Well, in the case of a Lenovo 4338, a quick google shows it is based on the SMSC2517, (https://joes-tech-blog.blogspot.com/2017/09/whats-inside- lenovo-docking-station-for.html) and well, another quick google show SMSC was aquired by Microchip, and after a third Google, I can tell you the USB controller chip and see that it even has published suspend- related errata that they do not plan on fixing that was discovered in Windows 8 days.
Some excerpts below: Module 1: End of User Impacts: Port might fail to go into SUSPEND. Solution: This will not be addressed in a future version of the device. Module 2: End of User Impacts: Device might not enumerate. Solution: Use external power on reset circuit (for example, reset circuit with MAX809S(V2.9V) voltage supervisor) https://ww1.microchip.com/downloads/en/DeviceDoc/80000628A.pdf Likely these quirks are not being backported into the drivers, to workaround in software for certain scenarios, and so are being stumbled upon with more advanced multi-device scenarios now supported in newer Ubuntu versions. I would isolate the dock showing that the scenario works with a different port replicator/chip, and then either a) use the other port replicator b) reach out to the maintainer of the driver, see if you can give him some hardware, a reproducable scenario, you might be able to get a fix c) find a developer for hire, do the same, upstream a patch -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1841826 Title: Going to sleep instead of logging in while lid closed & external display To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-settings-daemon/+bug/1841826/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
