From: Lee Revell <rlrevell@joe-job.com>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Pavel Machek <pavel@ucw.cz>, M <mru@mru.ath.cx>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: High pitched noise from laptop: processor.c in linux 2.6
Date: Sat, 16 Oct 2004 23:33:23 -0400 [thread overview]
Message-ID: <1097984002.2148.44.camel@krustophenia.net> (raw)
In-Reply-To: <1097979705.13269.9.camel@localhost.localdomain>
On Sat, 2004-10-16 at 22:21, Alan Cox wrote:
> On Sul, 2004-10-17 at 02:24, Lee Revell wrote:
> > > And heavily reduced accuracy on a lot of laptops where 1000Hz
> > > is enough to make the clock slide every time the battery state is
> > > queried or an SMM event triggers.
> > Wouldn't such a laptop be horribly broken? 1ms is a LONG time to
> > disable interrupts. That's millions of CPU cycles...
>
> Yes, and most laptops have this problem. They use SMM traps to talk to
> the battery including huge delay loops and during those SMM traps no
> interrupt code runs.
>
Ugh! I was under the impression that mostly older machines had this
problem and it was a minority of laptops. I could not find a lot of
info on SMM - several of the links I found were DDJ "Undocumented
Corner" articles.
Anyway this explains probably half the weird bug reports on the linux
audio user list.
Lee
next prev parent reply other threads:[~2004-10-17 3:44 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-10-07 9:30 Fraz
2004-10-07 10:32 ` Pavel Machek
2004-10-07 10:53 ` Måns Rullgård
2004-10-07 14:32 ` Pavel Machek
2004-10-16 19:52 ` Lee Revell
2004-10-16 21:46 ` Alan Cox
2004-10-17 1:24 ` Lee Revell
2004-10-17 1:50 ` Kyle Moffett
2004-10-17 2:21 ` Alan Cox
2004-10-17 3:33 ` Lee Revell [this message]
2004-10-22 11:40 ` Alexandre Oliva
2004-10-16 19:59 ` Måns Rullgård
2004-10-16 20:42 ` Pavel Machek
2004-10-07 14:34 ` Pavel Machek
2004-10-17 0:45 ` Alex Riesen
2004-10-07 10:37 ` Christian Hesse
2004-10-17 5:21 Albert Cahalan
2004-10-18 3:51 Yu, Luming
2004-10-18 11:41 ` Pavel Machek
2004-10-20 14:47 ` Måns Rullgård
2004-10-20 15:47 ` Pavel Machek
2004-10-20 16:37 ` Måns Rullgård
2004-10-20 16:49 ` Jan-Benedict Glaw
2004-10-20 16:53 ` Pavel Machek
2004-10-20 16:53 ` Lee Revell
2004-10-20 17:13 ` Måns Rullgård
2004-10-21 20:32 ` Lee Revell
2004-10-21 21:39 ` Jon Masters
2004-10-20 23:31 ` Giuseppe Bilotta
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