hirsuit kernel fails to detect monitor plugged into USBC thunderbolt socket

[Philip Armstrong]

On upgrade to hirsuit hippo, my Dell 9360 no longer detects a monitor plugged into the thunderbolt usbc socket. If I reboot with the latest kernel from Ubuntu 20.10 (version 5.8.0-50) it works perfectly, detecting the monitor from kernel boot.

I have tried both a thunderbolt cable, where usb devices plugged into the monitor are detected, but the monitor itself is not, and a usbc<->displayport adaptor that puts the socket straight into DP alternate mode. Neither work in 21.04.

Happy to try and debug this, but not sure where to start!

ProblemType: Bug
DistroRelease: Ubuntu 21.04
Package: linux-image-5.11.0-16-generic 5.11.0-16.17
ProcVersionSignature: Ubuntu 5.11.0-16.17-generic 5.11.12
Uname: Linux 5.11.0-16-generic x86_64
ApportVersion: 2.20.11-0ubuntu65
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: phil 3089 F.... pulseaudio
CasperMD5CheckResult: unknown
CurrentDesktop: GNOME
Date: Thu Apr 22 20:11:35 2021
HibernationDevice: RESUME=UUID=8b5c4d3a-8f9a-420d-a564-3d58a0c0502b
InstallationDate: Installed on 2018-07-19 (1008 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
Lsusb:
 Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
 Bus 001 Device 003: ID 0c45:670c Microdia Integrated Webcam HD
 Bus 001 Device 002: ID 0cf3:e300 Qualcomm Atheros Communications QCA61x4 Bluetooth 4.0
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: Dell Inc. XPS 13 9360
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.11.0-16-generic root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-5.11.0-16-generic N/A
 linux-backports-modules-5.11.0-16-generic N/A
 linux-firmware 1.197
SourcePackage: linux
UpgradeStatus: Upgraded to hirsute on 2021-04-22 (0 days ago)
dmi.bios.date: 03/09/2021
dmi.bios.release: 2.15
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 2.15.1
dmi.board.name: 0PVG6D
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 9
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvr2.15.1:bd03/09/2021:br2.15:svnDellInc.:pnXPS139360:pvr:rvnDellInc.:rn0PVG6D:rvrA00:cvnDellInc.:ct9:cvr:
dmi.product.family: XPS
dmi.product.name: XPS 13 9360
dmi.product.sku: 082A
dmi.sys.vendor: Dell Inc.
mtime.conffile..etc.apport.crashdb.conf: 2019-04-29T12:11:49.292007

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This change was made by a bot.

[Kai-Heng Feng (kaihengfeng)]

Please test latest drm-tip kernel:
https://kernel.ubuntu.com/~kernel-ppa/mainline/drm-tip/current/

[Philip Armstrong (phil-ubuntu)]

Annoyingly, I have to report that this morning the display in question worked fine with both the latest stable hirsuit kernel (5.11.0-17-generic) and the version I reported the bug for (5.11.0-16-generic).

If I can find a way to reproduce it reliably, then I'll re-open this bug, but for the moment, maybe close as non-reproducible?

[Kai-Heng Feng (kaihengfeng)]

Sure, thanks for the update.

[Launchpad Janitor (janitor)]

[Expired for linux (Ubuntu) because there has been no activity for 60 days.]