On a Dell E6500 set to the "Balanced" power scheme, when Vista puts the monitor to sleep the internal network card also goes to sleep. Setting Vista to not turn off the monitor also keeps the network alive.
The network card is an Intel 82567LM gig card running driver 188.8.131.52. In the Power Management options on the network card, the only options are "Reduce Link speed during battery operation" (unchecked) and several "Wake on XXX Packet" options.
Any idea how to keep the network card on even when the monitor goes into sleep mode?