https://bugzilla.suse.com/show_bug.cgi?id=1225881 Bug ID: 1225881 Summary: Whole system hangs up / freezes when Input switched on external monitor on Thinkpad T14 G2 AMD with Ultra Dock Classification: openSUSE Product: openSUSE Tumbleweed Version: Current Hardware: x86-64 OS: openSUSE Tumbleweed Status: NEW Severity: Critical Priority: P5 - None Component: KDE Workspace (Plasma) Assignee: opensuse-kde-bugs@opensuse.org Reporter: suse@souji.quest QA Contact: qa-bugs@suse.de Target Milestone: --- Found By: --- Blocker: --- User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 Safari/537.36 Build Identifier: So, this bug started happening very recently, all was fine before. I use a T14G2 AMD as my 'secondary device' alongside my desktop, and have it set up to have the Ultra dock connect to alternate Inputs of my screen. If I want to switch from desktop to laptop, I switch the monitor's input, and switch my USB KVM over to the laptop for mouse/keyboard. This includes one over HDMI, and one over DisplayPort. What started happening, is that sometimes, when switching over, specifically when changing the monitor input, the whole system freezes up and gets unresponsive; this is only fixed with a hard power down (5s press). It doesn't always happen immediately, but most often does if the input was switched to another device for a longer time (>10 minutes). It doesn't matter if the laptop screen is active or not - the moment I switch the monitor input, the system locks up - I verified this by leaving the laptop's screen active. Mouse moved, switch monitor input to output the KDE system, system frozen. Checking journalctl I get no even remotely relevant messages - the system itself still appears to be running up to the point of the hang - no journalctl entries afterwards. Can't switch to terminal only mode (ctrl+alt+F keys) either, so it's not just KDE that's hanging. Reproducible: Always Steps to Reproduce: 1. Start laptop system with external monitors attached 2. Switch away monitor inputs for ~10-15 minutes 3. Switch back to inputs to laptop Unclear if related to docking station (Thinkpad Ultra https://support.lenovo.com/us/en/solutions/pd500173-thinkpad-ultra-docking-s... ) Actual Results: System becomes unresponsive Expected Results: System continues working normally -- You are receiving this mail because: You are on the CC list for the bug.