[linux-pm] Linux 3.0-rc4 intermittent failure to resume

Rafael J. Wysocki rjw at sisk.pl
Wed Jun 29 12:34:34 PDT 2011


On Wednesday, June 29, 2011, Brad Campbell wrote:
> On 28/06/11 10:39, Brad Campbell wrote:
> > On 24/06/11 10:41, Brad Campbell wrote:
> >> On 23/06/11 20:02, Rafael J. Wysocki wrote:
> >>> On Thursday, June 23, 2011, Brad Campbell wrote:
> >>>> G'day all,
> >>>>
> >>>> I've recently moved from tuxonice to mainline uswsusp. I'm getting intermittent failure to resume
> >>>> problems. No message in dmesg that I can find, it just boots clean. Is there something I can do to
> >>>> get some debug info on this? It's really, really annoying.
> >>>>
> >>>> About 75% of the time it works perfectly, and I can find no rhyme or reason to why it suddenly just
> >>>> decides to ignore the saved state.
> >>>>
> >>>> 32 bit userspace with a statically linked 64 bit s2disk, s2both&    resume. 64 bit kernel.
> >>> Do you use the i915 driver?
> >>>
> >> Indeed I do.
> > Just a follow up to this.
> > It looks like adding "early writeout = y" to my /etc/suspend.conf has worked around the problem.
> >
> 
> Ok, so after _lots_ of investigating it was not early writeout. The 
> culprit was/is the Ubuntu initramfs scripts.
> 
> On the occasions it failed to resume (which were many) it turns out 
> /bin/resume was being called prior to udev having created /dev/snapshot.
> 
> I put a simple wait loop in the resume script to wait for the creation 
> of /dev/snapshot and I've not had a fail to resume since.
> 
> Curse you asynchronous dynamic device creation <shakes fist>

Thank you very  much for nailing this down, I was afraid there were some
obscure bug lurking in the kernel code.

Take care,
Rafael


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