LP#370173
It seems there is a mix of issues here. For this bug we shall consider
the issue that the latest Jaunty kernel is perceived to fail to manage
the CPU temperature correctly and that it used to work correctly on
Intrepid. If you have a different issue please file a separate bug.
To confirm this issue that we need to compare at least these two
releases in a controlled manner. This will better allow us to confirm
that this is a regression. To better identify the location of this
regression and any potential fix it would be helpful to test the kernels
below. For those of you comfortable installing kernels and also able to
get their temperature information (either via sensors or another
method), it would be helpful to get comparisons of a number of kernels
(please pick one of the i386 or amd64 kernels to match your system). If
you have another version where you know the bug does not exhibit, it
would be helpful to include the same test results for that kernel too:
Intrepid Latest -- 2.6.27-14.34
http://launchpadlibrarian.net/27522947/linux-image-2.6.27-14-generic_2.6.27-14.34_i386.deb
http://launchpadlibrarian.net/27522807/linux-image-2.6.27-14-generic_2.6.27-14.34_amd64.deb
Jaunty Latest -- 2.6.28-13.44
http://launchpadlibrarian.net/27405830/linux-image-2.6.28-13-generic_2.6.28-13.44_i386.deb
http://launchpadlibrarian.net/27405998/linux-image-2.6.28-13-generic_2.6.28-13.44_amd64.deb
Mainline 2.6.28.x
http://kernel.ubuntu.com/~kernel-ppa/mainline/v2.6.28.10/linux-image-2.6.28-02062810-generic_2.6.28-02062810_i386.deb
http://kernel.ubuntu.com/~kernel-ppa/mainline/v2.6.28.10/linux-image-2.6.28-02062810-generic_2.6.28-02062810_amd64.deb
Mainline 2.6.30
http://kernel.ubuntu.com/~kernel-ppa/mainline/v2.6.30/linux-image-2.6.30-020630-generic_2.6.30-020630_i386.deb
http://kernel.ubuntu.com/~kernel-ppa/mainline/v2.6.30/linux-image-2.6.30-020630-generic_2.6.30-020630_amd64.deb
for each test using stress (sudo apt-get install stress):
stress --cpu 16 --vm 2 --vm-bytes 128M
Run this for a measured period of time say 15 minutes and then gather
the temperatures, I use sensors for this:
$ sensors
acpitz-virtual-0
Adapter: Virtual device
temp1: +46.0°C (crit = +100.0°C)
temp2: +43.0°C (crit = +100.0°C)
temp3: +0.0°C (crit = +100.0°C)
If you are able to identify your your fan speeds it would also be
helpful to include that information in your report. In all cases please
report your results in this bug. Thanks.
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Ubuntu 9.04 laptop overheat and shutdown
https://bugs.launchpad.net/bugs/370173
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