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Date: Wed, 31 Jan 2018 11:33:33 +0200
From: Mika Westerberg <mika.westerberg@linux.intel.com>
To: Kai Heng Feng <kai.heng.feng@canonical.com>
Cc: linux-pci@vger.kernel.org, Ethan Hsieh <ethan.hsieh@canonical.com>
Subject: Re: Thunderbolt PCIe card doesn't get enumerated at cold boot
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On Wed, Jan 31, 2018 at 05:26:21PM +0800, Kai Heng Feng wrote:
> 
> > On 31 Jan 2018, at 4:51 PM, Mika Westerberg <mika.westerberg@linux.intel.com> wrote:
> > 
> > On Wed, Jan 31, 2018 at 04:23:21PM +0800, Kai Heng Feng wrote:
> >> Now sure which string to grep, but looks like hotplug is supported.
> >> Still attach dmesg to let you confirm it’s working.
> > 
> > This one:
> > 
> > [    0.197025] acpi PNP0A08:00: _OSC: OS supports [ExtendedConfig ASPM ClockPM Segments MSI]                                                                                                                         
> > [    0.197222] acpi PNP0A08:00: _OSC: platform does not support [PCIeHotplug PME AER]                                                                                                                                
> > [    0.197408] acpi PNP0A08:00: _OSC: OS now controls [PCIeCapability]            
> 
> So seems like it’s _OSC instead of _OSI?

Right, I always confuse the two.

> > So native PCIe hotplug is disabled.
> 
> Sorry for asking this again… is this the root cause of this issue?
> On another platform I can see the same message, but TBT card get enumerated at cold boot.

No, I just wanted to check which hotplug the system is using. Now it is
clear that it's using ACPI hotplug. So if possible try Windows first.