I just installed Debian Wheezy 7.1.0 on an Intel vPro System (Intel Core i5-2520M, SuperMicro MBD-X9SCV-Q-O). Intel AMT's KVM works perfectly until Debian has completed booting and shows the login prompt. At this point, the screen in RealVNC goes blank and after a minute, it dies with the following error message:
Error 0x80862000: Unsupported or inactive display adapter
Before it dies, while the screen is already blank, I can type my login info, and if I then type
reboot, the server restarts. So, Debian is actually running as expected, just the display isn't working.
The system does not have any additional video cards installed, only the CPU-integrated one.
Here is what I think is going on: Debian detects that there is no monitor connected to the video card and then decides to switch the video card off to save energy (maybe some sort of headless mode). This in turn makes it impossible for Intel AMT to provide the frame buffer.
Assuming my assessment is right (otherwise please correct me), I am trying to figure out the following:
Is there a way (preferably a boot-time kernel option) to tell Debian to keep the video card enabled even if there is no monitor connected?