The button for "Reset HDMI" in the Diagnostics menu is greyed out The information seems to point to my receiver "seeing" my tv... has manufacture date, tv type, dimensions etc.
For the first time since I've had my 622 (Feb. 2007) I had a problem with the HDMI connection. Video went out but still had sound (after slightly moving box). Soft reboot brought it back. Pretty sure I could have brought it back with the HDMI reset. Hopefully it is not greyed out due to DRM and it will come back in a future update.