Re: [REGRESSION][BISECTED] "xHCI host controller not responding, assume dead" on stable kernel > 6.8.7

From: Gia
Date: Mon May 20 2024 - 13:31:39 EST

In my case I use the official Thunderbolt cable that came with my
CalDigit TS3 Plus and yet the log - attached in a previous email -
says current link speed 10.0 Gb/s. I just tried a good quality USB4
cable too and nothing changed.

Maybe it's relevant to note that I'm using the Thunderbolt dock via
USB4 on a PC with an AMD Ryzen 7 7735HS.

On Mon, May 20, 2024 at 6:53 PM Benjamin Böhmke <benjamin@xxxxxxxxxxx> wrote:
>
> On Monday, May 20, 2024 18:21 CEST, Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx> wrote:
>
> > Hi,
> >
> > On Mon, May 20, 2024 at 05:12:40PM +0200, Benjamin Böhmke wrote:
> > > On Monday, May 20, 2024 16:41 CEST, Mario Limonciello <mario.limonciello@xxxxxxx> wrote:
> > >
> > > > On 5/20/2024 09:39, Christian Heusel wrote:
> > > > > On 24/05/06 02:53PM, Linux regression tracking (Thorsten Leemhuis) wrote:
> > > > >> [CCing Mario, who asked for the two suspected commits to be backported]
> > > > >>
> > > > >> On 06.05.24 14:24, Gia wrote:
> > > > >>> Hello, from 6.8.7=>6.8.8 I run into a similar problem with my Caldigit
> > > > >>> TS3 Plus Thunderbolt 3 dock.
> > > > >>>
> > > > >>> After the update I see this message on boot "xHCI host controller not
> > > > >>> responding, assume dead" and the dock is not working anymore. Kernel
> > > > >>> 6.8.7 works great.
> > > > >
> > > > > We now have some further information on the matter as somebody was kind
> > > > > enough to bisect the issue in the [Arch Linux Forums][0]:
> > > > >
> > > > > cc4c94a5f6c4 ("thunderbolt: Reset topology created by the boot firmware")
> > > > >
> > > > > This is a stable commit id, the relevant mainline commit is:
> > > > >
> > > > > 59a54c5f3dbd ("thunderbolt: Reset topology created by the boot firmware")
> > > > >
> > > > > The other reporter created [a issue][1] in our bugtracker, which I'll
> > > > > leave here just for completeness sake.
> > > > >
> > > > > Reported-by: Benjamin Böhmke <benjamin@xxxxxxxxxxx>
> > > > > Reported-by: Gia <giacomo.gio@xxxxxxxxx>
> > > > > Bisected-by: Benjamin Böhmke <benjamin@xxxxxxxxxxx>
> > > > >
> > > > > The person doing the bisection also offered to chime in here if further
> > > > > debugging is needed!
> > > > >
> > > > > Also CC'ing the Commitauthors & Subsystem Maintainers for this report.
> > > > >
> > > > > Cheers,
> > > > > Christian
> > > > >
> > > > > [0]: https://bbs.archlinux.org/viewtopic.php?pid=2172526
> > > > > [1]: https://gitlab.archlinux.org/archlinux/packaging/packages/linux/-/issues/48
> > > > >
> > > > > #regzbot introduced: 59a54c5f3dbd
> > > > > #regzbot link: https://gitlab.archlinux.org/archlinux/packaging/packages/linux/-/issues/48
> > > >
> > > > As I mentioned in my other email I would like to collate logs onto a
> > > > kernel Bugzilla. With these two cases:
> > > >
> > > > thunderbolt.dyndbg=+p
> > > > thunderbolt.dyndbg=+p thunderbolt.host_reset=false
> > > >
> > > > Also what is the value for:
> > > >
> > > > $ cat /sys/bus/thunderbolt/devices/domain0/iommu_dma_protection
> > >
> > > I attached the requested kernel logs as text files (hope this is ok).
> > > In both cases I used the stable ArchLinux kernel 6.9.1
> > >
> > > The iommu_dma_protection is both cases "1".
