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Ubuntu runs hot

Discussion in 'Linux & Open Source' started by manic111, Dec 5, 2008.

  1. manic111

    Capodecina

    Joined: Jul 1, 2007

    Posts: 14,152

    Location: Various

    In Vista my CPU (e4500 @ 2.8Ghz and stock volts) idles between 28 and 32. In Ubuntu Intrepid it idles between 47 and 51. I am taking my readings using lm-sensors, and my power settings are "on demand" (tends to run at 1.2Ghz), but even when I set it to conservative or power saving settings it still runs this hot. Any ideas why? Cheers!
     
  2. MikeHunt79

    Capodecina

    Joined: Jan 4, 2004

    Posts: 20,838

    Location: ¯\_(ツ)_/¯

    Most likely speedstep isn't working in ubuntu
     
  3. BigglesPiP

    Capodecina

    Joined: Mar 8, 2006

    Posts: 13,235

    Location: Chandlers Ford

    I see you've confirmed that speed step probably is working, how are you measuring these temps?
     
  4. manic111

    Capodecina

    Joined: Jul 1, 2007

    Posts: 14,152

    Location: Various

    I'm measuring the temp using lm-sensors, having gone through the whole sensors-detect rigmarole! Speedstep is working fine, the CPU speed tends to sit around 1.2Ghz most of the time, going up to 2.2Ghz (for some reason it ignores my overclock) if I'm doing something intensive.
     
  5. BigglesPiP

    Capodecina

    Joined: Mar 8, 2006

    Posts: 13,235

    Location: Chandlers Ford

    It can't ignore you overclock if it's set in the BIOS.
     
  6. manic111

    Capodecina

    Joined: Jul 1, 2007

    Posts: 14,152

    Location: Various

    Meh, maybe it's just reading my CPU's speed. I'm not too fussed anyway, all I do in Ubuntu is web browse and write word documents. The excess heat is worrying me much more, have you got any ideas about that?
     
  7. FirebarUK

    Soldato

    Joined: Dec 9, 2004

    Posts: 5,530

    Location: Dorset

    Perhaps LM-sensors is reading the temps correctly?

    What app/utility do you use in Vista?
     
  8. manic111

    Capodecina

    Joined: Jul 1, 2007

    Posts: 14,152

    Location: Various

    I've verified the ones in Vista by using Speedfan, Coretemp, Intel TAT and Gigabyte's own monitoring program-all match up. Plus my CPU fan is set in the BIOS not to turn on until the CPU temp reaches 20, and when it crosses the 20 threshold in the monitoring apps in Vista it starts spinning up. Pretty strong evidence that the temps are being read correctly in Vista :)

    I'm not saying that LM-sensors is not correct though; I wouldn't be surprised if it was correct, as my CPU fan works far harder in Ubuntu than it does in Vista. I'm just trying to work out why Ubuntu runs so much hotter...


    While we're at it, I can't get my computer to resume from standby in Ubuntu. Any ideas about that as well?

    Cheers :)
     


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