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**kevinc** · Sep 24, 2009, 10:57 AM

Re: Unexpected shutdown due to critical temperature

Have you thought about trying one of those cooling pads? They have fans underneath and connect by USB cable to your notebook and claim to keep the temperature down.

**muzicman0** · Sep 24, 2009, 10:49 PM

Re: Unexpected shutdown due to critical temperature

The failed test is a big deal, but was probably caused by heat. if it is getting to 144 degrees CELSIUS, that is way too hot. I would guess that the fans aren't working, or the heatsink isn't set properly (or both). If it is a new laptop still under warranty, send it in. If it is old, find a service manual, and re-attach the heatsink with a good quality thermal paste.

For a reference, my CPU idles at between 35 & 38 degrees celsius, and when I am pushing the CPU, might get into the 50's. I saw it hit 68 once, and started to get worried.

Keep in mind, even though it says 50 - 70C, temps rise on CPU very fast...depending on the speed of the updates, it still may actually be hitting the high temp.

mm0

**arochester** · Sep 25, 2009, 01:32 AM

Re: Unexpected shutdown due to critical temperature

If it is a new laptop still under warranty, send it in

If it is an old(er) laptop it may have a build up of fluff in the fan. Especially if you don't always put it on a hard surface and put it e.g. on carpet, on bedding or straight on your lap.

There was an issue a few years ago about fans running overtime. What version of Kubuntu are you using?

**kln** · Sep 25, 2009, 03:47 AM

Re: Unexpected shutdown due to critical temperature

It is a new laptop, bought in February this year. Before sending it back - it takes two months - I want to check that it is not a bug from Kubuntu. (I am using Intrepid 8.10)

I have a temperature display graph on my desktop all the time and the CPU temp is always between 50 and 70. It has to be a bug, because the temperature is always 144C and it is impossible to reach that level in a second ! I could keep my eyes on the sensor graph and see 65C, then suddenly the shutdown and so-called 144C ... Fan are working according to the trip points I set. It may be a heatsink problem, but then, why is it not just all the time overheating and gradiently becoming too hot ? No, I reckon this is a temporary bug ...

I would like to avoid going with an additional cooling system on a new laptop, but I'll think about it in a few years time.

**arochester** · Sep 25, 2009, 04:49 AM

Re: Unexpected shutdown due to critical temperature

Try upgrading to 9.04 and see if there is any improvement.

**dibl** · Sep 25, 2009, 06:25 AM

Re: Unexpected shutdown due to critical temperature

You could make a bootable Live CD of another (non *buntu) Linux distribution, and run that for awhile to raise your confidence that the problem is in the hardware and not the OS. Some possibilities:

- Mepix
- sidux
- ELive (development version is free)

**vinnywright** · Sep 26, 2009, 08:57 AM

Re: Unexpected shutdown due to critical temperature

Hi,
I have installed a BIOS update given by the manufacturer (Zepto) of my laptop (Nox A14 - details in my signature), which was suppose to improve fan control and give the ability to set up thermal trip points. Since the update (which went ok), my laptop is frequently having the same problem : Critical temperature reached 144C - Shutdown. Black screen with that sentence, then Kubuntu shut itself down and the computer as well.

was it not over heating befor the BIOS update?

if no you mite consider wether the update had somthing to do wih it.

VINNY

**kln** · Oct 05, 2009, 03:25 PM

Re: Unexpected shutdown due to critical temperature

I am back to this problem after two weeks without internet ...

it was not overheating before the BIOS update, so I think the BIOS update might have sth to do with it. But the manufacturer (Zepto) said it hasn't been happening to other customers. I am thinking to upgrade to 9.04, but that usually need a lot of time to solve all issues happening during the upgrade. Also, what is the laptop switch off during the upgrade ?

kern.log shows this :

Code:

