DQ77KB 100% kworker or high pitch noise

Hi,

I have an Intel motherboard DQ77KB which has a 2-pin header which says 
panel_off and a fresh Ubuntu 12.10 (3.5.0-18-generic
) install and a display connected via Displayport (DP1, not eDP1). If I 
connect the header in the running system a kworker process pops up with 
100% cpu usage. If I leave the header unconnected no kworker process 
runs, which is good, but a pitch noise comes from the motherboard, 
probably from some voltage regulators.

I am no programmer, and I don't understand much about the kernel. But I 
would like to get the problem solved. If I can be any help, please let 
me know.

Kind regards
Timo
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