> > >
> > > Best Regards
> > > Benjamin
> >
> > After reset the link comes up just fine but there is one thing that I
> > noticed:
> >
> > > [ 8.225355] thunderbolt 0-0:1.1: NVM version 7.0
> > > [ 8.225360] thunderbolt 0-0:1.1: new retimer found, vendor=0x8087 device=0x15ee
> > > [ 8.226410] thunderbolt 0000:00:0d.2: current switch config:
> > > [ 8.226413] thunderbolt 0000:00:0d.2: Thunderbolt 3 Switch: 8086:15ef (Revision: 6, TB Version: 16)
> > > [ 8.226417] thunderbolt 0000:00:0d.2: Max Port Number: 13
> > > [ 8.226420] thunderbolt 0000:00:0d.2: Config:
> > > [ 8.226421] thunderbolt 0000:00:0d.2: Upstream Port Number: 0 Depth: 0 Route String: 0x0 Enabled: 0, PlugEventsDelay: 10ms
> > > [ 8.226424] thunderbolt 0000:00:0d.2: unknown1: 0x0 unknown4: 0x0
> > > [ 8.227755] iwlwifi 0000:00:14.3: Registered PHC clock: iwlwifi-PTP, with index: 0
> > > [ 8.234944] thunderbolt 0000:00:0d.2: initializing Switch at 0x1 (depth: 1, up port: 1)
> > > [ 8.246755] thunderbolt 0000:00:0d.2: acking hot plug event on 1:2
> > > [ 8.267378] thunderbolt 0000:00:0d.2: 1: reading DROM (length: 0x6d)
> > > [ 8.879296] thunderbolt 0000:00:0d.2: 1: DROM version: 1
> > > [ 8.880631] thunderbolt 0000:00:0d.2: 1: uid: 0x3d600630c86400
> > > [ 8.884540] thunderbolt 0000:00:0d.2: Port 1: 8086:15ef (Revision: 6, TB Version: 1, Type: Port (0x1))
> > > [ 8.884562] thunderbolt 0000:00:0d.2: Max hop id (in/out): 19/19
> > > [ 8.884564] thunderbolt 0000:00:0d.2: Max counters: 16
> > > [ 8.884566] thunderbolt 0000:00:0d.2: NFC Credits: 0x3c00000
> > > [ 8.884567] thunderbolt 0000:00:0d.2: Credits (total/control): 60/2
> > > [ 8.887782] thunderbolt 0000:00:0d.2: Port 2: 8086:15ef (Revision: 6, TB Version: 1, Type: Port (0x1))
> > > [ 8.887787] thunderbolt 0000:00:0d.2: Max hop id (in/out): 19/19
> > > [ 8.887789] thunderbolt 0000:00:0d.2: Max counters: 16
> > > [ 8.887791] thunderbolt 0000:00:0d.2: NFC Credits: 0x3c00000
> > > [ 8.887792] thunderbolt 0000:00:0d.2: Credits (total/control): 60/2
> > > [ 8.887794] thunderbolt 0000:00:0d.2: 1:3: disabled by eeprom
> > > [ 8.887795] thunderbolt 0000:00:0d.2: 1:4: disabled by eeprom
> > > [ 8.887796] thunderbolt 0000:00:0d.2: 1:5: disabled by eeprom
> > > [ 8.887797] thunderbolt 0000:00:0d.2: 1:6: disabled by eeprom
> > > [ 8.887798] thunderbolt 0000:00:0d.2: 1:7: disabled by eeprom
> > > [ 8.888053] thunderbolt 0000:00:0d.2: Port 8: 8086:15ef (Revision: 6, TB Version: 1, Type: PCIe (0x100102))
> > > [ 8.888056] thunderbolt 0000:00:0d.2: Max hop id (in/out): 8/8
> > > [ 8.888057] thunderbolt 0000:00:0d.2: Max counters: 2
> > > [ 8.888058] thunderbolt 0000:00:0d.2: NFC Credits: 0x800000
> > > [ 8.888059] thunderbolt 0000:00:0d.2: Credits (total/control): 8/0
