USB was still powered while the ps3 was in sleep mode if you enabled remote connection w/ your psp. That was pre-1.9 (i think). A random firmware update after that removed that bug (feature) and it hasn't been turned back on yet unless they did it this morning.
I think prior to 1.80 (assuming that's a correct number) the USB ports remained powered on so that the Schmartstuff PS3IR on/off dongle allowed you to power on the PS3 (you had to enable "remote play" with a PSP and pair it first though - which I did). After 1.80 (again the number could be wrong) Sony disabled the USB power when the PS3 was powered off and the "on" function was killed.
Well, I dunno if they re-enabled it, but my PS3 kept auto-starting when I was playing around with the Remote Play auto-start feature last night. I had to disable that feature because my PS3 would just automatically come on when nothing was pressed.
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