mpolo

Not sure if this will help anyone but I came here during my diagnosis of similar DPC latency issues. It was on a HP notebook (8540w) At first it appeared to the the nvidia display driver but after uninstalling it then appeared to be the ataport.sys driver. Eventually though, I saw a mention of a faulty power supply causing similar issues, the one hardware item I never suspected! Running on battery improved the situation, and using the same troublesome powersupply on another HP laptop slowed it right down. With the new powersupply, latencymon is still saying that there _might_ be slowdowns, but from a benchmark perspective it is running normally again. Something to keep in mind, Michael