mirror of
https://github.com/lm-sensors/lm-sensors.git
synced 2026-10-29 12:50:43 +00:00
Mark D. Studebaker
d44f0d6d15
git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@1091 7894878c-1315-0410-8ee3-d5d059ff63e0
48 lines
1.4 KiB
Plaintext
48 lines
1.4 KiB
Plaintext
If you aren't getting the expected readings on your fans,
|
|
try the following:
|
|
|
|
- Do you get a fan reading in the BIOS or in DOS?
|
|
If not, you may not have a fan with a tachometer output.
|
|
Look and see. Fans with tachometer outputs have THREE wires.
|
|
|
|
- Try experimenting with the fan divisor settings:
|
|
|
|
|
|
Fan Divisor Minimum RPM Maximum RPM
|
|
|
|
1 5314 1350000
|
|
2 2657 675000
|
|
4 1328 337500
|
|
8 664 168750
|
|
16 332 84375
|
|
32 166 42187
|
|
64 83 21093
|
|
128 41 10546
|
|
|
|
|
|
Pick a divisor so that the nominal RPM is about 50%
|
|
above the minimum. This is a good compromise between
|
|
margin and accuracy. Note that most chips only support
|
|
fan divisors of 1, 2, 4, and 8.
|
|
|
|
If you have a 0 RPM reading some or all of the time,
|
|
increase the divisor until you get good readings.
|
|
|
|
If you have a nominal reading less than 1.25 times the
|
|
minimum, increase the divisor to give you margin
|
|
so that you will not get spurious alarms.
|
|
|
|
If you have a nominal reading more than 3 times the
|
|
minimum, decrease the divisor to provide better
|
|
accuracy.
|
|
|
|
- How to change fan divisors:
|
|
|
|
Method 1: "echo x y z > /proc/sys/dev/sensors/...../fan_div"
|
|
where 'x y z' are the fan divisors for the three fans and '...'
|
|
is the sensor in question.
|
|
|
|
Method 2: Put an entry "set fanx_div y" in the appropriate section
|
|
of /etc/sensors.conf and rerun 'sensors -s'.
|
|
(x is the number of the fan 1-3 and y is the divisor).
|