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Thread: Laptop Overheating in Karmic

  1. #1
    Join Date
    Jan 2006
    Beans
    7

    Laptop Overheating in Karmic

    I think it started to happen ever since I installed the updates in Karmic including the new kernel ( now going back to kernel never really helps )
    You can see the output here :
    nishant@ubuntu:/proc/acpi/thermal_zone/THRM$ cat *
    <setting not supported>
    <polling disabled>
    state: ok
    temperature: 85 C
    critical (S5): 98 C
    passive: 90 C: tc1=2 tc2=3 tsp=50 devices=CPU0
    It always hover around 85 and if I really start any apps it shuts down .
    Windows is a lot cooler ( no puns intended ) .
    Can anyone tell me whats the root cause ?

    Rgds
    Nishant

  2. #2
    Join Date
    Jul 2006
    Location
    United Kingdom
    Beans
    125
    Distro
    Kubuntu 11.10 Oneiric Ocelot

    Re: Laptop Overheating in Karmic

    I have a rather similar problem
    Code:
    cat /proc/acpi/thermal_zone/THRM/*
    <setting not supported>
    polling frequency:       2 seconds
    state:                   ok
    temperature:             55 C
    critical (S5):           101 C
    passive:                 101 C: tc1=9 tc2=2 tsp=1800 devices=CPU0
    active[0]:               101 C: devices= FAN
    active[1]:               101 C: devices= FAN
    I have my fan running continuously on high to maintain this temperature by using toshset -fan high but even so acpi thinks the fan is off. (as I have a toshiba latptop)
    Code:
    cat /proc/acpi/fan/FAN/state
    status:                  off
    It seems to me that the default trip points are set to a silly value - if I understand the output correctly acpi will allow the processor to reach a critical temperature of 101c before it bothers to turn on the fan. I don't know what it plans to do to the processor with tc1=9 and tc2=2 but I hope tsp=1800 does not mean it will try to change the processor speed to 1800MHz as the speed range for my processor is only 600 - 1500
    acpitool does think my fan is on though, which is something I suppose

    It looks like thegladiator has stupid trip points set as well - not a friendly thing for Karmic to do IMHO

  3. #3
    Join Date
    Jan 2006
    Beans
    7

    Re: Laptop Overheating in Karmic

    Thanks for that .

    My typical output for top is like this . Infact FF might go to 15-20% at times . I just went for a break of 10-30 mts and still showing 83 . Very high for an OS I think , Windows doesnt heat like this .
    Tasks: 160 total, 2 running, 158 sleeping, 0 stopped, 0 zombie
    Cpu(s): 4.6%us, 2.7%sy, 0.0%ni, 91.2%id, 0.2%wa, 1.3%hi, 0.0%si, 0.0%st
    Mem: 500120k total, 466296k used, 33824k free, 36240k buffers
    Swap: 538092k total, 120936k used, 417156k free, 192132k cached

    PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
    2242 nishant 20 0 381m 100m 21m S 3.8 20.7 19:22.33 firefox
    1003 root 20 0 59752 16m 6992 R 1.7 3.3 3:54.36 Xorg
    2672 nishant 20 0 59104 9940 6156 S 0.4 2.0 0:05.04 gnome-terminal
    800 messageb 20 0 3880 1448 716 S 0.2 0.3 0:01.54 dbus-daemon
    1473 postgres 20 0 45320 440 368 S 0.2 0.1 0:00.87 postgres
    1508 root 20 0 22616 828 692 S 0.2 0.2 0:20.73 cpufreqd
    1809 nishant 20 0 95992 7896 4260 S 0.2 1.6 0:53.24 compiz.real
    2642 nishant 20 0 69356 15m 7292 S 0.2 3.1 0:30.90 xchat
    4676 nishant 20 0 187m 40m 16m S 0.2 8.4 1:47.99 totem
    5617 nishant 20 0 2468 1184 884 R 0.2 0.2 0:00.07 top

  4. #4
    Join Date
    Jul 2006
    Location
    United Kingdom
    Beans
    125
    Distro
    Kubuntu 11.10 Oneiric Ocelot

    Re: Laptop Overheating in Karmic

    I have just tried installing powersaved (as mentioned in some other posts such as http://ubuntuforums.org/showthread.p...ht=trip+points)
    I added some more trip points to the file /etc/powersaved/thermal and rebooted.

    The fan comes on at around 66 or more (as it used to - now don't ask me what is bringing it on at low speed at that temp, I have no idea) and then off again.
    The trip points in my thermal zone are as they were according to a cat of THERM and powersave -T shows the same set of trip points i.e the ones I entered in the powersave config file are not being taken into account.
    If I switch the fan on with toshset both a cat of FAN/state and powersave -F show the fan to be off.

    So, no progress and two problems as far as I can see
    One - the trip points found in THERM are not sensible
    Two - something else apart from acpi is involved in controlling the fan

    On top of this powersaved does not seem to do what it is supposed to do.

  5. #5
    Join Date
    Jan 2006
    Beans
    7

    Re: Laptop Overheating in Karmic

    Installing power saved itself made a huge difference and my temp is around 70C now .I will try the steps u mentioned and play around with trip point and see how better we can make it .

    But it seems that the frequency of the laptop has gone down to 1.33 GHZ from 1.87 GHZ .
    Is that a tradeoff involved ? Is there way any we can make the CPU at its best and then deal with this heating issue ?

    Thanks
    Nishant
    Last edited by thegladaitor; December 12th, 2009 at 09:07 PM.

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