Getting Under-voltage warnings when /etc/cron.daily runs

[picameratk]

Top of syslog:

Apr 5 03:25:37 motionpi3 liblogging-stdlog: [origin software="rsyslogd" swVersion="8.24.0" x-pid="355" x-info="http://www.rsysl$
Apr 5 03:27:29 motionpi3 kernel: [44909.410295] Under-voltage detected! (0x00050005)
Apr 5 03:27:35 motionpi3 kernel: [44915.650294] Voltage normalised (0x00000000)
Apr 5 03:29:29 motionpi3 kernel: [45030.060770] Under-voltage detected! (0x00050005)
Apr 5 03:29:33 motionpi3 kernel: [45034.210692] Voltage normalised (0x00000000)
Apr 5 03:30:01 motionpi3 CRON[15736]: (root) CMD ( PATH="$PATH:/usr/local/bin/" pihole updatechecker local)
Apr 5 03:39:01 motionpi3 CRON[15794]: (root) CMD ( [ -x /usr/lib/php/sessionclean ] && if [ ! -d /run/systemd/system ]; then /u$
Apr 5 03:39:01 motionpi3 CRON[15796]: (root) CMD ( [ -x /usr/lib/php5/sessionclean ] && /usr/lib/php5/sessionclean)
Apr 5 03:39:06 motionpi3 systemd[1]: Starting Clean php session files...
Apr 5 03:39:06 motionpi3 systemd[1]: Started Clean php session files.
Apr 5 03:40:01 motionpi3 CRON[15880]: (root) CMD ( PATH="$PATH:/usr/local/bin/" pihole updatechecker local)
Apr 5 03:50:01 motionpi3 CRON[15939]: (root) CMD ( PATH="$PATH:/usr/local/bin/" pihole updatechecker local)
Apr 5 03:57:28 motionpi3 kernel: [46708.615260] Under-voltage detected! (0x00050005)
Apr 5 03:57:34 motionpi3 kernel: [46714.855234] Voltage normalised (0x00000000)

At no other time daily do I get Under-voltage messages.

/etc/crontab:

SHELL=/bin/sh
PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin
m h dom mon dow user command
17 * * * * root cd / && run-parts --report /etc/cron.hourly
25 3 * * * root cd / && run-parts --report /etc/cron.daily
47 4 * * 7 root cd / && run-parts --report /etc/cron.weekly
52 4 1 * * root cd / && run-parts --report /etc/cron.monthly
47 1 * * 7 root ionice -c 3 fstrim -v /

Other notes:

Raspberry Pi 3 with Raspian Stretch

uname -a: Linux motionpi3 4.14.32-v7+ #1106 SMP Wed Apr 4 18:19:23 BST 2018 armv7l GNU/Linux

Replaced CanaKit 2.5 A Pi adapter with a new 3A capable Pi power adapter.

Pi used for a combination of Home Automation devices through hostapd, motion detection and Pihole.

top - 14:36:11 up 23:37, 1 user, load average: 1.93, 1.94, 1.95
Tasks: 107 total, 1 running, 66 sleeping, 0 stopped, 0 zombie
%Cpu(s): 6.0 us, 2.8 sy, 38.3 ni, 52.7 id, 0.1 wa, 0.0 hi, 0.3 si, 0.0 st
KiB Mem : 949452 total, 129212 free, 137728 used, 682512 buff/cache
KiB Swap: 102396 total, 102140 free, 256 used. 463916 avail Mem

Power usage:

Running headless with one usb based Wifi adapter:
Hawking Technologies HAWNU1 Hi-Gain Wireless-150N Network Adapter with Range Amplifier [Ralink RT3070]

No overclocking.

