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kfishy

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  1. So I've done some more tests and it seems on mainline the OPi Zero is stuck at around 480MHz constantly. However on 3.4 it supposedly idles around 240MHz according to CPUFreq so it really shouldn't be heating up to this extent.
  2. I realize it's not the coolest chip ever made but what I don't get is why the temperature is substantially lower under mainline (by at least 10C). I'd get well over 60C when idling under 3.4 but only 50C under mainline.
  3. No idea, cpufrequtils don't even work properly on mainline so I can't even tell if DVFS is on or not.
  4. So I've measured the VDD_CPUX rail when idle and I got 1.1V, which is the lowest the "dumb" regulator on the Zero can go. Honestly I'm at a loss as to why it's putting out almost as much heat at 240MHz as at 1200MHz.
  5. I've recently received my OrangePi Zero v1.4 and have experienced the same heat issue. After some experimentation I noticed that while the chip idles really, really hot (65C or so even with heatsink and thermal paste) when under load it barely budges (rises to about 75-80C a delta of 10-15C), this suggests that the DVFS may be broken on the new board revision. Maybe with the regulator changes it has affected how you set the resistor network? Just a wild guess. BTW on mainline kernel it idles around a reasonable 45C or so at room temp.
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