Messages in this thread | | | Date | Wed, 13 Aug 2008 16:43:38 -0400 | From | Theodore Tso <> | Subject | Re: 2.6.26: thinkpad x60 is cooled passively |
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On Wed, Aug 13, 2008 at 05:31:37PM -0300, Henrique de Moraes Holschuh wrote: > > know the fans have a tendency to go bad within 12-18 months, and so > > the CPU heat sink and fan unit needs to be replaced perdiocially. > > What does /proc/acpi/ibm/fan report? > > ThinkPad fans have a overdesign range of about 2x, they almost never stop > because they're too old. Clogged in dirt, on the other hand... a clogged > fan often spins FASTER and cools less. > > Want to see how much your fan has as far as a safety margin goes? use > thinkpad-acpi to measure RPMs in level 7 and also when you switch PWM off > (i.e. set it to 100% duty cycle). Mine gets faster by 1500RPM or so that > reflects the extra torque the EC can apply to get the fan to run at the > speed it wants it to.
Hmm, maybe I've just had bad luck, or I live in a very dusty environment (four cats, including two longhairs in perma-shed mode, will do that to any house), but I've had at least 3 fan failures in the past 5-6 years where the fan stopped entirely, and had to be replaced. When I took it out, it was quite dirty, but the way it spun why I tried moving the fan blades with my finger, it felt just like the failure modes I've had with standard power supply fans that have gone bad due to old age.
- Ted
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