1.5b4 Mac Pro hangs on system sleep, does not put monitors into power saving mode.

[SpyderZ]

Hi Patrick,

This is my setup.

Six LG L206WU monitors.

Two running on the NVida graphics card.
Four running on DisplayLink USB.

I have a Wacom Tablet and external hard drive attached to USB.

I have uninstalled the DisplayLink drivers and unattached the monitors and the system operates flawlessly. When I put them back, the problem comes back.

1. System Sleep Hangs
2. Reset Hangs
3. Turning monitors off with the Mac shortcut causes monitors to go into blank mode, not power saving mode.

Also, after a refresh start about 5-10 minutes afterwards four warning boxes pop up indicating that four USB drives can not be ejected. Do I want to Eject or Ignore? I hit Eject, and nothing happens.

I know after 10.5.8 there were some improvements on USB drive handling. This is probably what is causing the conflict where the system can't properly ignore the USB drive on the monitors or send the proper shutdown signal.