双显卡笔记本禁用独显

1. Download the  LiveUSB Creator program for Windows from  http://fedorahosted.org/liveusb-creator.
2. LiveUSB Creator can create live USB media either from an image file that you downloaded previously, as described in  Section 2.1.3, “Which Files Do I Download?”, or it can download an image file from the Internet. Either:
   • click the  Browse button under the  Use existing LiveCD label, browse to the location where you previously downloaded a Fedora Live ISO file, and select that file.
   • select a Fedora Live ISO file from the drop-down menu that  LiveUSB Creator presents under the Download Fedora label. Note that image files are large and that it is probably impractical to use  LiveUSB Creator to download an image file if you do not have a broadband connection to the Internet.

3. Click Create Live USB

   先弄个livecd测试下再安装

   测试环境:fedora18 3.8.4-202.fc18.i686.PAE
   显卡环境:HD3000+NV540M
   
   首先声明,以下方法只能保证你能禁用独立显卡,可能不能让你像装好Bumblebee后那样能切换到独立显卡!
   
   1.
   $ lspci | grep VGA 
   查看当前的显卡是哪些(在bios中关闭了独显的记得切过来)
   
   2.
   $ su
   切换到root
   
   3.
   # cat /sys/kernel/debug/vgaswitcheroo/switch
   输出应该类似于

   
   
   0:IGD:+:Pwr:0000:00:02.0
   1:DIS: :Pwr:0000:01:00.0
   如果没有类似输出,恭喜你,只能选用别的方法了
   
   4.
   上面的0代表的是我的HD3000,1代表独立显卡
   注意:两条都是 Pwr
   说明两个显卡都在工作,你的风扇当然就....
   
   5.
   # echo DDIS>/sys/kernel/debug/vgaswitcheroo/switch
   用来切换到独立显卡
   # echo DIGD>/sys/kernel/debug/vgaswitcheroo/switch
   用来切换到集成显卡
   #echo OFF>/sys/kernel/debug/vgaswitcheroo/switch
   用来关闭不用的显卡
   
   6.
   # echo DIGD>/sys/kernel/debug/vgaswitcheroo/switch
   # echo OFF>/sys/kernel/debug/vgaswitcheroo/switch
   
   7.
   
   好了,看效果的时候到了
   
   # cat /sys/kernel/debug/vgaswitcheroo/switch
   
   0:IGD:+:Pwr:0000:00:02.0
   1:DIS: :Off:0000:01:00.0
   看见没有!下面的Pwr变成了Off哦
   
   #lspci | grep VGA
   
   00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09)
   01:00.0 VGA compatible controller: NVIDIA Corporation GF108 [GeForce GT 540M] (rev ff)
   
   (rev ff)
   看下面的ff,也是说明VGA图形设备已关闭哦
   

   
   

   cat /sys/kernel/debug/vgaswitcheroo/switch

   如果类似这样（主要是两个状态都是Pwr）：

   1 2	0:IGD:+:Pwr:0000:00:02.0 1:DIS: :Pwr:0000:01:00.0

   就说明你的两块显卡都开着，那么就按照下面的步骤做吧
   建立一个脚本/usr/local/sbin/vgaswitcher

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   #!/bin/bash   if["$(whoami)"!="root"];then    echo"Use as root"    exit1 fi   if[ -z"$1"];then         cmd="OFF" else    if["$1"="-i"];then       cmd="DIGD"    elif["$1"="-d"];then       cmd="DDIS"    else            cmd=$1    fi fi   if(["$cmd"!="OFF"] && ["$cmd"!="DDIS"] && ["$cmd"!="DIGD"]);then         echo"Bad Command!"         exit1 fi   echo"$cmd">/sys/kernel/debug/vgaswitcheroo/switch cat/sys/kernel/debug/vgaswitcheroo/switch

   然后再建立一个启动脚本/etc/init.d/vgaswitch

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   #!/bin/bash   if["$1"!="start"];then    exit; fi   /usr/local/sbin/vgaswitcher /usr/local/sbin/vgaswitcher-i

   都建立好以后，执行如下命令：

   1	sudochmod+x/usr/local/sbin/vgaswitcher/etc/init.d/vgaswitch&&sudoupdate-rc.d vgaswitch defaults

   重启就可以禁用掉独显了~
   可以再次执行最开始的命令来查看状态：

   1	cat/sys/kernel/debug/vgaswitcheroo/switch

   现在应该是这样了（一个Pwr，另一个Off）：

   1 2	0:IGD:+:Pwr:0000:00:02.0 1:DIS: :Off:0000:01:00.0

   
   

   http://fedoraproject.org/wiki/Bumblebee