wei@wei-Lenovo-G475:~$ lspci | grep VGA
00:01.0 VGA compatible controller: Advanced Micro Devices [AMD] nee ATI Wrestler [Radeon HD 6320]
01:00.0 VGA compatible controller: Advanced Micro Devices [AMD] nee ATI Robson CE [Radeon HD 6370M/7370M]
wei@wei-Lenovo-G475:~$ lspci -vnn | grep '[030[02]]'
00:01.0 VGA compatible controller [0300]: Advanced Micro Devices [AMD] nee ATI Wrestler [Radeon HD 6320] [1002:9806] (prog-if 00 [VGA controller])
01:00.0 VGA compatible controller [0300]: Advanced Micro Devices [AMD] nee ATI Robson CE [Radeon HD 6370M/7370M] [1002:68e4] (prog-if 00 [VGA controller])
wei@wei-Lenovo-G475:~$ ls /proc/acpi
button event wakeup
wei@wei-Lenovo-G475
以上是我的显卡信息。我装上了AMD的闭源驱动，散热还是不行。在网上查，说是关掉一个显卡就可降低功耗。我应该怎么关掉一个AMD显卡？