I know it says that but it doesn't happen. I do not have rear surrounds either. But still sets itself to IIx. I don't know enuf about the modes to know but I do wonder whether or not I am losing signal if the processor is pumping IIx but no rears are installed. If IIx is for 7.1 emulation and it converts to 5.1 when rears are turned off why not display it?
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Sparkyfan

Sony KDS60A3000
Panasonic XP-50
Outlaw Audio 990 Receivers (2)
Outlaw Audio 7125 Amps (2)
Outlaw Audio 7125 Amplifier
Paradigm Studio 40's
Paradigm Studio CC
Paradigm ADP-470
2-SVS 20-39 / S700
Outlaw Audio X13 Ultra
Past Owner of:
Outlaw Audio 1050
OUtlaw Audio 1070
Outlaw Audio ICBM