> > > [ 8.888848] thunderbolt 0000:00:0d.2: Port 9: 8086:15ef (Revision: 6, TB Version: 1, Type: PCIe (0x100101))
> > > [ 8.888850] thunderbolt 0000:00:0d.2: Max hop id (in/out): 8/8
> > > [ 8.888851] thunderbolt 0000:00:0d.2: Max counters: 2
> > > [ 8.888852] thunderbolt 0000:00:0d.2: NFC Credits: 0x800000
> > > [ 8.888852] thunderbolt 0000:00:0d.2: Credits (total/control): 8/0
> > > [ 8.889379] thunderbolt 0000:00:0d.2: Port 10: 8086:15ef (Revision: 6, TB Version: 1, Type: DP/HDMI (0xe0102))
> > > [ 8.889381] thunderbolt 0000:00:0d.2: Max hop id (in/out): 9/9
> > > [ 8.889382] thunderbolt 0000:00:0d.2: Max counters: 2
> > > [ 8.889383] thunderbolt 0000:00:0d.2: NFC Credits: 0x800000
> > > [ 8.889384] thunderbolt 0000:00:0d.2: Credits (total/control): 8/0
> > > [ 8.890457] thunderbolt 0000:00:0d.2: Port 11: 8086:15ef (Revision: 6, TB Version: 1, Type: DP/HDMI (0xe0102))
> > > [ 8.890459] thunderbolt 0000:00:0d.2: Max hop id (in/out): 9/9
> > > [ 8.890460] thunderbolt 0000:00:0d.2: Max counters: 2
> > > [ 8.890461] thunderbolt 0000:00:0d.2: NFC Credits: 0x800000
> > > [ 8.890462] thunderbolt 0000:00:0d.2: Credits (total/control): 8/0
> > > [ 8.890721] thunderbolt 0000:00:0d.2: Port 12: 8086:15ea (Revision: 6, TB Version: 1, Type: Inactive (0x0))
> > > [ 8.890723] thunderbolt 0000:00:0d.2: Max hop id (in/out): 8/8
> > > [ 8.890724] thunderbolt 0000:00:0d.2: Max counters: 2
> > > [ 8.890725] thunderbolt 0000:00:0d.2: NFC Credits: 0x800000
> > > [ 8.890726] thunderbolt 0000:00:0d.2: Credits (total/control): 8/0
> > > [ 8.891534] thunderbolt 0000:00:0d.2: Port 13: 8086:15ea (Revision: 6, TB Version: 1, Type: Inactive (0x0))
> > > [ 8.891545] thunderbolt 0000:00:0d.2: Max hop id (in/out): 8/8
> > > [ 8.891551] thunderbolt 0000:00:0d.2: Max counters: 2
> > > [ 8.891557] thunderbolt 0000:00:0d.2: NFC Credits: 0x800000
> > > [ 8.891564] thunderbolt 0000:00:0d.2: Credits (total/control): 8/0
> > > [ 8.891825] thunderbolt 0000:00:0d.2: 1: current link speed 10.0 Gb/s
> >
> > Here it is 10G instead of 20G which limits the bandwidth available for
> > DP tunneling.
> >
> > ...
> >
> > > [ 9.297112] pci 0000:05:00.0: [8086:15f0] type 00 class 0x0c0330 PCIe Endpoint
> > > [ 9.297146] pci 0000:05:00.0: BAR 0 [mem 0x00000000-0x0000ffff]
> > > [ 9.297249] pci 0000:05:00.0: enabling Extended Tags
> > > [ 9.297479] pci 0000:05:00.0: supports D1 D2
> > > [ 9.297481] pci 0000:05:00.0: PME# supported from D0 D1 D2 D3hot D3cold
> > > [ 9.297717] pci 0000:05:00.0: 8.000 Gb/s available PCIe bandwidth, limited by 2.5 GT/s PCIe x4 link at 0000:00:07.0 (capable of 31.504 Gb/s with 8.0 GT/s PCIe x4 link)
> >
> > The xHCI comes up just fine though.
