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No meaningful message showed on the kernel >>>> boot screen. >>>> >>>> A bisect revealed the culprit to be >>>> >>>> commit f1bfb4a6fed64de1771b43a76631942279851744 (HEAD) >>>> Author: Mathias Nyman >>>> Date: Fri Aug 30 18:26:29 2024 +0300 >>>> >>>> usb: acpi: add device link between tunneled USB3 device and USB4 Host Interface >>>> >>>> A revert of this single patch "fixes" the issue and I can boot again. >>>> The system in question is a Thinkpad T14 with a Ryzen 7 PRO 6850U CPU. >>>> It's running Arch Linux but I doubt that's of consequence. >>>> >>>> lspci output: >>>> https://gist.github.com/hwentland/59aef63d9b742b7b64d2604aae9792e0 >>>> acpidump: >>>> https://gist.github.com/hwentland/4824afc8d712c3d600be5c291f7f1089 >>>> >>>> Mario suggested I try modprobe.blacklist=xhci-hcd but that did nothing. >>>> Another suggestion to do usbcore.nousb lets me boot to the desktop >>>> on a kernel with the faulty patch, without USB functionality, obviously. >>>> >>>> I'd be happy to try any patches, provide more data, or run experiments. >>> >>> Do you boot with any device connected? >>>> Second thing that I noticed, though I'm not familiar with AMD hardware, >>> but from your lspci dump, I do not see the PCIe ports that are being >>> used to tunnel PCIe. Does this system have PCIe tunneling disabled >>> somehow? >> >> On some OEM systems it's possible to lock down from BIOS to turn off PCIe >> tunneling, and I agree that looks like the most common cause. >> >> This is what you would see on a system that has tunnels (I checked on my >> side w/ Z series laptop w/ Rembrandt and a dock connected): >> >> +-03.0 >> +-03.1-[03-32]-- >> +-04.0 >> +-04.1-[33-62]----00.0-[34-62]--+-02.0-[35]----00.0 >> | \-04.0-[36-62]-- >> >> 00:03.0 Host bridge [0600]: Advanced Micro Devices, Inc. [AMD] Family >> 17h-19h PCIe Dummy Host Bridge [1022:14b7] (rev 01) >> 00:03.1 PCI bridge [0604]: Advanced Micro Devices, Inc. [AMD] Family 19h >> USB4/Thunderbolt PCIe tunnel [1022:14cd] >> 00:04.0 Host bridge [0600]: Advanced Micro Devices, Inc. [AMD] Family >> 17h-19h PCIe Dummy Host Bridge [1022:14b7] (rev 01) >> 00:04.1 PCI bridge [0604]: Advanced Micro Devices, Inc. [AMD] Family 19h >> USB4/Thunderbolt PCIe tunnel [1022:14cd] > > Okay this is more like what I expected, although probably not the > reason here. > > Are you able to replicate the issue if you disable PCIe tunneling from > the BIOS on your reference system? (Probably not but just in case). I checked on the Lenovo Z13 laptop I have and turned off "USB port" in BIOS setup and this caused the endpoints 3.1 and 4.1 I listed above to disappear but the system still boots up just fine for me on 6.12-rc1. > >>> You don't see anything on the console? It's all blank or it just hangs >>> after some messages? >> >> I guess it is getting stuck on fwnode_find_reference() because it never >> finds the given node? > > Looking at the code, I don't see where it could get stuck. If for some > reason there is no such reference (there is based on the ACPI dump) then > it should not affect the boot. It only matters when power management is > involved. Nothing jumps out to me either. Maybe this is a situation that Harry can sprinkle a bunch of printk's all over usb_acpi_add_usb4_devlink() to enlighten what's going on (assuming the console output is "working" when this happened).