Acer Aspire D255E configured with Win7. WiFi trumps Ethernet connection when both are engaged. In order to use the wired LAN connection, the WiFi must be disabled. When this laptop is running Ubuntu, LAN trumps WiFi as expected: therefore not a hardware issue.
When Ethernet is connected, WiFi takes a back seat: likewise when Ethernet is disconnected, WiFi is engaged
How is WiFi configured to be secondary to Ethernet?