1、解决reboot后无法保存屏幕亮度:

 

 
do gedit /etc/rc.local打开后你会看到如下内容:#!/bin/sh -e## rc.local## This script is eed 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  or disable this script just change the execution# bits.## By default this script does nothing.#exit 0
 

插入这句话到代码中:

 

echo 0 > /sys/class/backlight/ai_veo0/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/brightnessexit 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。

注意:大多数人都是acpi_video0,根据自己/sys/class/backlight/下面文件决定

2、亮度调节

亮度调节依赖与你的bios和内核版本,你可以尝试以下代码:

kernel boot选项:

当你启动系统时,出现在grup的屏幕时,按e键进行编辑,在kernel这一行添加:

     nomodeset acpi_backlight=vendor

注意:有些硬件可能会是不同的选项.

Intel - nomodeset acpi_backlight=intel Acer - acpi_backlight=acer_acpi or even acpi_osi=Linux acpi_backlight=legacy.


我的电脑是acer 4830tg,我直接写的=vendor也是同样可以正常工作,你也可以通过google去查找你要设置的选项。

 

 

    quiet splash nomodeset acpi_backlight=vendor

退出启动,如果能正常启动,就把这项选项添加到默认的选项中,编辑文件/etc/default/grub

 

 

# command linesudo -e /etc/default/grub# graphicalgksu gedit /etc/default/grub

把这一行改成如下:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash nomodeset acpi_backlight=vendor"

保存,更新grup

 

 

sudo up-grub

如果还是没有解决问题的话请参照如下链接方法:

 

http://askubuntu.com/questions/3841/desktop-doesnt-remember-brightness-settings-after-a-reboot

 

http://www.linuxso.com/linuxrumen/16061.html