ISR goes to 100% after I plug a VGA screen into my RT desktop

Hi, has anyone seen this - my RT system is running smoothly until I plug a normal VGA screen into the RT desktop.  Then the ISR  CPU usage jumps to 100% (see attached image).  This prevents any of my RT timed loops or other processes from running and the whole system is useless. This does not happen if the VGA screen is plugged in already when the RT system boots up.
Any help or comments will be appreciated.
Attachments:
IMG_0483.JPG ‏257 KB

Hey,
Actually, we ran into something very similar on a platform we were evaluating - it turns out that the BIOS had specific video interrupts enabled and when the VGA was unplugged or plugged after the controller was up the interrupts fired.  Those interrupts are not supposed to fire unless the OS registers an interrupt handler for them, but alas they were firing anyway.  Since there was no handler, the RT OS is throwing the interrupt away, but the device keeps insisting it needs servicing - a loop that blows the system to hell.  You need a new BIOS update that handles this correctly - when we ran into this problem, we were able to work with the BIOS developers to disable these interrupts; if this is an off-the-shelf system you probably don't have this kind of support from the vendor. 
Good luck.
-Danny

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