I *did* see those messages when I was initially debugging the problem. This is from dmesg in one of the logs I made:
``` [ 20.525519] amdgpu 0000:07:00.0: [drm] *ERROR* mstb 00000000f21f0a30 port 1: DPCD read on addr 0x4b0 for 1 bytes NAKed [ 20.570355] amdgpu 0000:07:00.0: [drm] *ERROR* mstb 00000000f21f0a30 port 2: DPCD read on addr 0x4b0 for 1 bytes NAKed [ 20.614750] amdgpu 0000:07:00.0: [drm] *ERROR* mstb 00000000f21f0a30 port 3: DPCD read on addr 0x4b0 for 1 bytes NAKed ``` At the time, I tried MUTTER_DEBUG_ENABLE_ATOMIC_KMS=0 and didn't see any change. The only thing that worked was switching the monitors from DisplayPort to HDMI on the dock. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1970495 Title: Window manager freezes when plugging in USB-C dock with external monitor. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1970495/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
