pmbus driver for x86

Greg KH greg at
Mon Jan 12 10:31:19 EST 2015

On Mon, Jan 12, 2015 at 03:34:45PM +0900, J.Hwan Kim wrote:
> Hi,
> My server (S2600CP) has BMC module and power supply with pmbus function.
> When I try to control and monitor with pmbus driver in linux, it fails.
> I connected oscilloscope to pmbus connector (SCL, SDA) pins, there was 
> no signal from pmbus driver.
> But when the system went down, there are pmbus signals which may be 
> generated by BMC.
> In x86 server,  is pmbus connected only to BMC(ipmi)?
> Is it not connected to CPU i2c bus?
> is it impossible to monitor power supply with pmbus drvier?

Why not ask on the lm-sensors mailing list, where the kernel sensor
developers are, that wrote this code?  That would be the best place for

good luck,

greg k-h

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