[lm-sensors] W83792D & Overtemperature LED on Supermicro

[mds@mds.gotdns.com (Mark Studebaker)]

you want hyst (hysteresis) to be high, like 68.
The alarm isn't cleared until the temperature goes below the hysteresis value.


Eric J. Bowersox wrote:
> (Sorry about the blank message, let's try it again...)
> 
> Greetings to all.
> 
> We've got some compute nodes here that are using Supermicro X6DHR
> motherboards (for the Intel Nocona processors), which use the Winbond
> W83792D hardware monitor chip.  Since the OS installed on these is SuSE
> Linux Enterprise Server 9 (kernel 2.6.5), I had to upgrade lm_sensors to
> 2.9.1 and apply a kernel patch (the one recently posted to this list) to
> get the right chip driver into the system.  I'm able to get temperature,
> fan, and voltage readings out of the chip, so it's all good there.
> 
> However, another strange issue has cropped up: during the system boot
> process, as soon as the "sensors" service loads, the "overtemperature"
> LED on the front panel begins flashing.  I've tried mucking around with
> the "set tempN_over" and "set tempN_hyst" lines in sensors.conf, but to
> no avail; the last settings I tried were 70 for over and 30 for hyst,
> and the light still blinks.  Naturally, if we ship the nodes like this,
> the customer might get worried, seeing all those blinking red lights.
> 
> So, anybody have any ideas, short of taking a pair of diagonal cutters
> to the leads for the temperature light?  Is that light somehow connected
> to one of the outputs of the W83792D, and if so, is there some kind of
> "magic poke" I can make to the chip registers to get it to quit
> flashing?  (Maybe this is a driver issue?)  Or have I just not been
> aggressive enough in how I changed the temperature bounds in
> sensors.conf?
> 
> Thanks in advance.
>