Subject: Re: Call for testing: ACPI standby/suspend support
To: Jared D. McNeill <>
From: Steven M. Bellovin <>
List: tech-kern
Date: 03/09/2006 13:20:23
On Thu, 9 Mar 2006 14:15:04 -0400 (AST)
"Jared D. McNeill" <> wrote:

> On Thu, 9 Mar 2006, Steven M. Bellovin wrote:
> >> One other oddity: when I *resume* from suspending, the laptop starts
> >> blinking a suspend indicator (a small moon-shaped LED), and when I
> >> suspend again, it turns off. This seems slightly backwards, but I
> >> don't know what layer is responsible for it.
> >
> > I wonder if that's related to the mutex.  A blinking crescent is supposed to indicate that it's in the process of suspending.  At a wild guess, there was some code that should have been entered that would turn it on *and* grab the mutex.
> FWIW, this mutex message is new. When I was working on this many blinking 
> crescents ago, I never saw the message. Perhaps it's a bug in the current 
> Intel acpica code (it's been known to happen).
Hmm -- no clue; that code is all a mystery to me.

Btw -- is there any way to work around the buggy firmware?  Thinkpads
are among the most common laptops.

		--Steven M. Bellovin,