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Sleep / Standby HDMI displays same as DisplayPort. [CEC over DP aux]

Question asked by variable on Dec 4, 2016

I would like my HDMI display to sleep when my computer puts the DisplayPort displays to sleep and wake when it wakes the same. As far as I can see, this would require use of a DisplayPort to HDMI adapter and either a DisplayPort aux to HDMI conversion of CEC information or the adapter itself to output CEC commands. I have a club-3d CAC-1070 and thus the underlying PS176 chip, which does support this functionality [at least from its spec sheet].  So is this possible?