From: Guest, Ken (kengu at domain credo.ie)
Date: Thu 29 Apr 1999 - 16:39:32 IST
# From: Niall O Broin [mailto:nobroin at domain sced.esoc.esa.de]
# Sent: Thursday, April 29, 1999 04:30 PM
# To: ilug at domain linux.ie
# Subject: [ILUG] Setting RTC
#
# I have a Toshiba 4900CT notebook - 75MHz Pentium so of course totally
# obsolete as far as Windows users are concerned, but it's running Linux
# just fine with 40M of RAM and a 2GB disk so I'm a happy pig,
# particularly
# as I paid less than 300 quid S/H for it. However, I'm now
# trying to set
# the time/date on the RTC. The BIOS setup screen doesn't offer
# any means of
# doing this, but it can be done by booting from a DOS floppy
# and using the
# date command. However, I won't always have that DOS floppy
# handy, so I'm
# wondering if there is any way of changing the RTC date/time
# from Linux ?
#
# Reading Documentation/rtc.txt I came across this
#
# Also, if the kernel time is synchronized with an external source, the
# kernel will write the time back to the CMOS clock every 11
# minutes. In
# the process of doing this, the kernel briefly turns off RTC periodic
# interrupts, so be aware of this if you are doing serious work. If you
# don't synchronize the kernel time with an external source (via ntp or
# whatever) then the kernel will keep its hands off the RTC,
# allowing you
# exclusive access to the device for your applications.
#
# but it seems that simply changing the date/time by the date
# command doesn't
# count - I did that, waited somewhat more than 11 minutes,
# rebooted, and
# my date change was obliterated.
#
Were you doing this as root?
I remember, waay back in Limerick, trying to do this [well, something
similar] on the company proxy. Needless to say I wasn't logged in as
root and each time the flaky piece of machine rebooted the date change
that I put in was lost.
Ken
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