laptop i3 cpu strange high temps

Hy guys, this is my first time posting here, and I really hope someone can give me some advice. So a friend of mine asked me to have a look at her laptop, an HP Pavillion dv6, that seemed to heat up and was running very slow in Windows.

The problem seems to be, that the cpu temperature probe shows weird readings. At boot it shows EXACTLY 58C and after a minute or so, it jumps directly at 85C (even at idle). It doesn't show any value in between the two. I tried different programs, same result. Note that this is just the overall cpu temperature sensor, each core individually show normal temperatures, at around 40C at idle, and it seems to max around 65-70C.
Also, because of the high temperature, Windows seems to throttle the CPU at the lowest frequency possible (around 940mhz). I tried booting in linux mint, from a live usb, and it showed the same temperatures, although it didn't experience the CPU throttle.

I already tried changing the thermal paste and making sure the heatsink is clear of dust.

BTW, this is a i3 M 370 CPU, in case it matters.
Any help is appreciated.
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  1. I'm going to assume the laptop had overheated previously (to the point of shut down). If so then the thermal sensors will take a little while to settle down completely. In the mean time, using a laptop cooler and coping with meaningless throttling (it'll keep doing that through a few usage cycles) can't really be prevented. If it continues that behavior after a few weeks (mine took almost a month to settle down) or the temps start to rise, then perhaps replacement of the fan or thermal pads (if used and not already replaced) may be in order. I will suggest a laptop cooler though, IMO it does help (no scientific basis for my opinion here)
    Hope it helps
  2. anonymous1 said:
    I think that the DV6 line all have a overheating problem as the heat sink also works for the graphics as well.

    Yeah, I know. I already found out that pretty much any HP laptop overheats :)
    My problem seemed a little different, in that the sensor only showed 2 values: 58C and 85C. So it seems kinda stuck.

    Anyway, it seems that C12Friedman might be right. The throttling seems to have stopped for now when using the high performance power setting. It still persists on the other settings and the temp still shows 85C, but maybe it will solve itself in time.
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