Hi,
I have a problem with a bunch of Intel DQ67SW motherboards. When the BIOS is updated to the latest (v0067) then the LAN port starts flapping its network connection on and off a few times every second when the PC is off (connected to mains and LAN, but not running OS - so can be WoL remotely).
Logs from the local HP switch:
I 04/30/15 12:39:50 ports: port 6 is Blocked by STP
I 04/30/15 12:39:52 ports: port 6 is now on-line
I 04/30/15 12:40:05 ports: port 6 is now off-line
I 04/30/15 12:40:07 ports: port 6 is Blocked by STP
I 04/30/15 12:40:09 ports: port 6 is now on-line
I 04/30/15 12:40:21 ports: port 6 is now off-line
I 04/30/15 12:40:24 ports: port 6 is Blocked by STP
I 04/30/15 12:40:27 ports: port 6 is now on-line
I 04/30/15 12:40:38 ports: port 6 is now off-line
I 04/30/15 12:40:41 ports: port 6 is Blocked by STP
I 04/30/15 12:40:44 ports: port 6 is now on-line
I 04/30/15 12:40:56 ports: port 6 is now off-line
I 04/30/15 12:40:58 ports: port 6 is Blocked by STP
I 04/30/15 12:41:00 ports: port 6 is now on-line
I 04/30/15 12:41:13 ports: port 6 is now off-line
I 04/30/15 12:41:15 ports: port 6 is Blocked by STP
Eventually our local switch has enough and blocks the port.
I have tried various settings with the Windows drivers for energy efficient ethernet on and off, fixed 100MB/full duplex both ends but nothing seems to make a difference. The driver version also makes no difference (tried various ones from 17.3 to 19.1 latest).
At first I thought it was a hardware fault - but it is reproducible across 3 motherboards now.
I have not tried rolling back BIOS version by BIOS version to see when this behaviour started. It was not flapping with v0053.
When the PC is on it is fine and usually behaves normally. The PC is booted every morning but randomly (2 or 3 times a month) the LAN card will not connect with the local network.
The wiring has all been checked, tried different wall port - the problem follows the machine, tried different patch leads again the problem remains.
Any suggestions or pointers?
Thanks
Ian