I agree with cb above, in that the test tones should wake the sub. My receiver will output 10 pulses, and the sub is awake and firing fast enough to transmit seven of them. If the sub is physically turned on and the test tones are heard without an issue, there is no reason to believe this issue of not waking up is any fault of the receiver.
A work around obviously is to physically turn on and off the sub each time you watch TV, but obviously this is not ideal, especially on a new, expensive sub. Of course if there is any point in watching TV where there is no LFE for a while the sub may go to sleep anyway, and then you're back to square one.
