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by ndrw
Sun Jun 30, 2019 5:31 pm
Forum: Troubleshooting
Topic: Raspberry Pi 4 temperature
Replies: 529
Views: 131079

Re: Raspberry Pi 4 temperature

If you mean "over_voltage=-2" That seems to be working now. Can you clarify that? Were there any recent fixes? I tried that yesterday with everything up to date. Both -1 and -2 values resulted in ~1.1V supply voltage (looks like a maximum voltage the regulator can output). Needless to say, temperat...
by ndrw
Sun Jun 30, 2019 1:27 pm
Forum: Troubleshooting
Topic: Raspberry Pi 4 temperature
Replies: 529
Views: 131079

Re: Raspberry Pi 4 temperature

jamesh, Thank you for the info. This would be consistent with what I am seeing - lowering idle cpu frequencies has almost no impact on power consumption but changing (increasing) supply voltage increases power consumption dramatically. I will wait for the updated vli firmware, any eta would be great...
by ndrw
Fri Jun 28, 2019 7:57 am
Forum: Troubleshooting
Topic: Raspberry Pi 4 temperature
Replies: 529
Views: 131079

Re: Raspberry Pi 4 temperature

It is the newest version of Raspbian. Installed from image 2 days ago, an upgrade produced no meaningful changes. I've lowered arm_freq_min and core_freq_min so the idling frequencies are lower (without reducing the supply voltage) - strangely, there is no difference to the temperatures, or a very m...
by ndrw
Thu Jun 27, 2019 11:49 pm
Forum: Troubleshooting
Topic: Raspberry Pi 4 temperature
Replies: 529
Views: 131079

Re: Raspberry Pi 4 temperature

Nope, values in the range of [-16,-1] result in supply voltage of ~1.1V. Positive values (I tried only "1") work as expected. Looks like this config value has changed in RPi4.
by ndrw
Thu Jun 27, 2019 10:12 pm
Forum: Troubleshooting
Topic: Raspberry Pi 4 temperature
Replies: 529
Views: 131079

Re: Raspberry Pi 4 temperature

How to undervolt the SoC and reduce clock frequencies?
by ndrw
Wed Jun 26, 2019 11:47 pm
Forum: Troubleshooting
Topic: Raspberry Pi 4 temperature
Replies: 529
Views: 131079

Re: Raspberry Pi 4 temperature

With the case cover on and usb3 memory stick plugged in, it idles at >75C. Any activity pushes the temperature over 80C and the SoC starts throttling, which is very noticeable, e.g. when scrolling a page in a web browser. Without the case cover and usb3 stick, idle temperatures are around 10C lower,...

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