Oct 5 21:05:00 [username]-laptop kernel: [ 564.645725] ACPI: Transitioning device [FAN] to D3
Oct 5 21:05:00 [username]-laptop kernel: [ 564.645739] ACPI: Unable to turn cooling device [ffff88013fa38ec0] 'off'
Oct 5 21:05:00 [username]-laptop kernel: [ 564.656023] ra0: no IPv6 routers present
Oct 5 21:05:01 [username]-laptop kernel: [ 565.872042] ACPI: Transitioning device [FAN] to D3
Oct 5 21:05:01 [username]-laptop kernel: [ 565.872130] ACPI: Unable to turn cooling device [ffff88013fa38ec0] 'off'
Oct 5 21:05:06 [username]-laptop kernel: [ 570.845030] ACPI: Critical trip point
Oct 5 21:05:06 [username]-laptop kernel: [ 570.845056] Critical temperature reached (144 C), shutting down.
Oct 5 21:05:07 [username]-laptop kernel: [ 571.852907] ACPI: Critical trip point
Oct 5 21:05:07 [username]-laptop kernel: [ 571.852921] Critical temperature reached (144 C), shutting down.
Oct 5 21:05:09 [username]-laptop kernel: [ 572.859313] ACPI: Critical trip point
Oct 5 21:05:09 [username]-laptop kernel: [ 572.859335] Critical temperature reached (144 C), shutting down.
Oct 5 21:05:10 [username]-laptop kernel: [ 575.273225] ACPI: Critical trip point
Oct 5 21:05:10 [username]-laptop kernel: [ 575.273249] Critical temperature reached (144 C), shutting down.
Oct 5 21:05:11 [username]-laptop kernel: [ 576.289025] ACPI: Critical trip point
Oct 5 21:05:11 [username]-laptop kernel: [ 576.289055] Critical temperature reached (144 C), shutting down.
Oct 5 21:05:12 [username]-laptop kernel: [ 577.297308] ACPI: Critical trip point
Oct 5 21:05:12 [username]-laptop kernel: [ 577.297344] Critical temperature reached (144 C), shutting down.
Oct 5 21:05:13 [username]-laptop kernel: [ 578.301243] ACPI: Critical trip point
Oct 5 21:05:13 [username]-laptop kernel: [ 578.301287] Critical temperature reached (144 C), shutting down.
Oct 5 21:05:14 [username]-laptop kernel: [ 579.313201] ACPI: Critical trip point
Oct 5 21:05:14 [username]-laptop kernel: [ 579.313244] Critical temperature reached (144 C), shutting down.
Oct 5 21:05:15 [username]-laptop kernel: [ 580.329717] ACPI: Critical trip point
Oct 5 21:05:15 [username]-laptop kernel: [ 580.329813] Critical temperature reached (144 C), shutting down.
Oct 5 21:05:16 [username]-laptop kernel: [ 581.357734] ACPI: Critical trip point
Oct 5 21:05:16 [username]-laptop kernel: [ 581.357892] Critical temperature reached (144 C), shutting down.
Oct 5 21:05:17 [username]-laptop kernel: [ 581.712664] CE: hpet increasing min_delta_ns to 15000 nsec
Oct 5 21:05:17 [username]-laptop kernel: [ 581.712887] CE: hpet increasing min_delta_ns to 22500 nsec
Oct 5 21:05:17 [username]-laptop kernel: [ 581.840628] CE: hpet increasing min_delta_ns to 33750 nsec
Oct 5 21:05:17 [username]-laptop kernel: [ 582.371350] ACPI: Critical trip point
Oct 5 21:05:17 [username]-laptop kernel: [ 582.371636] Critical temperature reached (144 C), shutting down.
Oct 5 21:05:18 [username]-laptop kernel: [ 583.048262] CE: hpet increasing min_delta_ns to 50624 nsec
Oct 5 21:05:18 [username]-laptop kernel: [ 583.068762] CE: hpet increasing min_delta_ns to 75936 nsec
Oct 5 21:05:18 [username]-laptop kernel: [ 583.387358] ACPI: Critical trip point
Oct 5 21:05:18 [username]-laptop kernel: [ 583.387644] Critical temperature reached (144 C), shutting down.
Oct 5 21:05:19 [username]-laptop kernel: [ 584.398498] ACPI: Critical trip point
Oct 5 21:05:19 [username]-laptop kernel: [ 584.398785] Critical temperature reached (144 C), shutting down.
Oct 5 21:05:20 [username]-laptop kernel: [ 585.414908] Critical temperature reached (53 C), shutting down.
Oct 5 21:05:20 [username]-laptop kernel: [ 585.421924] ACPI: Transitioning device [FAN] to D3
Oct 5 21:05:20 [username]-laptop kernel: [ 585.421955] ACPI: Unable to turn cooling device [ffff88013fa38ec0] 'off'
Oct 5 21:05:21 [username]-laptop kernel: [ 585.681808] ACPI: Transitioning device [FAN] to D3
Oct 5 21:05:21 [username]-laptop kernel: [ 585.681844] ACPI: Unable to turn cooling device [ffff88013fa38ec0] 'off'

