Niklas KorzI was wondering why https://vulkan.gpuinfo.org/displayextensiondetail.php?extension=VK_EXT_swapchain_colorspace reports zero support on Linux, eventhough it has been supported on Mesa for a year and recently been added to Nvidia too. Then I noticed that all uploaded Linux reports generally state no present support for any queue families. I wonder if that's related?
Oh there's an upstream issue already, maybe I can fix it? 
https://github.com/SaschaWillems/VulkanCapsViewer/issues/216
Seeing that no other distribution reports presentable queue families, maybe this can be fixed in the CMakeLists so everyone gets to enjoy testing of Wayland surfaces.(the original question that started the thread was by the way unrelated after all; the extension in question is an instance extension on Linux and a device extension on Windows, so I was confused where to look for it)
Fix for nixpkgs and an update:
vulkan-caps-viewer: 4.03 -> 4.11, fix license and move to pkgs/by-name by niklaskorz · Pull Request #500097 · NixOS/nixpkgs
Most notable changes of this PR: Qt6 Fix present support check for queue families. The derivation was previously lacking the qmake defines to correctly create the testing surface on Wayland and X1...