root@motionpi3:/etc/cron.daily# ls -l

total 64
-rwxr-xr-x 1 root root 268 Nov 3 2014 00logwatch
-rwxr-xr-x 1 root root 1474 Sep 13 2017 apt-compat
-rwxr-xr-x 1 root root 15001 Nov 21 2016 apt.dpkg-bak
-rwxr-xr-x 1 root root 314 Jun 15 2014 aptitude
-rwxr-xr-x 1 root root 355 Oct 28 2014 bsdmainutils
-rwxrwxrwx 1 root root 264 Sep 12 2016 ClearMotionLog
-rwxr-xr-x 1 root root 1597 Nov 26 2015 dpkg
-rwxr-xr-x 1 root root 338 Aug 6 2016 lighttpd
-rwxr-xr-x 1 root root 2211 Jul 11 2014 locate
-rwxr-xr-x 1 root root 90 Apr 5 06:49 logrotate
-rwxr-xr-x 1 root root 1065 Dec 13 2016 man-db
-rwxr-xr-x 1 root root 1386 Aug 8 2017 ntp
-rwxr-xr-x 1 root root 249 Jan 23 2016 passwd

So, I am puzzled why I get these Under-voltage messages only when it seems that cron.daily is running.

[simonk83]

I was getting the same, but replacing my power supply appears to have fixed it

[JamesH65]

These warning simply pass on the results of the low voltage detection circuitry. So you have a low voltage situation, usually caused by a inadequate power supply or power cable.

[picameratk]

As per my original discussion I bought a new power supply that is rated for 5v and 3A which is more powerful that the old 2.5A power adapters. I am getting the following messages using the new power adapter.

Also, I receive many more Voltage normalised messages that I do Under-voltage messages which I find curious as well.

grep Under /var/log/syslog
Apr 6 03:25:31 motionpi3 kernel: [131192.232834] Under-voltage detected! (0x00050005)

grep Voltage /var/log/messages
Apr 6 03:25:35 motionpi3 kernel: [131196.392873] Voltage normalised (0x00000000)
Apr 6 04:19:36 motionpi3 kernel: [134437.044976] Voltage normalised (0x00000000)
Apr 6 04:51:36 motionpi3 kernel: [136356.891041] Voltage normalised (0x00000000)
Apr 6 05:01:14 motionpi3 kernel: [136935.132919] Voltage normalised (0x00000000)
Apr 6 05:43:55 motionpi3 kernel: [139495.620991] Voltage normalised (0x00000000)
Apr 6 06:47:54 motionpi3 kernel: [143335.315353] Voltage normalised (0x00000000)
Apr 6 07:09:55 motionpi3 kernel: [144656.115042] Voltage normalised (0x00000000)
Apr 6 07:37:54 motionpi3 kernel: [146334.681245] Voltage normalised (0x00000000)
Apr 6 09:01:53 motionpi3 kernel: [151374.537690] Voltage normalised (0x00000000)
Apr 6 09:41:54 motionpi3 kernel: [153774.864817] Voltage normalised (0x00000000)
Apr 6 10:17:55 motionpi3 kernel: [155935.994672] Voltage normalised (0x00000000)
Apr 6 10:27:54 motionpi3 kernel: [156535.036185] Voltage normalised (0x00000000)
Apr 6 13:05:55 motionpi3 kernel: [166015.704445] Voltage normalised (0x00000000)
Apr 6 13:41:54 motionpi3 kernel: [168174.749814] Voltage normalised (0x00000000)
Apr 6 13:53:55 motionpi3 kernel: [168896.512111] Voltage normalised (0x00000000)
Apr 6 13:57:55 motionpi3 kernel: [169135.712821] Voltage normalised (0x00000000)
Apr 6 14:21:54 motionpi3 kernel: [170575.077509] Voltage normalised (0x00000000)

[simonk83]

Yep, I suspect your new power supply is no better. I bought one that was rated fine for the Pi as well, and it was still shitty. I ended up with an official one and it's fine.

[picameratk]

I appears that the Under-voltage issue was caused by a case fan that was powered off of the GPIO.