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Date: Wed, 31 Jan 2018 10:51:50 +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>,
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Subject: Re: Thunderbolt PCIe card doesn't get enumerated at cold boot
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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 native PCIe hotplug is disabled.