Re: [9fans] rio and acme scrolling

[David Presotto <presotto@closedmind.org>]

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The clock (timer 2) speeds up by a factor of 5 or so.
I can only assume that the firmware uses it for something
to do with detecting the lid opening again.

Timesync doesn't change the local hardware, it just
tweaks the kernel's idea of what time it is and of
what the clock frequency is.  It would cope with
the clock change except that I made timesync ignore any huge
swings (anything more than 25%) because I had assumed that
would only be the result of a samplng mistake.

I changed the limits and timesync will now put up with such a
change, though it will take some minutes to latch onto
the exact new value (needs enough of a time base to
compare to).

Tell me if this is a problem.  Short of actually
implementing ACPI, I think this is as good as we can
do.

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From: Micah Stetson <micah@cnm-vra.com>
To: 9fans@cse.psu.edu
Subject: Re: [9fans] rio and acme scrolling
Date: Fri, 26 Mar 2004 21:07:54 -0800
Message-ID: <20040327050754.GA20193@epaphras.cnm-vra.com>

On Fri, Mar 26, 2004 at 08:51:26PM -0500, Russ Cox wrote:
> date; sleep 10; date

On Fri, Mar 26, 2004 at 10:14:49PM -0500, jmk@plan9.bell-labs.com wrote:
> We discovered that when the laptop has the lid closed, on re-opening
> some of the clocks have been altered by the BIOS/APM. The real
 ...
> As Presotto said, time is, indeed, slippin' slippin' slippin' into
> the future.

Thanks, guys, that's exactly it.  When I boot the system
from the hard disk, it doesn't have the problem.  But if
I simply close the lid and reopen it, windows scroll like
lightning and sleep 10 sleeps for about 3 seconds.  The
thought of the clock running out of control had flitted
into my mind yesterday, but I didn't actually consider
it, that should teach me.

Micah