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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/
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