In general USB ports on powerbooks are underpowered. It may not put out enough power to power the tablet. Thus on waking it doesn't always give it enough juice to ID the tablet. When you restart, USB items are checked later in the process (after drive spinup) so more power is available to USB items.
I'm hardpressed to believe this, as the USB driver chip controls the current, and Apple has to buy those. Besides which, I'm sure midst all the cross-licensing agreements is the one that sez 'it must conform or you can't call it "USB"..'
Startup is a different matter. USB specs call for starting up with 100mA, and only going to 500 when the device requests it. SO I suspect diver issues.
That said; I had lots of issues with OS9 & USB. Many a device, external power or not, would not discover unless it was existing at bootup. Others STALL the boot if it's plugged in. [A ?Compucable? iMac docking
platform with USB hub and serial ports.] You end up unplugging it until
the extensions start to load, THEN quickly restoring it....
OSX seems better; at least when my KB vanishes, I unplug, one-potato, two-potato, restore, and it rediscovers.
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