linux-kernel - Re: PROBLEM: Suspend corrupts bios clock since 2.6.21

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Date:	Tue, 28 Aug 2007 09:04:30 +0200
From:	Andreas Steffan <a.steffan@...s-online.de>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Robert Hancock <hancockr@...w.ca>,
	linux-pm@...ts.linux-foundation.org, pavel@...e.cz,
	linux-kernel@...r.kernel.org
Subject: Re: PROBLEM: Suspend corrupts bios clock since 2.6.21

On Mon, 2007-08-27 at 00:45 +0200, Rafael J. Wysocki wrote:

> > > PS: I have not yet tried 2.6.22.4-65.fc7, but the latest 2.6.22 kernel
> > > before showed the same behaviour for me.
> > 
> > Please check if PM_TRACE is enabled in your kernel configuration. It 
> > will do this intentionally.
> 
> Yes, but only if you have "1" in /sys/power/pm_trace ...

I guess this is the case on my system.

I was/am encountering "resume from memory" problems. In approx 1 of 3
cases, the display remained switched off after resume, the harddisk was
spinning and it seemed the keyboard did not work either. This is the
reason why I've set 1 in /sys/power/pm_trace. I was hoping this could
help gathering information (dmsg after resume) to track down the
occasional "resume from memory" problem. I was not aware that the 1
in /sys/power/pm_trace could have side effects ("currupted" bios clock),
so I kept this setting.

Any help or suggestion how to track down the "suspend from memory
sometimes results in black display and keyboard not working problem"
would really be appreciated.

Now, I am trying kernel 2.6.22.4-65.fc7 (w/o pm_trace set to 1).
Unfortunately, with this kernel, pm-suspend and pm-hibernate both
don't work. Suspending freezes after

Suspending console(s)

with the lock lights flashing.

I was not observing this problem with 2.6.22.1-41. I'll try this
one again w/o /sys/power/pm_trace set to 1.

Thanks so far !
--
regards 
Andreas

+-----------------------------------------------------------+
Andreas Steffan              email: a.steffan@...s-online.de
Hamburg, Germany             mobil: +49179 3903615
+-----------------------------------------------------------+

In theory, practice and theory are the same, but in practice
they are different -- Larry McVoy
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