Dell PowerEdge M420 Hardware Owner's Manual - Page 295

Troubleshooting the iKVM Module Problem: When using iDRAC video\console redirection you cannot see video through the iKVM when you switch to a blade running Linux. Likely Cause and Solution: A monitor or KVM appliance with a lower resolution has recently been added. Example: A blade running X Windows under Linux is inserted and powered on. A user connects to the blade in OS GUI mode via the iDRAC and a video resolution is detected and hard-set for that session. A monitor or KVM appliance is attached to the front or rear iKVM interface on the M1000e enclosure. The monitor or the KVM appliance is configured with a resolution LOWER than the currently configured resolution in the X-Window session on the Linux blade. When you select the Linux blade using the front or rear port on the iKVM, the iDRAC circuit adopts the lower resolution of the external connected devices. The video on the lower resolution monitor or the KVM appliance is not displayed until X Windows is restarted (iDRAC video should still be viewable.) Solution: 1 From the iDRAC session, exit and re-enter GUI mode. The lower resolution is communicated and utilized. 2 Set all monitors or KVM appliances connected to the M1000e enclosure to the same resolution or higher as configured on the Linux blades in GUI mode. 3 From the lower resolution monitor (no video displayed) press to change to the non-GUI login screen. 4 Restart X Windows to detect and utilize the lower resolution. Troubleshooting Your System 295