Re: [lm-sensors] Intel Core voltage monitoring

[Jean Delvare <khali@linux-fr.org>]

Hi Peter,

On Sun, 09 Dec 2007 13:06:29 +0100, Peter Ganzhorn wrote:
> BTW: I have a Toshiba Tecra A9 notebook on which lm_sensors can't 
> identify the hardware monitoring chips:
> 
> Some chips are also accessible through the ISA I/O ports. We have to
> write to arbitrary I/O ports to probe them. This is usually safe though.
> Yes, you do have ISA I/O ports even if you do not have any ISA slots!
> Do you want to scan the ISA I/O ports? (YES/no):
> Probing for `National Semiconductor LM78' at 0x290...       No
> Probing for `National Semiconductor LM78-J' at 0x290...     No
> Probing for `National Semiconductor LM79' at 0x290...       No
> Probing for `Winbond W83781D' at 0x290...                   No
> Probing for `Winbond W83782D' at 0x290...                   No
> Probing for `Silicon Integrated Systems SIS5595'...         No
> Probing for `VIA VT82C686 Integrated Sensors'...            No
> Probing for `VIA VT8231 Integrated Sensors'...              No
> Probing for `IPMI BMC KCS' at 0xca0...                      No
> Probing for `IPMI BMC SMIC' at 0xca8...                     No
> 
> Some Super I/O chips may also contain sensors. We have to write to
> standard I/O ports to probe them. This is usually safe.
> Do you want to scan for Super I/O sensors? (YES/no):
> Probing for Super-I/O at 0x2e/0x2f
> Trying family `National Semiconductor'...                   No
> Trying family `SMSC'...                                     Yes
> Found unknown non-standard chip with ID 0x7a
> Probing for Super-I/O at 0x4e/0x4f
> Trying family `National Semiconductor'...                   No
> Trying family `SMSC'...                                     Yes
> Found unknown chip with ID 0x0b00
> 
> Some CPUs or memory controllers may also contain embedded sensors.
> Do you want to scan for them? (YES/no):
> AMD K8 thermal sensors...                                   No
> Intel Core family thermal sensor...                         Success!
>     (driver `coretemp')
> Intel AMB FB-DIMM thermal sensor...                         No
> 
> 
> coretemp works just fine, but I have no way of monitoring anything else 
> which is quite unsatisfying to me...
> Maybe you guys can help me monitoring at least vcore!

Your sensors-detect output doesn't include the SMBus scan, I guess that
the SMBus is hidden. I've seen this before on Toshiba laptops, and
after investigation we found that the SMBus was being accessed by SMM
code, so it's not safe to let Linux access it. That's a design decision
by the manufacturer, there's nothing we can do. You might be able to
get the fan reading using the toshiba_acpi driver, but that's about it.

-- 
Jean Delvare

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