测试环境:Acer Aspire 5750G
NVIDIA GeForce GT630M
Ubuntu 12.04 x86_64其他情况解决方法类似。调节屏幕亮度
Fn不能调节屏幕的亮度。因为fn调节的是/sys/class/backlight/acpi_video0/brightness文件,而I卡的文件是/sys/class/backlight/intel_backlight/brightness。
一、测试代码启动系统,出现grub菜单时,按“e”编辑,在有linux内核路径那一行,添加“acpi_backlight=vendor”,如:linux /boot/vmlinuz-3.2.0-30-generic root=UUID=75c414be-2e17-407a-b699-94f6a398dff7 ro acpi_backlight=vendor quiet splash
如果能正常启动,且用fn能调节屏幕亮度,说明成功,接着下一步。
二、修改grubsudo vi /etc/default/grub
找到:GRUB_CMDLINE_LINUX=""
改为:GRUB_CMDLINE_LINUX="acpi_backlight=vendor“我的grub文件如下:# If you change this file, run "update-grub" afterwards to update# /boot/grub/grub.cfg.# For full documentation of the options in this file, see:# info -f grub -n "Simple configuration"GRUB_DEFAULT=0#GRUB_HIDDEN_TIMEOUT=0GRUB_HIDDEN_TIMEOUT_QUIET=trueGRUB_TIMEOUT=3GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"GRUB_CMDLINE_LINUX="acpi_backlight=vendor"# Uncomment to enable BadRAM filtering, modify to suit your needs# This works with Linux (no patch required) and with any kernel that obtains# the memory map information from GRUB (GNU Mach, kernel of FreeBSD ...)#GRUB_BADRAM="0x01234567,0xfefefefe,0x89abcdef,0xefefefef"# Uncomment to disable graphical terminal (grub-pc only)#GRUB_TERMINAL=console# The resolution used on graphical terminal# note that you can use only modes which your graphic card supports via VBE# you can see them in real GRUB with the command `vbeinfo"#GRUB_GFXMODE=640x480# Uncomment if you don"t want GRUB to pass "root=UUID=xxx" parameter to Linux#GRUB_DISABLE_LINUX_UUID=true# Uncomment to disable generation of recovery mode menu entries#GRUB_DISABLE_RECOVERY="true"# Uncomment to get a beep at grub start#GRUB_INIT_TUNE="480 440 1"更新grub.cfg
? ~ sudo update-grub
查看grub.cfg 发现其中每个启动项都加入了“acpi_backlight=vendor”? ~ vi /boot/grub/grub.cfg设定屏幕初始亮度
重启后发现,屏幕亮度又恢复为最大亮度。查看影响屏幕亮度的文件? ~ vi /sys/class/backlight/intel_backlight/brightness
调节几次屏幕亮度发现其中数值会改变,我的笔记本数值范围为0~976。手动修改该数值,会发现屏幕亮度随之改变(需要root用户执行):? ~ su
Password:
root@ www.linuxidc.com :/home/congbo# echo 500 > /sys/class/backlight/intel_backlight/brightness
因此,将该语句添加到 /etc/rc.local 就能开机自动设定屏幕初始亮度了。修改/etc/rc.local如下(需要root用户执行):#!/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 500 > /sys/class/backlight/intel_backlight/brightnessexit 0调节gamma值
? ~ xgamma -gamma .7
-> Red 1.000, Green 1.000, Blue 1.000
<- Red 0.700, Green 0.700, Blue 0.700SUSE Linux上创建用户方式使用 Bumblebee 控制 NVIDIA 双显卡(Ubuntu)相关资讯 Ubuntu使用教程
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