I'm afraid if you're getting undervolt warnings that's almost certainly
the cause of any serious issues like kernel hangs. The lightning bolt
not being visible simply means that the undervolt condition is not
sustained, but nevertheless any such warnings indicate that your power
supply is dropping below 4.7V (usually under load). Before investigating
this further, we'd need to eliminate that as a potential cause.
** Changed in: linux (Ubuntu)
Status: Confirmed => Incomplete
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https://bugs.launchpad.net/bugs/1889637
Title:
Raspberry Pi 3B hangs - dev_pm_opp_set_rate: failed to find current
OPP, Failed to get throttled, Failed to change plib frequency; mmc
timeout waiting for hardware interrupt
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