There is a hardware bug on some via 686a systems where the RTC appears
automagically change it's programmed value.
A patch was originally made against 2.4.2, and some version of this
appears to be applied to current kernels (I don't have a vanilla
2.4.17 to check against). Look in arch/i386/kernel/time.c for mention
of 686a.
It appears to only be used if the kernel's not compiled with
CONFIG_X86_TSC though, so if you have that defined you may not see the
problem at all...
Mark
On Wed, 27 Mar 2002, Bernd Schubert wrote:
> Date: Wed, 27 Mar 2002 16:28:35 +0100
> From: Bernd Schubert <bernd-schubert@web.de>
> To: linux-kernel@vger.kernel.org
> Subject: time jumps
>
> Hi,
>
> we have a computer here, that behaves very strange, from one second to
> another the clock changes to about 1h in the future. In the next "real"
> second the time is normal again.
> Well, I first thought that is might be a X problem, but after running a loop
> over "date", it really seems that the system clock is affected. Then I
> thought it might be a conflict with the hardware clock, but after resetting
> it to the system time, the problem was still there.
>
> The only clock that doesn't seem to be affected is the realtime clock (at
> least not when doing a loop of cat over the proc-file).
>
> The problem is, that this time jumps cause the Xserver to enable its
> screensaver (and several other small problems).
>
> System is: Athlon 650 on VIA board with linux-2.4.17 (unpatched)
>
>
> So has anyone an idea what to do, I'm thinking about a BIOS update (but don't
> really believe that it will help). Or is it possible to patch the kernel that
> it uses the realtime clock (could anyone of you send me this patch, if it is
> possible, please??).
>
>
> Of course, I can give further information, if needed.
>
> Thanks in advance, Bernd
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-- +-------------------------------------------------------------------------+ Mark Cooke The views expressed above are mine and are not Systems Programmer necessarily representative of university policy University Of Birmingham URL: http://www.sr.bham.ac.uk/~mpc/ +-------------------------------------------------------------------------+- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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