23" Apple Cinema HD Display & Mac Pro (Power Button Issue)

I have a 23" Apple Cinema HD Display (pre-aluminum model) hooked up to a Mac Pro (early 2008 model) via the Apple ADC-DVI converter. This display has two buttons (brightness and power control) which I can enable/disable in the display preferences. They do not react at all when disabled (surprise, surprise) and they do, when enabled (they flash when being pressed). The brightness button brings up the display preferences panel (brightness settings) and makes it disappear, when being pressed again. Up to this point it's all the way I would expect it. But: the power butten flashes too when pressed, but nothing else happens. With my previous Power Mac G5 (Tiger) it used to start/wake the machine or - when awake - put it back to sleep respectively and that is what I basically want it to do with my Mac Pro. Are there any ideas on what I might be missing here? As the brightness button still works as expected, this looks like a software (Leopard) issue to me.
Oliver

I think we may have traded posts in another thread about this, but just confirming: you still have the kernel-panic-on-wake issue even after upgrading to 10.5.2? That cleared it up for me.
If you do ... do you by chance have anything plugged into the MacBook Pro's left USB port when it crashes? You might want to try leaving that port free when the machine is sleeping. A colleague swears that the left port is slightly underpowered, leading to all kinds of USB oddities when used, including kernel panics.

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