The active range for the PWM values for an Athlon64 3200+ CPU fan is
<= 16, above that it's full speed. The gnuplot data from pwmconfig:
255 3125
...
30 3125
28 3068
26 3068
24 3068
22 3068
20 3068
18 3068
16 3068
14 3013
12 2960
10 2909
8 2909
6 2721
4 2518
2 2163
0 0
The BIOS defaults to 8, 12, and 80 for 3 different speed settings (none
quiet).
pwmconfig fails to find the useful range because the step size during
its tests is far too big, therefore apply the patch below.
I don't think fancontrol can really handle this either, the temp/speed
curve is far too steep. It assumes the active range goes up to 255. I'll
work on it later.
Now what would be really handy is some integrated
monitor/alarm/fancontrol/logging daemon...
Volker
--- /usr/sbin/pwmconfig.orig 2005-09-13 12:34:49.000000000 +1200
+++ /usr/sbin/pwmconfig 2005-12-20 23:47:34.000000000 +1300
@@ -188,7 +188,9 @@
PLOTTER=gnuplot
STEP=15
-PDELAY=2
+STEP2=2
+STEP2_BELOW=31
+PDELAY=3
function pwmdetail()
{
@@ -256,6 +258,7 @@
fi
break
fi
+ test $pwm -lt $STEP2_BELOW && let STEP=$STEP2
let pwm=$pwm-$STEP
done
pwmdisable $P
--
Volker Kuhlmann is possibly list0570 with the domain in header
http://volker.dnsalias.net/ Please do not CC list postings to me.
