From: Shawn Willden <shawn-lkml@willden.org>
To: linux-kernel@vger.kernel.org
Subject: 2.6.8 Thinkpad T40, clock running too fast
Date: Tue, 2 Nov 2004 15:51:47 -0700
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I'm having a problem with the clock on my Thinkpad running too fast.  My clock
is gaining about 4 seconds every five minutes of operation.  I'm actually not
sure when this started because NTP has been fairly successful at keeping my
clock under control, so I didn't really notice it until I spent some time
operating disconnected... and then it became very obvious very quickly.

On October 15th, I "fixed" the problem by booting with "noapic" on the command
line.  Or I thought I fixed it anyway.  I had to reboot yesterday for an
unrelated issue (a "stuck" smb share that I couldn't figure out how to
unmount) and the racing clock is back.  I've booted with "noapic", "nolapic",
"noapic nolapic" and no options at all, and the clock doesn't keep the time
with any of them.  I'm not sure if it's always too fast.  I seem to remember
that last month it was running too slow.  I'll check with the various apic
settings and see if it's consistent.

I'm not sure what information I need to provide, but you can find my kernel
config at http://willden.org/~shawn/config-2.6.8.  It's built from the Debian
2.6.8 tree, with a custom config.  The CPU is a 1.6GHz Pentium M in a
"Centrino" chipset.

What should I be looking at to track this down?  I'm building a 2.6.9 kernel
but I haven't found any reports of similar problems corrected by it, so I
don't expect that to make a difference.

Thanks,

 Shawn.
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