[lm-sensors] ECS GeForce 6100 PM-M2 - labels/calculations

[lm-sensors] ECS GeForce 6100 PM-M2 - labels/calculations

[Ben Norwood]

My Motherboard is an ECS GeForce 6100 PM-M2, with a IT8726 I/O chip.
After extensive web searching, I haven't (yet!) discovered the 
appropriate labels or calculations for the readings given in sensors.
Vcore and VDIMM are based on readings from the BIOS, the 3.3V label 
seemed logical, the M/B temp is based on Systemp in BIOS, and Fake Temp 
is so called because it reads a constant 25°C - even when I'm torturing 
the CPU! Talking of temperatures, they do seem a little dodgy - is the 
CPU really 10°C cooler than room temp, and the motherboard 10°C hotter?
Oh, and I have a fan hooked up to the SYSFAN header (which gives an RPM 
reading if I plug it into the CPUFAN header), but it looks as though ECS 
haven't connected the RPM pin to the chip :(

If anyone can make head or tail of this lot I'd be grateful!

[ben@LinuxBox ~]$ sensors
k8temp-pci-00c3
Adapter: PCI adapter
Core0 Temp: +13.0°C
Core0 Temp: +3.0°C
Core1 Temp: +6.0°C
Core1 Temp: +2.0°C

acpitz-virtual-0
Adapter: Virtual device
temp1: +16.0°C (crit = +70.0°C)

it8716-isa-0290
Adapter: ISA adapter
Vcore?: +1.30 V (min = +0.00 V, max = +4.08 V)
in1: +2.48 V (min = +0.00 V, max = +4.08 V)
VDIMM?: +1.84 V (min = +0.00 V, max = +4.08 V)
+3.3V?: +3.31 V (min = +0.00 V, max = +4.08 V)
in4: +1.20 V (min = +0.00 V, max = +4.08 V)
in5: +1.15 V (min = +0.00 V, max = +4.08 V)
in6: +2.94 V (min = +0.00 V, max = +4.08 V)
in7: +3.06 V (min = +0.00 V, max = +4.08 V)
VBat: +3.01 V
fan1: 2360 RPM (min = 11 RPM)
fan2: 0 RPM (min = 0 RPM)
CPU temp: +16.0°C (low = -1.0°C, high = +127.0°C) sensor = thermal diode
M/B temp: +35.0°C (low = -1.0°C, high = +127.0°C) sensor = transistor
Fake temp: +25.0°C (low = -1.0°C, high = +127.0°C) sensor = transistor
cpu0_vid: +1.525 V


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Re: [lm-sensors] ECS GeForce 6100 PM-M2 - labels/calculations

[Charles]

Hello Ben  :-)

It's been a while and none of the experts have responded to you so I'll chip
in.

It is not unusual for motherboard designers to leave several I/O chip pins
unconnected so your hypotheses about "Fake" temp and SYSFAN RPM are probably
correct.

If your K8 CPU is revision F or G, the CPU core temperatures are not usable.
In AMD's "Revision Guide for AMD NPT Family 0Fh Processors" it says "The
internal thermal sensor ... is inaccurate".  This may be the reason for many
reports of k8temp giving absurdly low CPU core temperatures and for there
being no generally accepted computation to derive actual temperature from
the raw data.  The workaround is to ignore core temperatures and use the CPU
case temperature as was done before core temperatures were available.

If your K8 CPU is a later revision the core temperatures are usable but not
intuitive.  The temp for each CPU core is the average of its two sensor
circuits _plus an offset value_.  For details, including sample lm-sensors
configuration, see
http://forums.opensuse.org/archives/sls-archives/archives-suse-linux/archive
s-hardware-support/381563-lm-sensors-2.html#post1793098.

cpu0_vid is (was?) not dynamic under the current lm-sensors implementation;
the value shown is the value at start up.

