Buggy DSDT on Dell Latitude E5400

Buggy DSDT on Dell Latitude E5400

[Sébastien Hinderer]

Dear all,

On a recently bought Dell Latitude E5400 laptop with Debian unstable
installed, the fan is constantly working.
This happens although the temperature reported by acpi -v is around 30
degrees Celcius, and although top reports a CPU usage around 1%.

Moreover, when the installed Windows XP is started and the machine is
left untouched, the fan remains turned off all the time.

Are these symptoms the consequence of a buggy DSDT which Windows
overrides ? 
In that case, how can the problem be fixed ?
Is it necessary to disassemble and study the DSDT, or is it possible to
somehow fetch the working one presumably used by Windows XP ?

Any help / suggestion warmly appreciated.
Kind regards,
Sebastien.

Re: Buggy DSDT on Dell Latitude E5400

[Zhang Rui]

Hi, sebatien,

please file a bug report at bugzilla.kernel.org
and attach the output of acpidump there.
BTW: you can get the acpidump using the latest
pmtools at:
http://www.lesswatts.org/projects/acpi/utilities.php

thanks,
rui

On Sun, 2008-12-14 at 10:21 +0800, Sébastien Hinderer wrote:
> Dear all,
> 
> On a recently bought Dell Latitude E5400 laptop with Debian unstable
> installed, the fan is constantly working.
> This happens although the temperature reported by acpi -v is around 30
> degrees Celcius, and although top reports a CPU usage around 1%.
> 
> Moreover, when the installed Windows XP is started and the machine is
> left untouched, the fan remains turned off all the time.
> 
> Are these symptoms the consequence of a buggy DSDT which Windows
> overrides ? 
> In that case, how can the problem be fixed ?
> Is it necessary to disassemble and study the DSDT, or is it possible to
> somehow fetch the working one presumably used by Windows XP ?
> 
> Any help / suggestion warmly appreciated.
> Kind regards,
> Sebastien.
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Re: Buggy DSDT on Dell Latitude E5400

[Sébastien Hinderer]

Dear Rui, dear all,

> please file a bug report at bugzilla.kernel.org
> and attach the output of acpidump there.

Done, it's bug #12231.
Many thanks for your help,
Sébastien.
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Re: Buggy DSDT on Dell Latitude E5400

[Sébastien Hinderer]

Dear all,

As required on list, the problem has been reported at:
http://bugzilla.kernel.org/show_bug.cgi?id=12231
Is there any additional information that could help people in solving
this problem ?
Many thanks in advance,
Sébastien.
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