macbook pro 2011-2012款独立显卡造成无法进入系统（伴有花屏、蓝屏等问题），关闭独立显卡切换集成显卡解决

1.前言：macbook pro无法进入系统有一段时间了，之前折腾过一阵子，费心费力还是没解决，最后放弃。这几天又没忍住，从前天晚上就开始瞎折腾了，幸亏工具不全，不然真的就给拆机了，哈哈哈！今天一从早上到现在，终于折腾好了。外面下着雨，心里却是晴天，哈哈哈！

2.解决：

1.boot using Command + s
2.manually type nvram fa4ce28d-b62f-4c99-9cc3-6815686e30f9:gpu-power-prefs=%01%00%00%00 and run it
3.manually type nvram boot-args="-v" and run it
4.reboot
5.boot using Command + r (this time it boots fine, no grey screen)
6.disable SIP: manually type csrutil disable and run it
7.manually type nvram fa4ce28d-b62f-4c99-9cc3-6815686e30f9:gpu-power-prefs=%01%00%00%00 and run it
8.manually type nvram boot-args="-v" and run it
9.reboot
10.boot using Command + s
11.manually type /sbin/mount -uw / and run it
12.manually type mkdir -p /System/Library/Extensions-off and run it
13.manually type mv /System/Library/Extensions/AMDRadeonX3000.kext /System/Library/Extensions-off/ and run it
14.manually type touch /System/Library/Extensions/ and run it
15.reboot

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3.注意：

最好是严格按照上面的步骤来，如果有遗漏可以重新开始；
我有卡在cxrutil disable上，因为没权限，后来按照步骤重新开始就好了。

4.参考：

主要：Works for macOS Sierra and High Sierra (Improved version)

其他：

• How to fix 2011 15'' Macbook pro GPU problem
• mbp2011-disable-amd-gpu.md
• How to Repair Your Mac’s Disk Using Safe Mode, fsck, and More
• Single-User-Recovery-Mode on High Sierra 10.13.6
• How do I disable System Integrity Protection (SIP) AKA “rootless” on macOs [OS X]