We can start with probing for (PCI) I2C or SMBus adapters.
You do not need any special privileges for this.
Do you want to probe now? (YES/no): YES
Probing for PCI bus adapters...
Use driver `i2c-amd756' for device 00:07.3: AMD-756 Athlon ACPI
Probe succesfully concluded. 

We will now try to load each adapter module in turn.
Load `i2c-amd756' (say NO if built into your kernel)? (YES/no): YES
Module loaded succesfully. 

To continue, we need module `i2c-dev' to be loaded.
If it is built-in into your kernel, you can safely skip this.
i2c-dev is not loaded. Do you want to load it now? (YES/no): YES
Module loaded succesfully. 

We are now going to do the adapter probings. Some adapters may hang halfway
through; we can't really help that. Also, some chips will be double detected;
we choose the one with the highest confidence value in that case.
If you found that the adapter hung after probing a certain address, you can
specify that address to remain unprobed. That often
includes address 0x69 (clock chip).

Next adapter: SMBus AMD756 adapter at 50e0
Do you want to scan it? (YES/no/selectively): YES
Probing for `Winbond W83782D'... Success!
(confidence 8, driver `w83781d'), other addresses: 0x48 0x49
Probing for `SPD EEPROM'... Success!
Client found at address 0x51
Probing for `SPD EEPROM'... Success!
(confidence 8, driver `eeprom')
Client found at address 0x52
Probing for `SPD EEPROM'... Success!
(confidence 8, driver `eeprom')
Client found at address 0x69  

Some chips are also accessible through the ISA bus. ISA probes are
typically a bit more dangerous, as we have to write to I/O ports to do
this. This is usually safe though.

Do you want to scan the ISA bus? (YES/no): no
Some Super I/O chips may also contain sensors. Super I/O probes are
typically a bit more dangerous, as we have to write to I/O ports to do
this. This is usually safe though.
Do you want to scan for Super I/O sensors? (YES/no): no

Now follows a summary of the probes I have just done.
Just press ENTER to continue:

Driver `w83781d' (should be inserted):
Detects correctly:
* Bus `SMBus AMD756 adapter at 50e0'
Busdriver `i2c-amd756', I2C address 0x2d (and 0x48 0x49)
Chip `Winbond W83782D' (confidence: 8)
Driver `eeprom' (should be inserted):
Detects correctly:
* Bus `SMBus AMD756 adapter at 50e0'
Busdriver `i2c-amd756', I2C address 0x50
Chip `SPD EEPROM' (confidence: 8)
* Bus `SMBus AMD756 adapter at 50e0'
Busdriver `i2c-amd756', I2C address 0x51
Chip `SPD EEPROM' (confidence: 8)
* Bus `SMBus AMD756 adapter at 50e0'
Busdriver `i2c-amd756', I2C address 0x52
Chip `SPD EEPROM' (confidence: 8)  

I will now generate the commands needed to load the I2C modules.
If you want to load the modules at startup, generate a config file
below and make sure lm_sensors gets started at boot time; e.g
$ rc-update add lm_sensors default

To make the sensors modules behave correctly, add these lines to
/etc/modules.d/lm_sensors and run modules-update:

#----cut here----
# I2C module options
alias char-major-89 i2c-dev
#----end cut here----

WARNING! If you have some things built into your kernel, the list above
will contain too many modules. Skip the appropriate ones! You really should
try these commands right now to make sure everything is working properly.
Monitoring programs won't work until it's done.
To load everything that is needed, execute the commands below...

#----cut here----
# I2C adapter drivers
modprobe i2c-amd756
# I2C chip drivers
modprobe w83781d
modprobe eeprom
# sleep 2 # optional
/usr/bin/sensors -s # recommended
#----end cut here----

Do you want to generate /etc/conf.d/lm_sensors? Enter s to specify other file name?
(YES/no/s): YES
 

* Loading lm_sensors modules...
* Loading i2c-amd756... [ ok ]
* Loading w83781d... [ ok ]
* Loading eeprom... [ ok ]
* Initializing sensors... [ ok ] 

w83782d-i2c-0-2d
Adapter: SMBus AMD756 adapter at 50e0

VCore 1: +1.78 V (min = +1.66 V, max = +1.82 V)
VCore 2: +2.53 V (min = +1.66 V, max = +1.82 V) ALARM
+3.3V: +3.41 V (min = +3.14 V, max = +3.46 V)
+5V: +5.19 V (min = +4.73 V, max = +5.24 V)
+12V: +12.40 V (min = +10.82 V, max = +13.19 V)
-12V: -12.61 V (min = -13.18 V, max = -10.88 V)
-5V: -4.80 V (min = -5.25 V, max = -4.75 V) ALARM
V5SB: +5.38 V (min = +4.73 V, max = +5.24 V) ALARM
VBat: +3.12 V (min = +2.40 V, max = +3.60 V)
fan1: 0 RPM (min = 2657 RPM, div = 2)
fan2: 5037 RPM (min = 2657 RPM, div = 2)
fan3: 0 RPM (min = 664 RPM, div = 8)
temp1: +38 C (high = +0 C, hyst = -128 C) sensor = thermistor
temp2: +52.0 C (high = +90 C, hyst = +88 C) sensor = thermistor
temp3: -46.5 C (high = +80 C, hyst = +75 C) sensor = diode
vid: +1.750 V (VRM Version 9.0)
alarms:
beep_enable:
Sound alarm disabled
 

/usr/sbin/fancontrol & > /dev/null

emerge ksensors