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I successfully installed High Sierra with clean-install. Everything is fine, except sleep-wake. My monitor goes blank and no HDMI signal after wakeup. However sleep-wake on my build works great (most of times) in Sierra and El Capitan. I've tried edit config.plist and smbios, but that doesn't...

Last night I successfully installed High Sierra. The system was working fine, no kernel panic at all, but my monitor didn't wake after sleep. It showed only 'NO HDMI SIGNAL' but the fan and cpu were still working. Anyway, I never encountered any problem like this in Sierra (10.12.6), even in El...