Thunderbolt dock no longer works

I'm using Lubuntu 20.04 on Dell XPS 13 9360. Somehow thunderbolt stopped working. I've attached the relevant output from /var/syslog. I'm using 5.4.0-52-generic. I've updated all my firmware through fwupdmgr.

Briefly, the kernel complains
kernel: pci 0000:01:00.0: BAR 13: no space for [io size 0x3000]
kernel: pci 0000:01:00.0: BAR 13: failed to assign [io size 0x3000]

then
kernel: usb 3-1.3: config 1 has no interfaces?

then

kernel: xhci_hcd 0000:39:00.0: xHCI host controller not responding, assume dead
kernel: r8152 4-1.4:1.0 enxd481d70b2831: Stop submitting intr, status -108
kernel: xhci_hcd 0000:39:00.0: HC died; cleaning up

then
kernel: xhci_hcd 0000:39:00.0: Host halt failed, -19
kernel: xhci_hcd 0000:39:00.0: Host not accessible, reset failed.

then

kernel: pcieport 0000:00:1c.0: AER: PCIe Bus Error: severity=Corrected, type=Physical Layer, (Receiver ID)
kernel: pcieport 0000:00:1c.0: AER: device [8086:9d10] error status/mask=00000001/00002000
kernel: pcieport 0000:00:1c.0: AER: [ 0] RxErr

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: linux-firmware 1.187.3
ProcVersionSignature: Ubuntu 5.4.0-52.57-generic 5.4.65
Uname: Linux 5.4.0-52-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.10
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: albert 820 F.... pulseaudio
CasperMD5CheckResult: skip
CurrentDesktop: LXQt
Date: Wed Nov 4 16:07:31 2020
Dependencies:

InstallationDate: Installed on 2020-05-11 (176 days ago)
InstallationMedia: Lubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
Lsusb:
 Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
 Bus 001 Device 004: ID 0bda:568b Realtek Semiconductor Corp. Integrated_Webcam_HD
 Bus 001 Device 003: ID 0cf3:e300 Qualcomm Atheros Communications
 Bus 001 Device 002: ID 046d:c077 Logitech, Inc. M105 Optical Mouse
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: Dell Inc. XPS 13 9360
PackageArchitecture: all
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.4.0-52-generic root=UUID=95de7ebe-d429-45d7-9548-0d5af627a560 ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-5.4.0-52-generic N/A
 linux-backports-modules-5.4.0-52-generic N/A
 linux-firmware 1.187.3
SourcePackage: linux-firmware
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 07/13/2020
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 2.14.2
dmi.board.name: 0T3FTF
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 9
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvr2.14.2:bd07/13/2020:svnDellInc.:pnXPS139360:pvr:rvnDellInc.:rn0T3FTF:rvrA00:cvnDellInc.:ct9:cvr:
dmi.product.family: XPS
dmi.product.name: XPS 13 9360
dmi.product.sku: 075B
dmi.sys.vendor: Dell Inc.