Re: Usage of WoWLAN with iwlwifi driver (Device phy0 failed to suspend async: error -16)

[Johannes Berg <johannes@sipsolutions.net>]

> > Oh. Can you see if you have CONFIG_IWLWIFI_PCIE_RTPM enabled in
> > your configuration? If you do, please turn it off and see if that
> > fixes it.
> 
> Indeed, you got it! 
> I had it on, and turning that off lets me suspend just fine after
> activating WoWLAN!

[snip]

> The problem is that it seems I cannot actually wake the machine
> anymore afterwards... 
> While in the suspend procedure, I see:
> [12385.893568] iwlwifi 0000:0a:00.0: System wakeup enabled by ACPI
> as expected, I could neither get it to make a tcp connection in tcp-
> connection mode,
> nor could I wake the machine via magic packet in magic-packet mode. 
> 
> Could that be some hardware / system firmware limitation, e.g. if my
> UEFI does not support actually powering
> the WiFi hardware if I am in S3?

Yes. Does it print something to that effect at resume time? I think it
should.

> At least, the suspend problem seems to be clearly related to some
> path only used if CONFIG_IWLWIFI_PCIE_RTPM is on. 

Would you mind filing a bug on bugzilla.kernel.org (and adding linuxwif
i@intel.com as the assignee or at least in Cc)? I think we really ought
to sort out the issues with the RTPM stuff.

johannes