[ltp] fan stuck on high - temps appear fine

[John Li]

Hi all,

My X200's fan is usually inaudible (even with the hard drive spun
down), but on Linux after some time (perhaps after something CPU
intensive) the fan will spin faster and not slow down. With Vista, the
fan occasionally gets to approximately the same noise level when doing
something CPU intensive, but scales back down.


$ uname -r -m
2.6.27.4 x86_64

$ cat /proc/acpi/ibm/driver
driver:                         ThinkPad ACPI Extras
version:                        0.21

$ cat /proc/acpi/ibm/thermal
temperatures: 31 41 -128 31 26 -128 24 -128 40 35 -128 -128 -128 -128 -128 -128

$ cat /proc/acpi/ibm/fan
status:         enabled
speed:          3361
level:          auto


I've kept some records of temperatures. I saw the following values
while the fan was spinning slowly:

temperatures: 37 42 -128 36 33 -128 31 -128 43 42 -128 -128 -128 -128 -128 -128
temperatures: 41 43 -128 41 32 -128 29 -128 44 44 -128 -128 -128 -128 -128 -128
temperatures: 37 41 -128 37 32 -128 30 -128 43 43 -128 -128 -128 -128 -128 -128

Compared with my current temperature readings (which are lower than
each of these), there must be a bug somewhere, right?


Thanks,
jli