/proc/therm have unstable content
The content of /proc/therm sometimes changes without anyone running
set_therm to modify the HI and LOW values.
I can see this when cat'ing the content, and suddenly it will go from
Thermostat: HI 50.0, LOW 44.0; temperature: 43.5 C, fan on
to
Thermostat: HI 1.0, LOW 0.0; temperature: 43.5 C, fan on
Do anyone have any idea why this happens?
I'm running this small script to make sure the fan stops when the
temperature is below a given threshold. My fan gives a lot of noice,
so I want to turn it off as much as possible. This is the script:
#!/usr/bin/perl -w
#
# Author: Petter Reinholdtsen <pere@td.org.uit.no>
#
# Check Netwinder themperature, and turn on fan if it is to high.
my $debug = 0;
sub get_themp {
open(THEMP, "< /proc/therm") || die "Unable to open /proc/therm";
my $line = <THEMP>;
close(THEMP);
my ($hi, $lo, $therm) = $line =~
m/Thermostat: HI (\S+), LOW (\S+); temperature: (\S+) C, fan /;
return $hi, $lo, $therm;
}
while (1) {
my ($hi, $lo, $therm) = get_themp();
my $foo = $lo - (($hi - $lo) / 2.0);
print "Got $hi > $lo > $foo ? $therm\n" if $debug;
if ($therm <= $foo) {
print "Below or equal to $foo, stopping fan\n" if $debug;
`fan_ctrl off`;
} elsif ($therm > $hi) {
print "Above hi, starting fan\n" if $debug;
`fan_ctrl on`;
} elsif ($therm >= $lo) {
print "Above or equal to lo $lo, starting fan\n" if $debug;
`fan_ctrl start`;
}
sleep(5);
}
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