From: Pavel Machek <pavel@suse.cz>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: sfr@canb.auug.org.au, twoller@crystal.cirrus.com,
linux-kernel@vger.kernel.org
Subject: Re: Incorrect mdelay() results on Power Managed Machines x86
Date: Mon, 26 Mar 2001 00:06:40 +0000 [thread overview]
Message-ID: <20010326000639.B50@(none)> (raw)
In-Reply-To: <E14gOH2-0004Mm-00@the-village.bc.nu>; from alan@lxorguk.ukuu.org.uk on Fri, Mar 23, 2001 at 09:54:21AM +0000
Hi!
> > On the ThinkPad 600E (at least), we get a Power Status Change APM event.
>
> Any reason we couldn't recalibrate the bogomips on a power status change,
> at least for laptops we know appear to need it (I can make the DMI code look
> for matches there..)
Notice that this is not 100% solution. APM is async, and you might already
did few wrong delays by the time apm event is delivered to you.
Also notice that at least my toshiba goes low speed (150MHz) on
*) batteries going low
*) overheat
It goes back to 300MHz at ac power. Another crazy thing: it goes down to
35MHz on extreme overheat -- that's factor of 10 change.
--
Philips Velo 1: 1"x4"x8", 300gram, 60, 12MB, 40bogomips, linux, mutt,
details at http://atrey.karlin.mff.cuni.cz/~pavel/velo/index.html.
next prev parent reply other threads:[~2001-03-28 20:57 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-03-23 4:00 Incorrect mdelay() results on Power Managed Machines x86 sfr
2001-03-23 9:54 ` Alan Cox
2001-03-26 0:06 ` Pavel Machek [this message]
-- strict thread matches above, loose matches on Subject: below --
2001-03-30 17:17 Grover, Andrew
2001-03-29 18:30 Woller, Thomas
2001-03-28 23:12 Grover, Andrew
2001-03-29 4:10 ` Alan Cox
2001-03-24 3:55 sfr
2001-03-23 16:43 Woller, Thomas
2001-03-22 23:26 Woller, Thomas
2001-03-22 23:37 ` Alan Cox
2001-03-23 1:42 ` Tim Wright
2001-03-23 9:45 ` Alan Cox
2001-03-22 22:53 Grover, Andrew
2001-03-22 23:07 ` Alan Cox
2001-03-26 0:00 ` Pavel Machek
2001-03-22 20:29 Woller, Thomas
2001-03-22 21:26 ` Alan Cox
2001-03-23 6:43 ` Dave Zarzycki
2001-03-22 23:29 ` Pavel Machek
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