 0 1 Yue 31 15:25 nv_backlight -> ../../devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card1/card1-LVDS-2/nv_backlight/
linuxhost @ linuxhost: / sys / class / backlight $
(Different models of notebook graphics card -> Brightness to adjust the folder name will be different).
2, I was intel_backlight
3, come here, you know for sure: max_brightness system can adjust the maximum brightness value. bightness that you are using the luminance value of the.
Copy the path to the folder.
(Different models of graphics cards, the maximum will be different)
4, well, I know I'm right brightness is 109. At boot time, set about the value of brightness:
cd / etc
sudo vim rc.local
We promise exit 0 5 added to the preceding one command:
echo 50> / sys / class / backlight / intel_backlight / brightness
Figure 2 (screenshots wrong)
Brightness is set to start after 50.