Re: Missing Time (There be Aliens?)
Hi,
I have been using different flavours of Linux on all sorts of laptops, but
there was never (well, hardly ever ;--) a problem with clock times or
suspend modes, when
a) the kernel was build supporting power management
b) an apmd was running,
as was pointed out by different people on this list, already.
On newer machines and kernels (I'm currently running a Thinkpad600), I
found that the apmd won't be necessary - linux has now enough APM magic
built in to suit at least my needs. :-)
In either case, something should tell the hardware clock what to do before
and after a suspend / hibernation. If you're lucky, the kernel APM stuff
suffices. Else you could give the apmd a try.
Hope this helps.
Regards,
Stefan
If you like, here are the APM settings of my (somewhat out of date) 2.2.1
kernel:
CONFIG_APM=y
# CONFIG_APM_IGNORE_USER_SUSPEND is not set
CONFIG_APM_DO_ENABLE=y
# CONFIG_APM_CPU_IDLE is not set
# CONFIG_APM_DISPLAY_BLANK is not set
CONFIG_APM_POWER_OFF=y
CONFIG_APM_IGNORE_MULTIPLE_SUSPEND=y
CONFIG_APM_IGNORE_SUSPEND_BOUNCE=y
CONFIG_APM_RTC_IS_GMT=y
CONFIG_APM_ALLOW_INTS=y
On Tue, 31 Aug 1999, Nathan Duehr wrote:
> After Linux boots, the system clock runs without input from the CMOS
> clock. Probably during "suspend" the system clock stops, and restarts
> when coming out of suspend mode.
>
> Then, since the Debian startup/shutdown scripts do the clock --systohc
> upon shutdown, the "wrong" time gets put in CMOS and then the next time
> you boot the entire clock setup is messed up.
>
> Perhaps check the system clock after a suspend and see if it's actually
> stopping? If so, there will probably have to be written something to run
> clock --hwtosys during a resume from suspend.
>
> I also run NTP on my laptop to a local server, but I can see where this
> doesn't help if the system clock is moving by quite a bit because NTP will
> refuse to update the clock if the system time is off by more than a small
> amount.
>
> By the way, disclaimer here: I don't suspend my laptop (yet)... just
> haven't gotten around to setting it up, and now I'm wondering if it's more
> trouble than it's worth. The extra minute or two to boot would be worth
> it to me to not have to deal with clock problems.
>
>
> On 31 Aug 1999, Shaun Lipscombe wrote:
>
> >
> > Hi,
> >
> > Both me and a friend run Debian on laptops (as well as Desktops). We
> > are both experiencing the same problem. The problem is namely,
> > incorrect system time. Strange as it may seem, the BIOS is drifting
> > and I don't think its my CMOS battery.... as my friend is having the
> > same problems. It must be something to do with the clock --set
> > ...blah --hctosys on boot, and clock --set ...blah --systohc on
> > shutdown. Has anyone else seen this behaviour, or does anyone know
> > how I can track this lil' one down?
> >
> > Thanks,
> >
> > Shaun
> >
> > --
> > (o_
> > (o_ (o_ //\
> > (/)_ (/)_ V_/_ shaun.lipscombe@gasops.co.uk
> >
> >
> > --
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> >
> >
>
> +-----------------------------------+--------------------------------+
> | Nate Duehr - nate@natetech.com | Support Amateur Radio & Linux! |
> | Private Pilot, Telephony Engineer | Ham Callsign: N0NTZ |
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>
> --
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>
Stefan W.M. Frank
--
IT Consultant +49 9331 80643
(Fax) +49 9331 80642
Johann-Fesel-Strasse 21 sfrank@swmf.de
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