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 High pitched noise from laptop: processor.c in linux 2.6 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
-- strict thread matches above, loose matches on Subject: below --
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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1097984002.2148.44.camel@krustophenia.net \
--to=rlrevell@joe-job.com \
--cc=alan@lxorguk.ukuu.org.uk \
--cc=linux-kernel@vger.kernel.org \
--cc=mru@mru.ath.cx \
--cc=pavel@ucw.cz \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.