Hi, I'm facing the same problem. I did some research on my machine. On Fri, 2020-07-03 at 10:10 -0700, Guenter Roeck wrote: > There is nothing much if anything we can do about that. The NCT6798D > datasheet reports temperature source 28 as reserved. You could ask > Asus for support, but their usual response is that they don't support > Linux. Looks like there are different versions of the datasheet. The one of NCT6796D, Revision 0.6 states that 28 (0x1c or 11100) is "Select PECI Agent 0 Calibration as CPUFAN monitoring source." This seems to be correct since the fan in question is the CPU one and the value of "PECI Agent 0 Calibration" is actually very similar to the CPU temperature and rises with CPU load. Also, looking at the driver code I found no signs of reading so-called "HM Read-Only Registers". They are described in section 9.481 of the above datasheet. They are I/O ports (readable with `inb`) with their base address located in configuration registers 0x64 and 0x65 of the SuperIO. Some temperatures seem to be directly readable only through these registers. Looks like the driver monitors all temperatures only indirectly via switchable channels, is it true? Regards, Alexey
