From: Nicholas Johnson <nicholas.johnson@outlook.com.au>
To: Bjorn Helgaas <bhelgaas@google.com>
Cc: Nicholas Johnson <nicholas.johnson@outlook.com.au>,
"linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: [PATCH 0/1] Fix Thunderbolt enumeration
Date: Tue, 23 Jun 2026 15:53:11 +0000 [thread overview]
Message-ID: <20260623155256.32688-1-nicholas.johnson-opensource@outlook.com.au> (raw)
I have an Alienware 8950HK with the Thunderbolt 3 port (JHL6340) and OS Native
Enumeration. Unless the Thunderbolt device was attached at boot time, it was
failing to enumerate. I have not bisected the kernel to find out what commit
caused this, but I offer this fix, which I verify fixes the problem.
Here is the problem without the fix applied:
-[0000:00]-+-00.0 Intel Corporation 8th/9th Gen Core Processor Host Bridge / DRAM Registers
+-01.0-[01]--+-00.0 NVIDIA Corporation GP104M [GeForce GTX 1080 Mobile]
| \-00.1 NVIDIA Corporation GP104 High Definition Audio Controller
+-01.1-[02-09]--
+-01.2-[0a-42]----00.0-[0b-0e]--+-00.0-[0c]----00.0 Intel Corporation JHL6340 Thunderbolt 3 NHI (C step) [Alpine Ridge 2C 2016]
| +-01.0-[0d]----00.0-[0e]--
| \-02.0-[0e]----00.0 Intel Corporation JHL6340 Thunderbolt 3 USB 3.1 Controller (C step) [Alpine Ridge 2C 2016]
And here we are with the fix applied:
-[0000:00]-+-00.0 Intel Corporation 8th/9th Gen Core Processor Host Bridge / DRAM Registers
+-01.0-[01]--+-00.0 NVIDIA Corporation GP104M [GeForce GTX 1080 Mobile]
| \-00.1 NVIDIA Corporation GP104 High Definition Audio Controller
+-01.1-[02-09]--
+-01.2-[0a-42]----00.0-[0b-42]--+-00.0-[0c]----00.0 Intel Corporation JHL6340 Thunderbolt 3 NHI (C step) [Alpine Ridge 2C 2016]
| +-01.0-[0d-41]----00.0-[0e-10]--+-00.0-[0f]----00.0 PreSonus Audio Electronics Inc. Quantum 2626
| | \-01.0-[10]--
| \-02.0-[42]----00.0 Intel Corporation JHL6340 Thunderbolt 3 USB 3.1 Controller (C step) [Alpine Ridge 2C 2016]
I was hoping to get this into Linux v7.2 as a last minute bugfix, but if not, we
can aim for 7.3 hopefully.
Kind regards,
Nicholas Johnson (1):
PCI: Fix bus number allocation for switches with multiple downstream
ports
drivers/pci/probe.c | 11 +++++++++++
1 file changed, 11 insertions(+)
--
2.53.0
next reply other threads:[~2026-06-23 15:53 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-06-23 15:53 Nicholas Johnson [this message]
2026-06-23 15:55 ` [PATCH 1/1] PCI: Fix bus number allocation for switches with multiple downstream ports Nicholas Johnson
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