> >
> > > [ 9.300388] xhci_hcd 0000:05:00.0: xHCI Host Controller
> > > [ 9.300397] xhci_hcd 0000:05:00.0: new USB bus registered, assigned bus number 5
> > > [ 9.301802] xhci_hcd 0000:05:00.0: hcc params 0x200077c1 hci version 0x110 quirks 0x0000000200009810
> > > [ 9.302393] xhci_hcd 0000:05:00.0: xHCI Host Controller
> > > [ 9.302398] xhci_hcd 0000:05:00.0: new USB bus registered, assigned bus number 6
> > > [ 9.302401] xhci_hcd 0000:05:00.0: Host supports USB 3.1 Enhanced SuperSpeed
> > > [ 9.302459] usb usb5: New USB device found, idVendor=1d6b, idProduct=0002, bcdDevice= 6.09
> > > [ 9.302462] usb usb5: New USB device strings: Mfr=3, Product=2, SerialNumber=1
> > > [ 9.302465] usb usb5: Product: xHCI Host Controller
> > > [ 9.302466] usb usb5: Manufacturer: Linux 6.9.1-arch1-1 xhci-hcd
> > > [ 9.302468] usb usb5: SerialNumber: 0000:05:00.0
> > > [ 9.302783] hub 5-0:1.0: USB hub found
> > > [ 9.302794] hub 5-0:1.0: 2 ports detected
> > > [ 9.302992] usb usb6: New USB device found, idVendor=1d6b, idProduct=0003, bcdDevice= 6.09
> > > [ 9.302995] usb usb6: New USB device strings: Mfr=3, Product=2, SerialNumber=1
> > > [ 9.302997] usb usb6: Product: xHCI Host Controller
> > > [ 9.302998] usb usb6: Manufacturer: Linux 6.9.1-arch1-1 xhci-hcd
> > > [ 9.303000] usb usb6: SerialNumber: 0000:05:00.0
> > > [ 9.303557] hub 6-0:1.0: USB hub found
> > > [ 9.303567] hub 6-0:1.0: 2 ports detected
> > > [ 9.552443] usb 5-1: new high-speed USB device number 2 using xhci_hcd
> > > [ 10.130905] thunderbolt 0000:00:0d.2: 0:5 <-> 1:10 (DP): DPRX read done
> > > [ 10.131029] thunderbolt 0000:00:0d.2: 0:5 <-> 1:10 (DP): consumed bandwidth 0/17280 Mb/s
> > > [ 10.131047] thunderbolt 0000:00:0d.2: bandwidth consumption changed, re-calculating estimated bandwidth
> > > [ 10.131051] thunderbolt 0000:00:0d.2: re-calculating bandwidth estimation for group 1
> > > [ 10.131198] thunderbolt 0000:00:0d.2: bandwidth estimation for group 1 done
> > > [ 10.131206] thunderbolt 0000:00:0d.2: bandwidth re-calculation done
> > > [ 10.131212] thunderbolt 0000:00:0d.2: 1: TMU: mode change uni-directional, LowRes -> uni-directional, HiFi requested
> > > [ 10.135515] thunderbolt 0000:00:0d.2: 1: TMU: mode set to: uni-directional, HiFi
> > > [ 10.136473] thunderbolt 0000:00:0d.2: 0:6: DP IN available
> > > [ 10.136606] thunderbolt 0000:00:0d.2: 1:10: DP OUT in use
> > > [ 10.136610] thunderbolt 0000:00:0d.2: 0:6: no suitable DP OUT adapter available, not tunneling
> > > [ 10.136743] thunderbolt 0000:00:0d.2: 1:11: DP OUT resource available after hotplug
> > > [ 10.136748] thunderbolt 0000:00:0d.2: looking for DP IN <-> DP OUT pairs:
> > > [ 10.136876] thunderbolt 0000:00:0d.2: 0:5: DP IN in use
> > > [ 10.137568] thunderbolt 0000:00:0d.2: 0:6: DP IN available
> > > [ 10.137687] thunderbolt 0000:00:0d.2: 1:10: DP OUT in use
> > > [ 10.137820] thunderbolt 0000:00:0d.2: 1:11: DP OUT available
> > > [ 10.139280] thunderbolt 0000:00:0d.2: 0: allocated DP resource for port 6
> > > [ 10.139286] thunderbolt 0000:00:0d.2: 0:6: attached to bandwidth group 1
> > > [ 10.139694] thunderbolt 0000:00:0d.2: 0:1: link maximum bandwidth 18000/18000 Mb/s
> > > [ 10.140680] thunderbolt 0000:00:0d.2: 0:5 <-> 1:10 (DP): DPRX read done
> > > [ 10.140829] thunderbolt 0000:00:0d.2: 0:5 <-> 1:10 (DP): consumed bandwidth 0/17280 Mb/s
> > > [ 10.140963] thunderbolt 0000:00:0d.2: 1:1: link maximum bandwidth 18000/18000 Mb/s
> > > [ 10.141892] thunderbolt 0000:00:0d.2: 0:5 <-> 1:10 (DP): DPRX read done
> > > [ 10.142027] thunderbolt 0000:00:0d.2: 0:5 <-> 1:10 (DP): consumed bandwidth 0/17280 Mb/s
> > > [ 10.142033] thunderbolt 0000:00:0d.2: available bandwidth for new DP tunnel 18000/720 Mb/s
> > > [ 10.142052] thunderbolt 0000:00:0d.2: 0:6 <-> 1:11 (DP): activating
> > > [ 10.143353] thunderbolt 0000:00:0d.2: 0:6 <-> 1:11 (DP): DP IN maximum supported bandwidth 8100 Mb/s x4 = 25920 Mb/s
> > > [ 10.143360] thunderbolt 0000:00:0d.2: 0:6 <-> 1:11 (DP): DP OUT maximum supported bandwidth 5400 Mb/s x4 = 17280 Mb/s
> > > [ 10.143366] thunderbolt 0000:00:0d.2: 0:6 <-> 1:11 (DP): not enough bandwidth
> > > [ 10.143371] thunderbolt 0000:00:0d.2: 1:11: DP tunnel activation failed, aborting
> >
> > However, the second DP tunnel fails because of no bandwidth.
