[ltp] Weird CPU fan problem on T400, any help appreciated.
Mark Altern
linux-thinkpad@linux-thinkpad.org
Sat, 17 Jul 2010 19:01:15 -0500
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It's been less than a year. I opened it up and it's clean and fine.
On Sat, Jul 17, 2010 at 6:51 PM, Pedro Ribeiro <pedrib@gmail.com> wrote:
> On 17 July 2010 03:55, Mark Altern <mark.altern@gmail.com> wrote:
> > Before Ubuntu 10.04, I was using 9.10 and the cpu fancontrol is working
> OK,
> > without me installing any fancontrol software. I think the BIOS control
> it
> > through acpi. It works perfectly.
> >
> > Now after I did a clean install of 10.04, I found the BIOS doesn't do it
> > correctly: since the start-up cpu fan speed is about 1886rmp (normal),
> when
> > the cpu temp goes to 55c, it cramp up to 2700rmp, then after that even
> the
> > cpu have been idle for a long while and temp drop to 37c, the fan
> wouldn't
> > slow down, but keep running at that high speed.
> >
> > Then as suggested by a linux guru friend, I use a Window 7 install DVD to
> > boot the laptop without doing anything, and then reboot back to Ubuntu
> > 10.04, this time the CPU fan start working correctly, meaning the fan
> speed
> > goes up and goes down according to cpu temp. BUT, this lasts only for a
> > short while, and after running it for a hour, the CPU fan will run high
> > speed (2738rmp) without slowing down again, even the CPU temp drop to 36C
> > already.
> >
> > What possibly is wrong? please give me some guidance, guys.
> > Thanks a lot.
> >
> >
> > Lenovo Thinkpad T400,
> > p8600@2.4Ghz, DDR3@4G, 160G@7200RPM, Intel X4500.
>
> That's strange.. for how long do you have your T400? Maybe you need to
> open it and clean the fan.
>
> Regards,
> Pedro
> --
> The linux-thinkpad mailing list home page is at:
> http://mailman.linux-thinkpad.org/mailman/listinfo/linux-thinkpad
>
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It's been less than a year. I opened it up and it's clean and fine.=
<br><br><div class=3D"gmail_quote">On Sat, Jul 17, 2010 at 6:51 PM, Pedro =
Ribeiro <span dir=3D"ltr"><<a href=3D"mailto:pedrib@gmail.com">pedrib@gm=
ail.com</a>></span> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin: 0pt 0pt 0pt 0.8ex; borde=
r-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"><div><div></div><=
div class=3D"h5">On 17 July 2010 03:55, Mark Altern <<a href=3D"mailto:m=
ark.altern@gmail.com">mark.altern@gmail.com</a>> wrote:<br>
> Before Ubuntu 10.04, I was using 9.10 and the cpu fancontrol is workin=
g OK,<br>
> without me installing any fancontrol software. I think the BIOS contro=
l it<br>
> through acpi. It works perfectly.<br>
><br>
> Now after I did a clean install of 10.04, I found the BIOS doesn't=
do it<br>
> correctly: since the start-up cpu fan speed is about 1886rmp (normal),=
when<br>
> the cpu temp goes to 55c, it cramp up to 2700rmp, then after that even=
the<br>
> cpu have been idle for a long while and temp drop to 37c, the fan woul=
dn't<br>
> slow down, but keep running at that high speed.<br>
><br>
> Then as suggested by a linux guru friend, I use a Window 7 install DVD=
to<br>
> boot the laptop without doing anything, and then reboot back to Ubuntu=
<br>
> 10.04, this time the CPU fan start working correctly, meaning the fan =
speed<br>
> goes up and goes down according to cpu temp. BUT, this lasts only for =
a<br>
> short while, and after running it for a hour, the CPU fan will run hig=
h<br>
> speed (2738rmp) without slowing down again, even the CPU temp drop to =
36C<br>
> already.<br>
><br>
> What possibly is wrong? please give me some guidance, guys.<br>
> Thanks a lot.<br>
><br>
><br>
> Lenovo Thinkpad T400,<br>
> p8600@2.4Ghz, DDR3@4G, 160G@7200RPM, Intel X4500.<br>
<br>
</div></div>That's strange.. for how long do you have your T400? Maybe =
you need to<br>
open it and clean the fan.<br>
<div><div></div><div class=3D"h5"><br>
Regards,<br>
Pedro<br>
--<br>
The linux-thinkpad mailing list home page is at:<br>
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ux-thinkpad</a><br>
</div></div></blockquote></div><br>
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