Re: [SLE] Cautionary Tales: lm_sensors for beginners
- From: Stephen Boddy <stephen.boddy@xxxxxxxxxxxxxx>
- Date: Sat, 9 Sep 2006 12:46:55 +0100
On Saturday 09 September 2006 07:08, Basil Chupin wrote:
For the first time since starting to use Linux, I decided that I will go
really high tech and start using lm_sensors on SUSE 10.1.
I used the /usr/sbin/sensors- detect command and let it find them and
then "do its thing" to create the lm_sensors configuration file. Because
it was time for me to go biddie-byes I didn't reboot but shut the system
down and went to bed.
This morning I booted-up the system and suddenly I was hit by a very
high pitched sound coming from the computer. Ear-splitting it was :-(
and to me this is a no-no 'cause I suffer from tinnitus.
Took a while to pinpoint the sound as coming from the rheostat on the
(front) panel which controls the speed of the Gigabyte CPU heatsink fan.
There was not a murmur when I booted into the "other" OS so it was
something in SUSE. Finally[0] dawned on me that the only thing that
changed between "no noise" and "hight-pitched noise" was the creation of
the lm_sensors file in /etc/sysconfig. I renamed lm_sensors file,
rebooted and the sound vanished.
So, if you configure lm_sensors and suddenly find that there is a very
high-pitched sound coming from the innards of your computer case then
you now know what you can try and do to get rid of it.
[0] I have another rheostat on another (front) panel which controls the
speed of the PSU and case fans which occasionally makes a similar noise
if the speed of the case fans drops too low, and just gently tapping the
control knob gets rid of the noise. My initial reaction to the above was
that it was this that was causing the high-pitched sound.
This may sound like an silly question, but is it possible it's an alarm?
I've always found the lm_sensors stuff a bit hit and miss for detecting and
setting things properly, like putting odd values in for alarm conditions.
Not understanding the detail of how it works, it may be seeing something it
doesn't like and generating an audible alarm.
w83697hf-isa-0290
Adapter: ISA adapter
VCore: +1.66 V (min = +1.71 V, max = +1.89 V) ALARM
+3.3V: +1.49 V (min = +3.14 V, max = +3.47 V) ALARM
+5V: +4.87 V (min = +4.76 V, max = +5.24 V)
+12V: +12.04 V (min = +10.82 V, max = +13.19 V)
-12V: +1.54 V (min = -13.18 V, max = -10.80 V) ALARM
-5V: +0.13 V (min = -5.25 V, max = -4.75 V) ALARM
V5SB: +5.46 V (min = +4.76 V, max = +5.24 V) ALARM
VBat: +3.15 V (min = +2.40 V, max = +3.60 V)
fan1: 2766 RPM (min = 84375 RPM, div = 8) ALARM
fan2: 0 RPM (min = 1739 RPM, div = 8) ALARM
temp1: +38 C (high = +34 C, hyst = -92 C) sensor = thermistor
ALARM
temp2: +46.5 C (high = +100 C, hyst = +95 C) sensor = thermistor
alarms:
beep_enable:
Sound alarm enabled
As you can see, after a quick detect and init, I've got crazy values in some
fields, and alarms up the kazoo. Note also the beep_enable at the end. I
guess if that was wired up properly I'd be being annoyed right now by a high
pitched noise ;-)
--
Steve Boddy
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