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dallaslu N卡驱动亮度可以解决的：
代码:
sudo gedit /etc/X11/xorg.conf
加上下面的即可：
代码:
Section "Device"
Identifier "Default Device"
Option "RegistryDwords" "EnableBrightnessControl=1"
EndSection
关于保存亮度：
sudo gedit /etc/rc.local
插入这句话到代码中：
echo 0 > /sys/class/backlight/acpi_video0/brightness保证修改后代码如下，注意exit前的“#”
#!/bin/sh -e
#
# rc.local
#
# This script is executed at the end of each multiuser runlevel.
# Make sure that the script will “exit 0″ on success or any other
# value on error.
#
# In order to enable or disable this script just change the execution
# bits.
#
# By default this script does nothing.
echo 0 > /sys/class/backlight/acpi_video0/brightness
exit 0
其中echo 后面的值为0-10，对应为0到100%,如echo 5表示一半亮度
保存后退出，重启就可以了。