very strange, I have this 'unable to turn cooling device off' all the time, even when running normal.

this is proc/acpi/thermal_zone/THRM/trip_points :

Code:

critical (S5):      100 C
passive:         85 C: tc1=2 tc2=5 tsp=10 devices=CPU0 CPU1 
active[0]:        55 C: devices= FAN

proc/acpi/thermal_zone/THRM/polling_frequency : <polling disabled>

Is the app lm-sensors any useful ?
Also, many posts about this problem talk about ACPI settings.
What I need to know is whether this false value is given by Kubuntu, by the sensors or by the BIOS. It is always 144C

**dibl** · Oct 05, 2009, 05:30 PM

Re: Unexpected shutdown due to critical temperature

lm-sensors is only useful for finding sensors, loading appropriate modules, and then reporting sensor data -- it doesn't control anything.

Sounds like issues with power-control stuff. I'm no expert -- I guess you start down the list of powernowd, acpi, fancontrol, apic, lapic -- one of them isn't doing what it is supposed to do.

**kln** · Oct 06, 2009, 04:00 AM

Re: Unexpected shutdown due to critical temperature

If I try to upgrade to 9.04 and the computer switch off in the middle, what will happen ?
Is it better to upgrade from CD, is it possible ?

**dibl** · Oct 06, 2009, 04:29 AM

Re: Unexpected shutdown due to critical temperature

Originally posted by kln

If I try to upgrade to 9.04 and the computer switch off in the middle, what will happen ?

That's the one way I can think of to actually make it worse! :P

Why don't you make a Live CD from the 9.10 daily build, and boot it? You will find out quickly whether it seems to run cooler, and that will be a useful bit of information for you.

http://cdimage.ubuntu.com/kubuntu/daily-live/current/

**kln** · Oct 06, 2009, 07:21 AM

Re: Unexpected shutdown due to critical temperature

OK, I will try this.
Then I can know how my current drivers (and install procedures) will react.

**kln** · Oct 10, 2009, 12:06 PM

Re: Unexpected shutdown due to critical temperature

I tried Kubuntu 9.10 with the Live CD, ran many applications at the same time, well tried everything I can to make it heat up and no critical shutdown happened ! I'll try a second time to be sure, but the problem is probable having the new BIOS with Intrepid (or this install of Intrepid).
Back on my current 8.10 install, shutdown did occur another few times.

Btw, wireless driver and ntfs partition mounting working out of the box (no way it could access the fstab file of my current install I assume).
Only one thing was not working very well : when copying files to and from external drive/stick and internal partition, it was copying very fast at the beginning, then after a while slowing down, almost stopping. Sometimes, it stopped 3 seconds short of finishing and just stayed like freezed. I will try again to find out.

Should I switch to 9.10 now or wait next month for the official release? If I do switch now, will it be easy to get the subsequent fixes ?
As upgrading from the internet connection might hold the risk of shutting down in the middle of the upgrade, is it better to install from the CD ? Can I do so and still keep my settings and installed packages ?

**dibl** · Oct 10, 2009, 12:17 PM

Re: Unexpected shutdown due to critical temperature

The slowdown while copying files to/from a USB device is a known issue -- there's a long thread on Ubuntu forums on that topic. It's a kernel or libata driver issue -- users can't fix it.

Other than that, it sounds like you have found the solution to your overheating issue.

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[Solved] Unexpected shutdown due to critical temperature

[Solved] Unexpected shutdown due to critical temperature

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