Best

Charles

-----Original Message-----
Message: 1
Date: Mon, 16 Mar 2009 11:28:40 +0000
From: Ben Norwood <mittfh@googlemail.com>
Subject: [lm-sensors] ECS GeForce 6100 PM-M2 - labels/calculations
To: lm-sensors@lm-sensors.org
Message-ID: <49BE37E8.90301@googlemail.com>
Content-Type: text/plain; charset=UTF-8; format=flowed

My Motherboard is an ECS GeForce 6100 PM-M2, with a IT8726 I/O chip.
After extensive web searching, I haven't (yet!) discovered the 
appropriate labels or calculations for the readings given in sensors.
Vcore and VDIMM are based on readings from the BIOS, the 3.3V label 
seemed logical, the M/B temp is based on Systemp in BIOS, and Fake Temp 
is so called because it reads a constant 25?C - even when I'm torturing 
the CPU! Talking of temperatures, they do seem a little dodgy - is the 
CPU really 10?C cooler than room temp, and the motherboard 10?C hotter?
Oh, and I have a fan hooked up to the SYSFAN header (which gives an RPM 
reading if I plug it into the CPUFAN header), but it looks as though ECS 
haven't connected the RPM pin to the chip :(

If anyone can make head or tail of this lot I'd be grateful!

[ben@LinuxBox ~]$ sensors
k8temp-pci-00c3
Adapter: PCI adapter
Core0 Temp: +13.0?C
Core0 Temp: +3.0?C
Core1 Temp: +6.0?C
Core1 Temp: +2.0?C

acpitz-virtual-0
Adapter: Virtual device
temp1: +16.0?C (crit = +70.0?C)

it8716-isa-0290
Adapter: ISA adapter
Vcore?: +1.30 V (min = +0.00 V, max = +4.08 V)
in1: +2.48 V (min = +0.00 V, max = +4.08 V)
VDIMM?: +1.84 V (min = +0.00 V, max = +4.08 V)
+3.3V?: +3.31 V (min = +0.00 V, max = +4.08 V)
in4: +1.20 V (min = +0.00 V, max = +4.08 V)
in5: +1.15 V (min = +0.00 V, max = +4.08 V)
in6: +2.94 V (min = +0.00 V, max = +4.08 V)
in7: +3.06 V (min = +0.00 V, max = +4.08 V)
VBat: +3.01 V
fan1: 2360 RPM (min = 11 RPM)
fan2: 0 RPM (min = 0 RPM)
CPU temp: +16.0?C (low = -1.0?C, high = +127.0?C) sensor = thermal diode
M/B temp: +35.0?C (low = -1.0?C, high = +127.0?C) sensor = transistor
Fake temp: +25.0?C (low = -1.0?C, high = +127.0?C) sensor = transistor
cpu0_vid: +1.525 V


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Re: [lm-sensors] ECS GeForce 6100 PM-M2 - labels/calculations

[Jean Delvare]

On Thu, 19 Mar 2009 19:04:39 +0530, Charles wrote:
> cpu0_vid is (was?) not dynamic under the current lm-sensors implementation;
> the value shown is the value at start up.

Depends on the chip/driver. It's dynamic if read from regular registers
as other monitored values. It's the start up value if read from the
Super-I/O configuration space. The reason is that there is no
coordination between the various drivers which may access Super-I/O
configuration registers at the moment, so we don't want to access them
past initialization time. If we ever have proper locking protecting
Super-I/O register access then we can do dynamic readings on all
chips/drivers.

-- 
Jean Delvare

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Re: [lm-sensors] ECS GeForce 6100 PM-M2 - labels/calculations

[Jean Delvare]

Hi Charles,

On Thu, 19 Mar 2009 19:39:50 +0530, Charles wrote:
> Thanks for the info, Jean  :-)
> 
> You did intend to mail me rather than the list ... ?

No, I mailed you _and_ the list, as I usually do. You, on the other
hand, omitted the list, which I am adding back...

> Is there an easy way for someone who does not know where cpu0_vid comes from
> to find out if it is static or dynamic?

Unfortunately there is no other reliable way than reading the driver
code (or the datasheet). Some driver might say what type they belong to
in their documentation file, but I don't think they all do.

>  Ideally -- and perhaps in reality
> -- cpu0_vid is stable so the simple fact that it never changes cannot be
> used to determine if it is dynamic or not.  True?

With the advent of CPU frequency scaling, the VID value _does_ often
change: lower frequencies typically need a lower core voltage.

-- 
Jean Delvare

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