It looks from the evidence like repeater mode on Intel graphics enabled HDMI is not working. Plug Intel-enabled HDMI motherboard into an A/V receiver with an HDTV on the other end: HDCP device invalid error. Plug Intel-enabled HDMI motherboard into a TV: Blu-ray disks will play. It is this condition which appears to be broken. Sound familiar? An A/V receiver which is passing HDCP-protected data onward (presumably to another HDCP device like an HDTV) is acting as a repeater, and will report itself as such. A repeater is, at its most simple, a device which will be passing the HDCP-protected signal on to another sink device somewhere downstream. When the handshake occurs between the source device and the sink device, a valid sink must inform the source whether it is a "repeater" or not. HDCP has provisions for this usage model, in fact.
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