ubuntu 11.10亮度无法调节和无法保存屏幕亮度解决办法

feiyang10086

ubuntu 11.10亮度无法调节和无法保存屏幕亮度解决办法

经过多次更改失败重装后终于在官网的answers找到了解决办法：原文链接 http://askubuntu.com/questions/3 ... ings-after-a-reboot




1、解决reboot后无法保存屏幕亮度：




view plaincopy to clipboardprint?sudo gedit /etc/rc.local    打开后你会看到如下内容：

1. #!/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.     #exit 0  sudo gedit /etc/rc.local

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打开后你会看到如下内容：

1. #!/bin/sh -e
   
2. #
   
3. # rc.local
   
4. #
   
5. # This script is executed at the end of each multiuser runlevel.
   
6. # Make sure that the script will “exit 0″ on success or any other
   
7. # value on error.
   
8. #
   
9. # In order to enable or disable this script just change the execution
   
10. # bits.
    
11. #
    
12. # By default this script does nothing.
    
13. 
    
14. #exit 0

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插入这句话到代码中：

1. echo 0 > /sys/class/backlight/acpi_video0/brightness

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保证修改后代码如下，注意exit前的“#”

1. view plaincopy to clipboardprint?#!/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  #!/bin/sh -e
   
2. #
   
3. # rc.local
   
4. #
   
5. # This script is executed at the end of each multiuser runlevel.
   
6. # Make sure that the script will “exit 0″ on success or any other
   
7. # value on error.
   
8. #
   
9. # In order to enable or disable this script just change the execution
   
10. # bits.
    
11. #
    
12. # By default this script does nothing.
    
13. echo 0 > /sys/class/backlight/acpi_video0/brightness
    
14. exit 0

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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：

view plaincopy to clipboardprint?     nomodeset acpi_backlight=vendor  
     nomodeset acpi_backlight=vendor注意：有些硬件可能会是不同的选项.view plaincopy to clipboardprint?Intel -

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

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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。

1. view plaincopy to clipboardprint?    quiet splash nomodeset acpi_backlight=vendor  
   
2.     quiet splash nomodeset acpi_backlight=vendor

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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

1. view plaincopy to clipboardprint?# command line   
   
2. sudo -e /etc/default/grub  
   
3.   
   
4. # graphical   
   
5. gksu gedit /etc/default/grub  
   
6. # command line
   
7. sudo -e /etc/default/grub
   
8. 
   
9. # graphical
   
10. gksu gedit /etc/default/grub

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把这一行改成如下：

1. view plaincopy to clipboardprint?GRUB_CMDLINE_LINUX_DEFAULT="quiet splash nomodeset acpi_backlight=vendor"  
   
2. GRUB_CMDLINE_LINUX_DEFAULT="quiet splash nomodeset acpi_backlight=vendor"

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保存，更新grup

1. 
   
2. view plaincopy to clipboardprint?sudo update-grub  
   
3. sudo update-grub

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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/3 ... ings-after-a-reboot

清风鸟儿

谢谢分享

1323657290

很感谢，可惜新手还不知道怎么办