Hi Carson, On Sat, 13 Oct 2012 21:16:17 +1100, Carson Au wrote: > I am having trouble accessing the SMBus on PCI Express slots using > lm-sensors or i2c-tools. I have attached my oscilloscope probes to the CLK > and DATA lines, but even when I run sensors-detect, I can see no such > activity on the line (lm-sensors does indeed find some i2c sensors). I'd suggest using i2cdetect rather than sensors-detect for the job. sensors-detect doesn't probe all addresses and skips some I2C adapters by default. > I am wondering if SMBus is even implemented on my Asrock Extreme 4 > motherboard (is it a mandatory requirement or just optional?). I think it is mandatory, but even if it is the case you can't force hardware manufacturers to follow the specification. > Or maybe the SMBus connected to PCIe slots are behind an SMBus > multiplexer? This is a possibility, yes. Do you see all DIMM SPD EEPROMs? If not the SMBus is certainly multiplexed. On some boards there's a separate SMBus header. If your board has one, you could try that. -- Jean Delvare _______________________________________________ lm-sensors mailing list lm-sensors@xxxxxxxxxxxxxx http://lists.lm-sensors.org/mailman/listinfo/lm-sensors
