Yes
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My mbp8,2 dont boot up with enabled dgpu.
At first time I use nvram command from single boot then reboot. Then I remove all AMD kexts and system normally boot up, but I lose brightness control and sleep. And I put back three kexts, amd legacy framebuffer and support, and amd controller, rebuild kextcache, reboot. System start up normal, brightness control and sleep works.
This method works for me, but mbp often selfreboot after sleep, sometimes not.
If I totally remove all AMD kexts, mbp also selfreboot sometimes.
@fotism, in attach.
After put it to system folder, do in terminal
sudo chmod -R 755 /System/Library/Extensions/AMD*.kext
sudo chown -R root:wheel /System/Library/Extensions/AMD*.kext
Sorry for my English.