其实写出本文没有多少技术含量， 只是让新手少走弯路。大牛勿喷！
安装Debian 8后第一件事就是安装显卡驱动
sudo dpkg --add-architecture i386
sudo aptitude update
sudo aptitude install make gcc
sudo aptitude install build-essential
sudo aptitude install linux-headers-$(uname -r)
sudo aptitude install fglrx-driver fglrx-atieventsd fglrx-control fglrx-modules-dkms glx-alternative-fglrx amd-opencl-icd
sudo aticonfig --initial
事实证明，开源驱动安装后是进不了图形界面的～(不要打我。。。)
接着来， 先看下你的AMD/ATI显卡型号 (这是我显卡驱动安装成功后的)
可以看到[Radeon HD 6630M/6650M/6750M/7670M/7690M]
$ 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: Advanced Micro Devices, Inc. [AMD/ATI] Whistler [Radeon HD 6630M/6650M/6750M/7670M/7690M]
然后进入AMD官网根据显卡型号下载驱动
/zh-cn/download/
下载后amd-catalyst-15.9-linux-installer-15.201.1151-x86.x86_64.zip文件，
解压后是AMD-Catalyst-15.9-Linux-installer-15.201.1151-x86.x86_64.run，
直接
sudo chmod 777 AMD-Catalyst-15.9-Linux-installer-15.201.1151-x86.x86_64.run
sudo ./AMD-Catalyst-15.9-Linux-installer-15.201.1151-x86.x86_64.run
然后会出现图形界面，一步一步安装即可，安装完成后会提示重启
首先可以看到
图形那里已经是AMD Radeon 6600M and 6700M Series
说明显卡驱动已经安装成功了
接着测试显卡性能
$ fglrxinfo
display: :0 screen: 0
OpenGL vendor string: Advanced Micro Devices, Inc.
OpenGL renderer string: AMD Radeon 6600M and 6700M Series
OpenGL version string: 4.5.13399 Compatibility Profile Context 15.201.1151
$ fgl_glxgears
Using GLX_SGIX_pbuffer
2151 frames in 5.0 seconds = 430.200 FPS
2040 frames in 5.0 seconds = 408.000 FPS
去试试吧， 伙伴们！
最后上一张我配置的Debian 8，主题是Paper
