So looks like it is slow to sync with RTC.
ubuntu@tiselius:~$ sudo /sbin/hwclock --set --date "2004/11/21 04:10:00"; sudo
strace -e ioctl "/sbin/hwclock"
ioctl(4, RTC_UIE_ON) = -1 EINVAL (Invalid argument)
ioctl(4, RTC_RD_TIME, {tm_sec=0, tm_min=10, tm_hour=4, tm_mday=21, tm_mon=10,
tm_year=104, ...}) = 0
ioctl(4, RTC_RD_TIME, {tm_sec=0, tm_min=10, tm_hour=4, tm_mday=21, tm_mon=10,
tm_year=104, ...}) = 0
when the hwclock command fails, the ioctl that fails is RTC_RD_TIME..
but running it with --verbose probably gives it just enough time to
complete the sync.
Or you could use the command as follows:
ubuntu@tiselius:~$ sudo /sbin/hwclock --set --date "2004/11/22 04:10:00"; sudo
/sbin/hwclock --delay=0.5
2004-11-22 04:09:59.898618+00:00
ubuntu@tiselius:~$
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https://bugs.launchpad.net/bugs/1802233
Title:
hwclock test failed on Power9 due to 0.x sec differences / time out
waiting for time change
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