Mysterious "hibernate" with CentOS 6, cannot disable.
I have a server (Dell PowerEdge 9550, if I remember right) running CentOS 6.0 in the GUI mode (Gnome).
I have disabled all screen saver and power-saving options, as well as completely remove the power management modules, but I keep running into this problem.
What happens is, if a "vncserver" session is left running for multiple hours (not exactly sure what the time frame is, but somewhere within 12 hours), the server will go into a hibernate-like mode. At this point, all remote services are disabled, and a friend has to manually power cycle the machine since the keyboard and reset button seem to do nothing (power light is on, but no HDD activity).
I connect to this server with SSH, then tunnel with VNC to control the desktop environment. I've discovered this problem when I've left the session open so I could return to my testing, but we do hope to turn it into a production server for a university project.
I just did a test of this last night and its locked up again -- no programs were running, just the VNC service.
Any ideas? Where should I be looking in logs for this? Has anyone even heard of a problem like this before?