Serial-device problemsUse this information to solve problems with serial ports or devices.• “Number of displayed serial ports is less than the number of installed serial ports” on page 155• “Serial device does not work” on page 155Number of displayed serial ports is less than the number of installed serial portsComplete the following steps until the problem is solved.1. Make sure that:• Each port is assigned a unique address in the Setup utility and none of the serial ports is disabled.• The serial-port adapter (if one is present) is seated correctly2. Reseat the serial port adapter.3. Replace the serial port adapter.Serial device does not work1. Make sure that:• The device is compatible with the server.• The serial port is enabled and is assigned a unique address.• The device is connected to the correct connector.2. Reseat the following components:a. Failing serial device.b. Serial cable.3. Replace the following components:a. Failing serial device.b. Serial cable.4. (Trained technician only) Replace the system board.Intermittent problemsUse this information to solve intermittent problems.• “Intermittent external device problems” on page 155• “Intermittent KVM problems” on page 156• “Intermittent unexpected reboots” on page 156Intermittent external device problemsComplete the following steps until the problem is solved.1. Make sure that the correct device drivers are installed. See the manufacturer's website fordocumentation.2. For a USB device:a. Make sure that the device is configured correctly.Restart the server and press F1 to display the Lenovo XClarity Provisioning Manager system setupinterface. Then, click System Settings ➙ Devices and I/O Ports ➙ USB Configuration.b. Connect the device to another port. If using a USB hub, remove the hub and connect the devicedirectly to the compute node. Make sure that the device is configured correctly for the port.Chapter 4. Problem determination 155
