Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

Testing on two older laptops:

  • Compaq Presario A900 with Ubuntu 10.04 (2.6.32-24 kernel)
  • Gateway ML6720 with Fedora 13

both freshly updated, I noticed both of them have the same problem:

  • Nothing in /proc/acpi/fan
  • In the only thermal zone, ls /proc/acpi/thermal_zone/TZ01 gives:

cooling_mode polling_frequency state temperature trip_points

  • cat /proc/acpi/thermal_zone/TZ01/* gives:
<setting not supported>
<polling disabled>
state:                   ok
temperature:             55 C
critical (S5):           100 C

or such under normal load (i.e. temperature is ~45-55*C under normal load, such as when browsing Web like now).

Obviously, there's no ACPI support for fan control. sensors gives this:

Adapter: Virtual device
temp1:       +55.0°C  (crit = +100.0°C)                  

Adapter: ISA adapter
Core 0:      +49.0°C  (high = +100.0°C, crit = +100.0°C)  

Adapter: ISA adapter
Core 1:      +50.0°C  (high = +100.0°C, crit = +100.0°C)  

If you have or had any of the above models, did you have CPU overheating issues? For example, I can easily make CPU temperatures up to 85-90*C in a minute or two of hard work. This all with a fan underneath and another that helps the poor CPU fan.

I am also confused:

  • Windows Vista doesn't have any issues like this. E.g. Flight Simulator brings it to ~65-70*C
  • If there's no ACPI, I assume motherboard is controlling the CPU fan speed according to the current temperature. What's it doing letting it go to 80-90*C?

What temperatures are you experiencing during normal and hard CPU-bound tasks? I highly doubt it, but I have to check - maybe this is normal...

Lastly, I'm surprised I'm seeing this on much newer laptops (e.g. or even a mix of them (see e.g. Just wondering how people use Linux if so many people have issues on laptops...

share|improve this question

closed as too localized by Sathya Nov 1 '12 at 7:04

This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. For help making this question more broadly applicable, visit the help center.If this question can be reworded to fit the rules in the help center, please edit the question.