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My laptop is AW M17X R4 , i7-3610QM, HD4000 + AMD 7970M(disabled). The HDMI output worked in 10.11 but failed after 10.13 High Sierra installed. Here are the DSDT,SSDT and config.plist patched.zip Here are the kext. Other.zip So could someone tell me what's the reason? UPDATE: The reason seems to be the SSD. I used an OEM version Intel 520 and I also tried Intel 525, the HDMI output didn't work. But it worked after I install the system into an Intel X25-M or a Sandisk SSD PLUS. Since the both Intel 520 and 525 is based on SandForce 2281 chip ( while Intel X25-M and Sandisk SSD PLUS is not ), is it possible that there're some compatibility problems for SandForce 2281 SSDs？