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Kovacs, Alexander ; Mika Westerberg > Cc: linux-pci@vger.kernel.org; linux-usb@vger.kernel.org; bhelgaas@google.com; westeri@kernel.org; andreas.noever@gmail.com; YehezkelShB@gmail.com; rafael@kernel.org; linux-pm@vger.kernel.org; S, Sanath ; Natikar, Basavaraj ; Martinez, Juan > Subject: Re: [BUG] PCI/USB4: AMD Phoenix 1022:14ef runtime suspend prevents JHL9480 downstream enumeration > > Caution: This message originated from an External Source. Use proper caution when opening attachments, clicking links, or responding. > > > Hi Mario, Mika and Alex, > > I tested the Kensington SD5000T5 dock again by using Ubuntu 26.04.1 Live with kernel 7.0.0-30-generic and thunderbolt.dyndbg=+p. The dock was disconnected at boot, and I did not run lspci before the hotplug log and power states had been saved. > > In this Ubuntu run the PCIe/USB enumeration worked without any workaround: > > 426.716: USB4 dock connection detected (host port 0:2, link up) > 426.753: Kensington SD5000T5 discovered > 428.410: PCIe Down path activation complete > 428.411: PCIe Up path activation complete > 429.025: pcieport 0000:00:04.1 reports Card present / Link Up > 429.026: downstream 0000:09:00.0 (8086:5786) enumerated > > After the dock had connected, but *before* running lspci, the sysfs states were: > > 0000:00:04.1 power/control=auto; runtime_status=active; power_state=D0 > 0000:09:00.0 present > 0000:6b:00.6 runtime_status=active; power_state=D0 > > The downstream USB devices and dock Ethernet also enumerated. I then ran lspci once: 0000:00:04.1 remained active/D0, 0000:09:00.0 remained present. Thus this run cannot show an lspci-triggered wakeup or a resulting PME event: it was already working. > In my previous failing CachyOS runs, invoking lspci could wake 00:04.1 and make 09:00.0 appear. I do not see an explicit PME delivery message at hotplug in the Ubuntu dmesg. > > The external display did still flicker. The Ubuntu log includes one DP tunnel DPRX read timeout at ~431.188s, followed by a completed capability read at ~431.239s, I do not know if it's related. > > Attached are the full Ubuntu dmesg after/before hotplug and the state files. > Unrelated USB serial numbers and network interface MAC addresses are redacted. > > Thanks, > Freeman > OK, so IMV either: A) We Have a regression from mainline 7.0 to mainline 7.2. B) Cachy OS has a patch that is causing the issue. C) There is a patch Ubuntu's distro kernel that is helping. I think we need to narrow down which of those is the case. Can you please check out and build a mainline 7.0 tag on your Cachy and see if you can reproduce? If you can't reproduce; check out a mainline 7.2 tag and see if you can.