From: Pavel Machek <pavel@ucw.cz>
To: Brad Campbell <brad@wasp.net.au>
Cc: suspend2-devel@lists.suspend2.net, lkml <linux-kernel@vger.kernel.org>
Subject: Re: /dev/rtc not suspending/resuming properly
Date: Tue, 11 Jul 2006 00:36:29 +0200 [thread overview]
Message-ID: <20060710223629.GA7443@elf.ucw.cz> (raw)
In-Reply-To: <44B24CEB.9010103@wasp.net.au>
Hi!
> In trying to track down a bug in an application, I think I may have
> stumbled across one in the kernel.
Well, that happens in suspend/resume area...
> It would appear that the rtc device is not restoring the state of the PIE
> control bit when the machine goes to sleep and then wakes up again,
> resulting in the rtc_dropped_irq() being called repeatedly until the
> application accessing /dev/rtc is stopped.
>
> I'm using a vanilla 2.6.17.3 kernel with the suspend2 patch only on x86
>
> I've had a pretty good look at drivers/char/rtc.c and I can't see anywhere
> it would actually suspend/resume in the code, and investigation shows it
> does not appear to re-init the hardware on resume.
Well, you probably need to write suspend/resume support for it...
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
next prev parent reply other threads:[~2006-07-10 23:32 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-07-10 12:49 /dev/rtc not suspending/resuming properly Brad Campbell
2006-07-10 22:36 ` Pavel Machek [this message]
2006-07-11 7:57 ` Brad Campbell
2006-07-11 11:18 ` Pavel Machek
2006-07-11 11:31 ` Brad Campbell
2006-07-11 11:33 ` Pavel Machek
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