ubuntu 11.10亮度无法调节和无法保存屏幕亮度解决办法
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/3841/desktop-doesnt-remember-brightness-settings-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： #!/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 0sudo gedit /etc/rc.local打开后你会看到如下内容：#!/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 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“#”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/brightnessexit 0#!/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。
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 -nomodeset acpi_backlight=intel Acer - acpi_backlight=acer_acpi or even acpi_osi=Linux acpi_backlight=legacy.
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。view plaincopy to clipboardprint? quiet splash nomodeset acpi_backlight=vendor
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/grubview plaincopy to clipboardprint?# command line
sudo -e /etc/default/grub
# graphical
gksu gedit /etc/default/grub
# command line
sudo -e /etc/default/grub
# graphical
gksu gedit /etc/default/grub把这一行改成如下：view plaincopy to clipboardprint?GRUB_CMDLINE_LINUX_DEFAULT="quiet splash nomodeset acpi_backlight=vendor"
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash nomodeset acpi_backlight=vendor"保存，更新grup
view plaincopy to clipboardprint?sudo update-grub
sudo update-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
谢谢分享 很感谢，可惜新手还不知道怎么办
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