kern/63431: motherboard going to suspend mode stops system clock
jin at adsl-63-198-35-122.dsl.snfc21.pacbell.net
Thu Feb 26 20:40:07 PST 2004
>Synopsis: motherboard going to suspend mode stops system clock after 4.9-R
>Arrival-Date: Thu Feb 26 20:40:06 PST 2004
>Originator: Jin Guojun[VFF]
>Release: FreeBSD 4.9-RELEASE i386
System: FreeBSD spode.pacbell.net 4.9-RELEASE FreeBSD 4.9-RELEASE #0: Sat Nov 1 18:00:32 PST 2003 root at spode.pacbell.net:/usr/src/sys/compile/MinMax i386
FreeBSD 4.9-RELEASE and later.
May be for all motherboards, but at least for listed below:
If BIOS of a motherboard is set for suspend/stand-by mode when
system is idle for a certain time, system will go into stand-by
or suspend mode.
I do not remember 4.8-R or earlier has problem on the system clock.
But system clock is off when system is in suspend mode in 4.9-R and 5.2-R.
After wake up, system did not syn its clock with the RTC.
Two ways to correct system clock:
use date command to update the time manually
reboot the system (this means RTC is still correct)
Try to enable "suspend mode" in power management in BIOS.
When system is suspended, only keyboard can wake it up
by default. Maybe some motherborad can be waked up by LAN.
I do not know if system can detect a wake up signal.
If so, it should check if system clock is off from RTC.
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