[ltp] Correcting clock after software suspend

Marius Gedminas linux-thinkpad@linux-thinkpad.org
Thu, 13 Nov 2003 21:04:25 +0200

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On Thu, Nov 13, 2003 at 05:51:41PM +0100, Florian Weimer wrote:
> On my T40p, I use the software suspend feature from kernel 2.6, but when
> the system is back up, the system clock is not updated.  Using an
> external NTP server is not always an option.
> Any ideas?  How can I detect that the system has been resumed?  Maybe
> it's sufficient to restore the system clock from the hardware clock.

Debian's apm package has scripts in /etc/apm/event.d that perform a
hwclock --systohc on suspend and hwclock --hctosys on resume.
Apparently this is needed for some systems.  (On my T23 it was not
necessary, *and* it caused frequent crashes a couple of seconds after a
resume.  So far I haven't found out why hwclock crashes my system; I
just commented out that line in the apm script.)

Marius Gedminas
C gives you enough rope to hang yourself. C++ also gives you the tree
object to tie it to.

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