Now that I tried removing the workaround again, it looks like things still work for me. So now at least one working combination that does not trigger this bug looks like this: - Fedora 28 - kernel 4.16.14-300.fc28.x86_64 - mesa 18.0.2 - x-plane 11.21 Compared to my earlier report, all the bits have changed their versions. Does anyone have any idea on if this was addressed in the driver stack or if it is actually X-plane behaving nicer?