@Andre Plötze As described in the bug report I have observed the following that make me think that a hardware issue can be excluded:
> All above modes of connection work as expected with the same laptop, dock, > and display on Windows 10 (installed as dual boot along side Ubuntu). > All above modes of connection also work as expected with an older laptop > (ThinkPad T470s - Ubuntu 20.04 - kernel 5.4.0), and the same dock and display. > This leads me to believe that this is not a hardware issue. My main operating system is Ubuntu and I only use Windows on rare occasion, so I do not have months of usage under Windows that I can report on. However, whenever I test with the T14s on Windows the monitor connection through the dock works immediately and reliably, while it never works on Linux with the T14s. So, even if there was an underlying hardware issue somewhere, it would still seem that there is a software issue as well which makes me not encounter any issues on Windows, while consistently observing an issue on Linux. You report that you are using Ubuntu 20.04 LTS, I am using Ubuntu 20.10. The corresponding difference in kernel may well be relevant here. Also, just to be sure, do you have the same laptop model (ThinkPad T14s Gen 1 - AMD Ryzen 7 PRO 4750U) or a different one? -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1908139 Title: ThinkPad T14s external display not working on ThinkPad USB-C Dock Gen2 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1908139/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
