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Tasklist

FS#79144 - [systemd] USB devices connected to a USB hub do not work unless they are replugged

Attached to Project: Arch Linux
Opened by nl6720 (nl6720) - Wednesday, 19 July 2023, 13:31 GMT
Last edited by Toolybird (Toolybird) - Wednesday, 19 July 2023, 22:30 GMT
Task Type Bug Report
Category Packages: Testing
Status Waiting on Response
Assigned To Christian Hesse (eworm)
Architecture All
Severity Medium
Priority Normal
Reported Version
Due in Version Undecided
Due Date Undecided
Percent Complete 0%
Votes 1
Private No

Details

Description:
After updating systemd from 253.6-2 to 254rc2-2, USB devices attached to my monitor's USB hub do not work in Plasma wayland session unless I unplug and replug them (or the USB/Thunderbolt3 cable connecting the monitor to the PC). Since I attach my mouse and keyboard to the monitor's USB ports, this can be annoying.
The USB devices work fine in a Plasma Xorg session, only the wayland session is affected.

systemd 253.6-2 doesn't have this issue.


In systemd-254rc2-2.plasma_wayland.bad.log I unplugged the keyboard at 12:23:06.


Additional info:
* package version(s)
* config and/or log files etc.
* link to upstream bug report, if any
systemd 254rc2-2
systemd-libs 254rc2-2
systemd-resolvconf 254rc2-2
systemd-sysvcompat 254rc2-2
lib32-systemd 254rc2-1
lightdm 1:1.32.0-4
web-greeter 3.5.2-2
plasma-wayland-session 5.27.6-2


Steps to reproduce:
Start a plasmawayland session.
   systemd-254rc2-2.plasma_wayla... (240.8 KiB)
   systemd-254rc2-2.plasma_xorg.... (239 KiB)
   systemd-253.6-2.plasma_waylan... (232.9 KiB)
This task depends upon

Comment by nl6720 (nl6720) - Wednesday, 19 July 2023, 15:58 GMT
Here's some `udevadm info` output. "replug" is after unplugging and replugging the USB/Thunderbolt3 cable connecting to the PC.
   udevadm_info.253.6-2.good.log (98 KiB)
   udevadm_info.254rc2-2.bad.log (100.9 KiB)
   udevadm_info.254rc2-2.replug.... (100.6 KiB)
Comment by Toolybird (Toolybird) - Wednesday, 19 July 2023, 22:30 GMT
This looks like a hardware specific problem. The description implies a systemd regression (but obviously Plasma wayland could be at fault too). It should therefore be reported upstream because it doesn't appear to be an Arch packaging bug. But the offending upstream systemd commit should first be identified by performing a git bisection. But before doing that, it's probably worthwhile trawling the upstream udev issues [1]

I personally have performed git bisection on systemd on 2 separate occasions in recent months and it wasn't too painful :)

[1] https://github.com/systemd/systemd/labels/udev
Comment by nl6720 (nl6720) - Thursday, 20 July 2023, 01:40 GMT
I tried to bisect it a few days ago, but I didn't get very far. I got stuck in a group of commits where the plasma session would simply die upon launch. After a couple of skips, I simply gave up.

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