On 12/11/2016 7:01 PM, geo.inbox.ignored wrote: > - part 1: clock losing time > > first noticed time was off by 8 min, reset via F2 cl terminal. > > ~40 min later, off by ~2 min, reset via 'service manager' by stopping > ntpd, count 20, started ntpd, within a few seconds, clock reset to > correct time. > > ~1 hour later, noticed clock off again, considered cause to be cmos > battery failing. after removing ~30 screws and bottom cover, found > that cmos batter was soldered to board. checked with dvom, voltage > read 3.2v with main battery and charger removed. > > ran web search on tower box to find that cmos battery is a rechargeable > 3.0 v battery and being that removing screws and cover took several > minutes, with battery being up, cause must be elsewhere. normally, the CMOS clock is just used to set the system time when the system boots (or wakes up from sleep/hibernate), after that the time is maintained by the OS via timer interrupts. my usual solution to time problems is to configure ntpd, but that may not be suitable for a laptop. the tzdata is used for time zone offsets, daylight savings time computations, etc. it should have no impact on the time of day maintained by the kernel. -- john r pierce, recycling bits in santa cruz