> >
> > > [ 10.143489] thunderbolt 0000:00:0d.2: 0:6: detached from bandwidth group 1
> > > [ 10.144883] thunderbolt 0000:00:0d.2: 0: released DP resource for port 6
> > > [ 14.902955] usb 5-1: unable to get BOS descriptor set
> > > [ 14.906143] usb 5-1: New USB device found, idVendor=2188, idProduct=0610, bcdDevice=70.42
> > > [ 14.906167] usb 5-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
> > > [ 14.906175] usb 5-1: Product: USB2.1 Hub
> > > [ 14.906183] usb 5-1: Manufacturer: CalDigit, Inc.
> > > [ 14.908660] hub 5-1:1.0: USB hub found
> > > [ 14.909135] hub 5-1:1.0: 4 ports detected
> > > [ 15.026182] usb 6-1: new SuperSpeed Plus Gen 2x1 USB device number 2 using xhci_hcd
> > > [ 15.050199] usb 6-1: New USB device found, idVendor=2188, idProduct=0625, bcdDevice=70.42
> > > [ 15.050223] usb 6-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
> > > [ 15.050231] usb 6-1: Product: USB3.1 Gen2 Hub
> > > [ 15.050237] usb 6-1: Manufacturer: CalDigit, Inc.
> > > [ 15.053712] hub 6-1:1.0: USB hub found
> > > [ 15.054279] hub 6-1:1.0: 4 ports detected
> > > [ 15.215877] usb 5-1.4: new high-speed USB device number 3 using xhci_hcd
> > > [ 15.333676] usb 5-1.4: New USB device found, idVendor=2188, idProduct=0611, bcdDevice=93.06
> > > [ 15.333703] usb 5-1.4: New USB device strings: Mfr=1, Product=2, SerialNumber=0
> > > [ 15.333711] usb 5-1.4: Product: USB2.1 Hub
> > > [ 15.333718] usb 5-1.4: Manufacturer: CalDigit, Inc.
> > > [ 15.336484] hub 5-1.4:1.0: USB hub found
> > > [ 15.336797] hub 5-1.4:1.0: 4 ports detected
> > > [ 15.402943] usb 6-1.1: new SuperSpeed USB device number 3 using xhci_hcd
> > > [ 15.425589] usb 6-1.1: New USB device found, idVendor=2188, idProduct=0754, bcdDevice= 0.06
> > > [ 15.425615] usb 6-1.1: New USB device strings: Mfr=3, Product=4, SerialNumber=2
> > > [ 15.425623] usb 6-1.1: Product: USB-C Pro Card Reader
> > > [ 15.425691] usb 6-1.1: Manufacturer: CalDigit
> > > [ 15.425697] usb 6-1.1: SerialNumber: 000000000006
> > > [ 15.432231] usb-storage 6-1.1:1.0: USB Mass Storage device detected
> > > [ 15.433690] scsi host0: usb-storage 6-1.1:1.0
> > > [ 15.506218] usb 6-1.4: new SuperSpeed USB device number 4 using xhci_hcd
> > > [ 15.528220] usb 6-1.4: New USB device found, idVendor=2188, idProduct=0620, bcdDevice=93.06
> > > [ 15.528237] usb 6-1.4: New USB device strings: Mfr=1, Product=2, SerialNumber=0
> > > [ 15.528241] usb 6-1.4: Product: USB3.1 Gen1 Hub
> > > [ 15.528244] usb 6-1.4: Manufacturer: CalDigit, Inc.
