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Thanks for this brilliant article! It helped us tracking down high CPU usage on HP 6930p and HP 2530p series notebooks. In our case, the driver was dxgkrnl.sys which indicates outdated graphic card driver. For all HP 6930p / 2530p users with Intel graphic chip-sets: It's a good idea to use the original Intel drivers and not the HP branded ones - the latter ones are outdated and my cause this high CPU usage behavior (at least on Vista 64 bit) best regards, Martin