From mboxrd@z Thu Jan 1 00:00:00 1970 From: Per Jessen Date: Mon, 18 Feb 2008 15:20:21 +0000 Subject: Re: [lm-sensors] does lm-sensors pick up sensors that don't exist? Message-Id: List-Id: References: In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable To: lm-sensors@vger.kernel.org Jean Delvare wrote: > Depends on the thermal sensor type. For thermal diodes (or > diode-connected transistors) the chip can typically detect if the > thermal sensor is missing, and it will report it either explicitly in > a status register, or through an arbitrary value (typically -128 or > +127). >=20 > For thermistors, what the chip measures is actually a voltage, which > is then converted to a temperature value. If the board manufacturer > doesn't want to implement a sensor, they will typically wire the input > to the ground, which is equivalent to an infinitely high or infinitely > low temperature (depending on how the voltage divisor bridge is > built), and the chip doesn't have to treat this as a special case. > Things get bad when the manufacturer leave the thermal input floating, > you will get random temperatures. This is quite possibly what Per is > experiencing. Hi Jean if only I was getting random readings, but the readout I'm seeing doesn't look random at all - it's typically 80-81, but will increase to 86 when I'm stressing the system (the CPU-temp will rise to 62/63 at the same time). =20 I'm currently waiting for the board to be replaced, so I can't tell you exactly what lm-sensors says about the type of sensor, but I think it said it was "transistor".=20 Regardless, I guess I should be ignoring it when Gigabyte says it's not there ... /Per Jessen, Z=C3=BCrich _______________________________________________ lm-sensors mailing list lm-sensors@lm-sensors.org http://lists.lm-sensors.org/mailman/listinfo/lm-sensors