Update - I tried several things to get this resolved, and finally had some success. A full cold reset of the system did work. This required disconnecting the power cord for several minutes, and then restarting the system under Ubuntu 10.10. This is effective until a system reboot.
I had best results after I disabled Network Manager, and manually configured the network interface. This was effective through a number of reboots, and several weeks time. Unfortunately, this motherboard is currently dedicated for another purpose, and is not available for testing.
Update - I tried several things to get this resolved, and finally had some success. A full cold reset of the system did work. This required disconnecting the power cord for several minutes, and then restarting the system under Ubuntu 10.10. This is effective until a system reboot.
I had best results after I disabled Network Manager, and manually configured the network interface. This was effective through a number of reboots, and several weeks time. Unfortunately, this motherboard is currently dedicated for another purpose, and is not available for testing.