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 am wondering if SMBus is even implemented on my Asrock Extreme 4 motherboard (is it a mandatory requirement or just optional?). Or maybe the SMBus connected to PCIe slots are behind an SMBus multiplexer?
Thanks,
Carson
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