> > > [ 15.531198] hub 6-1.4:1.0: USB hub found
> > > [ 15.531506] hub 6-1.4:1.0: 4 ports detected
> > > [ 15.649217] usb 5-1.4.1: new high-speed USB device number 4 using xhci_hcd
> > > [ 15.989548] usb 6-1.4.4: new SuperSpeed USB device number 5 using xhci_hcd
> > > [ 16.007996] usb 6-1.4.4: New USB device found, idVendor=0bda, idProduct=8153, bcdDevice=31.00
> > > [ 16.008021] usb 6-1.4.4: New USB device strings: Mfr=1, Product=2, SerialNumber=6
> > > [ 16.008029] usb 6-1.4.4: Product: USB 10/100/1000 LAN
> > > [ 16.008035] usb 6-1.4.4: Manufacturer: Realtek
> > > [ 16.008040] usb 6-1.4.4: SerialNumber: 001001000
> > > [ 16.090287] r8152-cfgselector 6-1.4.4: reset SuperSpeed USB device number 5 using xhci_hcd
> > > [ 16.136796] r8152 6-1.4.4:1.0: load rtl8153b-2 v2 04/27/23 successfully
> > > [ 16.171430] r8152 6-1.4.4:1.0 eth0: v1.12.13
> > > [ 16.209513] r8152 6-1.4.4:1.0 enp5s0u1u4u4: renamed from eth0
> > > [ 16.453330] scsi 0:0:0:0: Direct-Access CalDigit SD Card Reader 0006 PQ: 0 ANSI: 6
> > > [ 16.454420] sd 0:0:0:0: Attached scsi generic sg0 type 0
> > > [ 16.455908] sd 0:0:0:0: [sda] Media removed, stopped polling
> > > [ 16.457173] sd 0:0:0:0: [sda] Attached SCSI removable disk
> > > [ 16.497559] usb 5-1.4.1: New USB device found, idVendor=2188, idProduct=4042, bcdDevice= 0.06
> > > [ 16.497567] usb 5-1.4.1: New USB device strings: Mfr=3, Product=1, SerialNumber=0
> > > [ 16.497570] usb 5-1.4.1: Product: CalDigit USB-C Pro Audio
> > > [ 16.497572] usb 5-1.4.1: Manufacturer: CalDigit Inc.
> > > [ 16.920216] ucsi_acpi USBC000:00: possible UCSI driver bug 1
> > > [ 17.494492] input: CalDigit Inc. CalDigit USB-C Pro Audio as /devices/pci0000:00/0000:00:07.0/0000:03:00.0/0000:04:02.0/0000:05:00.0/usb5/5-1/5-1.4/5-1.4.1/5-1.4.1:1.3/0003:2188:4042.0005/input/input20
> > > [ 17.550258] hid-generic 0003:2188:4042.0005: input,hidraw2: USB HID v1.11 Device [CalDigit Inc. CalDigit USB-C Pro Audio] on usb-0000:05:00.0-1.4.1/input3
> > > [ 19.609816] r8152 6-1.4.4:1.0 enp5s0u1u4u4: carrier on
> >
> > All the USB devices seem to work fine (assuming I read this right).
>
> To keep the log small I unplugged all USB devices from the dock.
> But even if connected I don't have issues with them.
>
> >
> > There is the DP tunneling limitation but other than that how the dock
> > does not work? At least reading this log everything else seems to be
> > fine except the second monitor?
>
> Exactly only the second monitor is/was not working.
>
> >
> > Now it is interesting why the link is only 20G and not 40G. I do have
> > this same device and it gets the link up as 40G just fine:
> >
> > [ 17.867868] thunderbolt 0000:00:0d.2: 1: current link speed 20.0 Gb/s
> > [ 17.867869] thunderbolt 0000:00:0d.2: 1: current link width symmetric, single lane
> > [ 17.868437] thunderbolt 0000:00:0d.2: 0:1: total credits changed 120 -> 60
> > [ 17.868625] thunderbolt 0000:00:0d.2: 0:2: total credits changed 0 -> 60
> > [ 17.872472] thunderbolt 0000:00:0d.2: 1: TMU: current mode: bi-directional, HiFi
> > [ 17.872608] thunderbolt 0-1: new device found, vendor=0x3d device=0x11
> > [ 17.879102] thunderbolt 0-1: CalDigit, Inc. TS3 Plus
> >
>
> My dock is a little different model (see https://www.caldigit.com/usb-c-pro-dock/)
> I don't have a CalDigit TS3 Plus.
>
> > Do you use a Thunderbolt cable or some regular type-C one? There is the
> > lightning symbol on the connector when it is Thunderbolt one.
>
> The dock was connected with a Thunderbolt cable, that I used for a couple of years without any issues.
> Based on the hint I replaced the cable and the issue is now gone for me.
>
> I still don't understand why this happened as it was working great for years and is still working with kernels 6.8.7 or older.
> But nevertheless sorry if I wasted time of anyone because of broken hardware.
>
> Best Regards
> Benjamin
>