Comment 280 for bug 370173

Revision history for this message
Diego Schulz (dschulzg) wrote : Re: [Bug 370173] Re: Ubuntu 9.04 laptop overheat and shutdown

On Wed, Aug 12, 2009 at 10:42 AM, elp<email address hidden> wrote:
> Let's say this isn't my official opinion ;) but as far as I can see the
> bug disappeared after upgrading windows manager to KDE 4.3 (previously
> using 4.2). Maybe Andy won't have to do anything at all...
>

Unfortunately that's simply not true. I'm also running KDE 4.3, and
with little effort I can reproduce the problem:

$ sha1sum /dev/urandom

let it running for at least 2 minutes before hitting CTRL+C.
IMHO this has nothing to do with the userland programs (that includes
desktop environments) but the kernel.
The problem persists even running in single user mode.

Recently I tried with a 2.6.27 kernel
[http://kernel.ubuntu.com/~kernel-ppa/mainline/v2.6.27.29/]
and the behavior was exactly the same.

As I mentioned earlier in other threads, the only workaround that
works for me es to suspend to ram and then restore. After that, the
problem vanishes and the fan just works.

I also tried adjusting the trip points in different ways. Trying to
adjust in a running kernel was not possible.
For me, the only effective way to adjust trip points was as kernel
parameters (eg. thermal.psv=60 thermal.act=45 in the kernel line in
/boot/grub/menu.lst).
But adjusting trip point didn't do any effect.