linux-kernel - Re: 3.12: ethernet controller missing after resuming from suspend to RAM

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Date:	Sat, 08 Feb 2014 22:34:23 +0100
From:	Peter Wu <lekensteyn@...il.com>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:	Bastien Traverse <bastien.traverse@...il.com>,
	linux-kernel@...r.kernel.org, francis.moro@...il.com,
	linux-pm@...r.kernel.org
Subject: Re: 3.12: ethernet controller missing after resuming from suspend to RAM

On Saturday 08 February 2014 16:01:36 Rafael J. Wysocki wrote:
> It looks like we fail to resume the device, then, for some reason.
> 
> That may be a PCIe link issue or something similar.
> 
> Is this a regression for you?  If so, what's the last kernel that didn't
> have this problem?  Does 3.13.y (as released by Greg, without and distro
> "improvements") have it too?

It was a regression from 3.11.x to 3.12 (and it is still broken with 3.13).
Due to some mistakes from my side, I have tested more configs:

(based on Arch Linux 3.13.1 x86_64 config)
(a) 3.13.2 with CONFIG_HOTPLUG_PCI=y, but CONFIG_HOTPLUG_PCI_ACPI=n works.
(b) 3.13.2 with CONFIG_HOTPLUG_PCI=y and CONFIG_HOTPLUG_PCI_ACPI=y is broken.
(c) 3.13.2 with CONFIG_HOTPLUG_PCI=n still works.
(my stripped config)
(d) 3.13.2 with CONFIG_HOTPLUG_PCI=y, but CONFIG_HOTPLUG_PCI_ACPI=n works.

With CONFIG_HOTPLUG_PCI_ACPI=y, the only difference in dmesg is:

(during boot)
acpiphp: ACPI Hot Plug PCI Controller Driver version: 0.5
(after resume)
iwlwifi 0000:05:00.0: no hotplug settings from platform
xhci_hcd 0000:02:00.0: no hotplug settings from platform
 (here, NetworkManager complains that a device has gone)
iwlwifi 0000:05:00.0: no hotplug settings from platform

Of course, with config (b), the ethernet adapter vanishes while it is still
present with configs (a), (c) and (d).

Time to do a bisect?

Peter

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