Message-Id: <201101312300.34008.rjw@suse.com>
Date:	Mon, 31 Jan 2011 23:00:33 +0100
From:	"Rafael J. Wysocki" <rjw@...e.com>
To:	Jiri Slaby <jirislaby@...il.com>
Cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	"Linux-pm mailing list" <linux-pm@...ts.linux-foundation.org>
Subject: Re: Resume hangs [was: mmotm 2010-12-02-16-34 uploaded]

On Monday, January 31, 2011, Jiri Slaby wrote:
> On 01/20/2011 10:02 PM, Rafael J. Wysocki wrote:
> > On Thursday, January 20, 2011, Jiri Slaby wrote:
> >> On 01/06/2011 03:18 PM, Jiri Slaby wrote:
> >>> On 12/14/2010 11:22 PM, Rafael J. Wysocki wrote:
> >>>> On Tuesday, December 14, 2010, Jiri Slaby wrote:
> >>>>> On 12/13/2010 10:10 PM, Rafael J. Wysocki wrote:
> >>>>>> On Monday, December 13, 2010, Jiri Slaby wrote:
> >>>>>>> On 12/05/2010 02:08 PM, Rafael J. Wysocki wrote:
> >>>>>>>> On Sunday, December 05, 2010, Jiri Slaby wrote:
> >>>>>>>>> On 12/03/2010 01:34 AM, akpm@...ux-foundation.org wrote:
> >>>>>>>>>> The mm-of-the-moment snapshot 2010-12-02-16-34 has been uploaded to
> >>>>>>>>>
> >>>>>>>>> Hi, this kernel regresses with respect to resume. It doesn't wake up,
> >>>>>>>>> the screen is black with blinking cursor at position [1, 1].
> >>>>>>>>> 2010-11-23-16-12 seemed to be OK. In this one it is 100% reproducible so
> >>>>>>>>> far.
> >>>>>>>>>
> >>>>>>>>> I'm using pm-suspend, any ideas what to test before I start to find the
> >>>>>>>>> reason on my own?
> >>>>>>>>
> >>>>>>>> Please try the pm_test tests for core, processors and devices, eg.:
> >>>>>>>
> >>>>>>> Hmm, I haven't seen the issues since then. So it had to be some kind of
> >>>>>>> coincidence -- I see the issue occasionally for some time already. Now
> >>>>>>> it triggered twice in a row after I updated the kernel.
> >>>>>>
> >>>>>> Hmm.  What hardware is that?
> >>>>>
> >>>>> What exactly do you want to know about it? It's some specific intel
> >>>>> desktop machine, 3 years old, 2 intel cores, 6G of mem, 2 sata disks in
> >>>>> raid, dvb-t usb receiver (af9015), usb keyboard and mouse.
> >>>>
> >>>> I'm seeing pretty much the same symptoms on quite different hardware, except
> >>>> for one thing: USB keyboard and mouse.
> >>>>
> >>>> Have you checked if writing 0 to /sys/power/pm_async helps?
> >>>
> >>> It's very hard to reproduce (it happens once a week or two), so I can't
> >>> say yet. As it happened yesterday again, going to test it from now on.
> >>
> >> Ok, I haven't seen the issue with 0 in /sys/power/pm_async for two weeks
> >> now (I added it to boot.local). I would say it's related to that...
> > 
> > In that case the next step would be to build the kernel with
> > CONFIG_PM_ADVANCED_DEBUG set and try to switch the async flag for individual
> > devices (it is located is /sys/devices/.../power/ for each device).
> > 
> > For example, I wonder if it is sufficient to unset it for all USB devices.
> 
> It seems to suffice... No hangs still. Should I enable pm_async back
> again to confirm the issue is still present?

Yes, please, it would be good to know for sure.

> Note that I also had had issues with fan which was at full speed after
> resume sometimes (very rarely, like this issue). Full power-cycle was
> needed to cure that. I don't see that now as well.

This most likely was a different issue and I'd expect it to be fixed by
the ACPI patches that went in during the last merge window.

Thanks,
Rafael
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Powered by blists - more mailing lists