[lm-sensors] asus_atk0110 mis-behavior on ASUS p6t

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My system: ASUS p6t core i7 920, with ArchLinux, kernel 2.6.31.

Right after I start the computer the CPU diode temp is reported as about 36C, and CPU fan is running at about 500rpm, which is normal. But after a few minutes, the CPU diode temp become misleading, reported as 47C and the CPU fan is running 1100rpm, I am pretty sure the 47C Tj temp of CPU is wrong, because the Core temps of my i7 920 is well below 42. (Tj temp of Cpu is generally lower than core temp by 5C).  This happens only a few minutes  after startup.

After a few experiments, I find out, blacklisting asus_atk0110 solves this problem. I loaded w83667hg through lm_sensors, which report right CPU temp, around 36C consistantly and the CPU fan is NOT spinning loudly at 1100 rpm anymore, but stay around 500-600rpm. This is the correctly behavior because the fan and temp output is consistant with the ones I got from my dual boot windows 7, where I am sure the reading is correct.

So my question is why does asus_atk0110 provides wrong CPU temp and force the fan speed up? Is this a bug?
Why do people still prefer asus_atk0110 driver than the old ones?

Thanks a lot.
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