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I have a Raspberry Pi (3B+) in a setup, where during boot process may a small undervoltage occur (under certain conditions). However, I found out, that it never leaves the "throttled" state after.

dmesg shows usually one set of lines like

[   99.990070] Under-voltage detected! (0x00050005)
[  108.309618] Voltage normalised (0x00000000)

However, the throttled flag throttled=0x50000 remains there. I tested the voltage on both 5V pins and 3.3V pins with a good voltmeter and then even oscilloscope and the voltage is perfect and steady without oscillations .

Is there any way how to tell it "You are good" besides rebooting which is not an option for me?

Jan Koupil
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  • In the flag, throttled=0x50000, the word throttled is past tense. In other words, throttled=0x50000 means the undervoltage event has come and gone - the event that triggered the dmesg entry no longer exists. – Seamus Oct 21 '22 at 08:42
  • As per the link in Milliway's post, if the system were currently in the throttled-because-of-undervoltage state, the flag would include 0x5 (as it does in the dmesg log from when it happened). – goldilocks Oct 21 '22 at 11:51

1 Answers1

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throttled=0x50000 means:-

Under-voltage has occurred
Throttling has occurred

See https://www.raspberrypi.com/documentation/computers/os.html#vcgencmd

AFAIK there is no way to reset it as it is reporting an historic event.

Just ignore it (but the real solution is to fix the PSU)

This is NOT "a small undervoltage" - the voltage is < 4.63±0.07V which is way below the recommended minimum.
See Raspberry Pi Power Limitations

Milliways
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  • So, if a software like OctoPI claims that the system is throttled based on throttled!=0x0 record, and wont work/update/whatever even though everything is OK (for hours, there is only the throttled=0x50000, it is a problem of that software, not the PI.

    Thank you.

     – Jan Koupil Oct 21 '22 at 09:29