ubuntu 12.04亮度無法調節和無法保存屏幕亮度解決辦法

經過多次更改失敗重裝後終於在官網的answers找到了解決辦法:原文鏈接 http://askubuntu.com/questions/3841/desktop-doesnt-remember-brightness-settings-after-a-reboot


1、解決reboot後無法保存屏幕亮度:


sudo gedit /etc/rc.local

打開後你會看到如下內容:

#!/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



插入這句話到代碼中:

echo 0 > /sys/class/backlight/acpi_video0/brightness
保證修改後代碼如下,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 後面的值爲0-10,對應爲0到100%,如echo 5表示一半亮度

保存後退出,重啓就可以了。

注意:大多數人都是acpi_video0,根據自己/sys/class/backlight/下面文件決定

2、亮度調節

亮度調節依賴與你的bios和內核版本,你可以嘗試以下代碼:

kernel boot選項:

當你啓動系統時,出現在grup的屏幕時,按e鍵進行編輯,在kernel這一行添加:

     nomodeset acpi_backlight=vendor
注意:有些硬件可能會是不同的選項.
Intel - nomodeset acpi_backlight=intel Acer - acpi_backlight=acer_acpi or even acpi_osi=Linux acpi_backlight=legacy.

我的電腦是acer 4830tg,我直接寫的=vendor也是同樣可以正常工作,你也可以通過google去查找你要設置的選項。

    quiet splash nomodeset acpi_backlight=vendor
退出啓動,如果能正常啓動,就把這項選項添加到默認的選項中,編輯文件/etc/default/grub

# command line
sudo -e /etc/default/grub

# graphical
gksu gedit /etc/default/grub
把這一行改成如下:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash nomodeset acpi_backlight=vendor"
保存,更新grup

sudo update-grub
如果還是沒有解決問題的話請參照如下鏈接方法:

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

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