[lm-sensors] Problems with SMSC EMC2103-2

Guenter Roeck guenter.roeck at ericsson.com
Thu May 31 20:00:45 CEST 2012

On Wed, 2012-05-30 at 14:41 -0400, Sebl wrote:
> Yes I'm 100% certain because I can read the top marking. It says: SMSC
> EMC2103. So there is no! doubt. But I can send you pictures, if you want.
> Hardwaremonitoring (Vcore, fan, ...) is possible with windows, so there
> should be the possibility to monitor it with linux, too.
> I can send you lspci later, but as far as I remember it only listed the
> intel chipset drivers.
> hp_wmi and hp_accel modules are automatically loaded @ startup.
Please don't top-post.

Maybe you have the EMC2103 on your board, connected to one of its I2C
But it is not the chip detected on the LPC bus.


> -----Ursprüngliche Nachricht-----
> Von: Jean Delvare [mailto:khali at linux-fr.org]
> Gesendet: Montag, 28. Mai 2012 09:02
> An: sebl at storm-clan.de
> Cc: lm-sensors at lm-sensors.org; Steve Glendinning; Juerg Haefliger
> Betreff: Re: [lm-sensors] Problems with SMSC EMC2103-2
> On Sun, 27 May 2012 23:39:23 +0200, sebl at storm-clan.de wrote:
> > Hi,
> > 
> > somehow lm-sensors does not seem to recognize the EMC2103-2 chip in my 
> > notebook (HP 2530p). When i run sensors-detect it says:
> > 
> > #Do you want to scan for Super I/O sensors? (YES/no): y #Probing for 
> > Super-I/O at 0x2e/0x2f #Trying family `National Semiconductor/ITE'...
> > No !#Trying family `SMSC'... Yes !#Found unknown chip with ID 0x4501 
> > #Probing for Super-I/O at 0x4e/0x4f #Trying family `National 
> > Semiconductor/ITE'... No #Trying family `SMSC'... No #Trying family 
> > `VIA/Winbond/Nuvoton/Fintek'... No #Trying family `ITE'... No
> > 
> > "Found unknown chip with ID 0x4501" But I'm 100% certain that it is 
> > the
> > EMC2103-2 chip which is described as support in the documentation.
> How are you 100% certain? Did you read the top marking of the chip?
> Me, I am 100% certain that the above is NOT an EMC2103-2, because it is
> connected to the LPC bus while the EMC2103-2 is an SMBus chip. Can't be the
> same chip.
> The chip above is likely to be a HP-specific Super-I/O chip, maybe Juerg
> (Cc'd) can identify it. There is no guarantee that it includes hardware
> monitoring features though.
> > I can
> > load the driver with modprobe emc2103, but nothing happens.
> This is expected for all SMBus-based drivers, devices can appear afterward
> so drivers never refuse to load.
> > lm-sensors
> > only detects the temperature-sensors correctly, not the fan speed or 
> > anything else. Are there known problems with this chip? Or is somenone 
> > successfully running lm-sensors with EMC2103-2?
> Driver was contributed by SMSC themselves (Steve Cc'd), I'm fairly certain
> that they tested their code.
> What could happen is that the SMBus controller to which the EMC2103-2 chip
> is connected, is not properly supported on your system. Maybe it is a very
> recent chip we don't support yet, or maybe ACPI gets in the way and prevents
> the driver from binding to the chip. I'd like to see the complete output of
> sensors-detect and lspci.
> Note BTW that it is very frequent for laptops to not include complete
> hardware monitoring chips. Furthermore, the monitoring chip is usually
> hidden behind ACPI so all you get is the limited ACPI thermal zone
> interface, or some proprietary interface. You may want to give a try to the
> hp_accel and hp-wmi modules for laptop-specific features support.
> --
> Jean Delvare
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