[Bug 380303] Re: thinkpad-acpi X200 Thinkpad fan fails to spin down .

[iponeverything]

I am seeing this issue on an x200s with 9.10 32 bit and a x200 with
10.04 64 bit

Fan seems to stays at around 3800 RPM regardless of temperature. Idle my
cpu is 33 C and a kernel build with -j 4 will push it over 61 C with no
change in fan speed.  I can use "echo level x > /proc/acpi/ibm/fan" to
adjust the fan speed manually -- but after a couple of minutes -- it
reverts to auto on its own. I don't have windows on either of machines,
so I don't know what the behavior of Embedded Controller is under
windows.

x200 with 10.04:
Linux mac 2.6.32-23-generic #37-Ubuntu SMP Fri Jun 11 08:03:28 UTC 2010 x86_64 GNU/Linux

running thinkfan, I can see that it is using the second value in
/proc/acpi/ibm/thermal which is HDAPS according to
http://www.vminko.org/gentoo_on_x200#acpi.  thinkpad_acpi.c appears to
show that it has not been modified since 2007.

from thinkpad_acpi.c

/*
 *  Changelog:
 *  2007-10-20          changelog trimmed down

Though I am assuming that when level=auto, fan speed is handled though
the Embedded Controller and has little interaction with thinkpad_acpi --
but assuming ECP works correctly under windows, the problem would seem
to point to issue with the kernel's interaction with ECP.

Has anyone updated the ECP to  1.06 (7XHT24WW) on the x200 to see if it
fixes the fan issue?

Anyway, just though I would add my 2 cents.

-- 
thinkpad-acpi X200 Thinkpad fan fails to spin down .
https://bugs.launchpad.net/bugs/380303
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