Gnome shell freezes when plugging in external display

[Jesko]

I have a Lenovo Thinkpad X1 Yoga with Ubuntu 22.04 and a dock for it. If the laptop is in the dock and I plug a monitor into the display port gnome shell freezes. When this happens I can still go to other ttys. This exact setup used to work for Ubuntu 20.04 so I assume it must be connected to wayland somehow.

lsb_release -rd
Description: Ubuntu 22.04 LTS
Release: 22.04

apt-cache policy gnome-shell
gnome-shell:
  Installed: 42.0-2ubuntu1
  Candidate: 42.0-2ubuntu1

[Daniel van Vugt (vanvugt)]

Thanks for the bug report. Next time a freeze happens please:

1. Wait 10 seconds.

2. Reboot.

3. Run:

   journalctl -b-1 > prevboot.txt

4. Attach the resulting text file here.

5. Also check for crashes by following
https://wiki.ubuntu.com/Bugs/Responses#Missing_a_crash_report_or_having_a_.crash_attachment

6. Maybe also subscribe to bug 1970495.

[Jesko (jeskowastaken)]

No crash report is produced

[Daniel van Vugt (vanvugt)]

Thanks. These messages look the most suspicious to me:

Mai 04 11:04:24 mamba kernel: i915 0000:00:02.0: [drm] *ERROR* mstb 00000000caa481c4 port 1: DPCD read on addr 0x4b0 for 1 bytes NAKed
Mai 04 11:04:24 mamba kernel: i915 0000:00:02.0: [drm] *ERROR* mstb 00000000caa481c4 port 2: DPCD read on addr 0x4b0 for 1 bytes NAKed
Mai 04 11:04:27 mamba kernel: xhci_hcd 0000:2d:00.0: xHC error in resume, USBSTS 0x411, Reinit
Mai 04 11:04:27 mamba kernel: usb usb3: root hub lost power or was reset
Mai 04 11:04:27 mamba kernel: usb usb4: root hub lost power or was reset
...
Mai 04 11:04:27 mamba kernel: usb 4-2: Disable of device-initiated U1 failed.
Mai 04 11:04:27 mamba kernel: usb 4-2: Disable of device-initiated U2 failed.
Mai 04 11:04:27 mamba kernel: usb 4-2: reset SuperSpeed USB device number 2 using xhci_hcd
Mai 04 11:04:28 mamba kernel: usb 4-2.4: Disable of device-initiated U1 failed.
Mai 04 11:04:28 mamba kernel: usb 4-2.4: Disable of device-initiated U2 failed.
Mai 04 11:04:28 mamba kernel: usb 4-2.4: reset SuperSpeed USB device number 3 using xhci_hcd
Mai 04 11:04:31 mamba kernel: i915 0000:00:02.0: [drm] *ERROR* mstb 00000000caa481c4 port 1: DPCD read on addr 0x4b0 for 1 bytes NAKed
Mai 04 11:04:31 mamba kernel: i915 0000:00:02.0: [drm] *ERROR* mstb 00000000caa481c4 port 2: DPCD read on addr 0x4b0 for 1 bytes NAKed

It's certainly possible that if gnome-shell is expecting a working monitor then such kernel/hardware/dock/firmware bugs might make it appear to freeze, as it waits forever.

[Daniel van Vugt (vanvugt)]

Sounds like bug 1926809.

[Daniel van Vugt (vanvugt)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. This particular bug has already been reported and is a duplicate of bug 1970495, so it is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Feel free to continue to report any other bugs you may find.