[Bug 52508] New: EnumDisplayDevices() fails in obscure ways on 32-bit arch when 64-bit Vulkan is present but 32-bit is missing

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=52508

Bug ID: 52508
           Summary: EnumDisplayDevices() fails in obscure ways on 32-bit
                    arch when 64-bit Vulkan is present but 32-bit is
                    missing
           Product: Wine
           Version: 7.1
          Hardware: x86-64
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: user32
          Assignee: [e-mail]
          Reporter: [e-mail]
                CC: [e-mail], [e-mail]
      Distribution: ---

FWIW, this is easy to trigger by running 32-bit ddraw:ddraw1.

I'm fine with calling this case "user error", but the problem is, it's not that
hard to be missing Vulkan drivers for one architecture, while debugging this
took way too long. It'd be nice to at least have some way of printing a
message.

The basic problem is that when Vulkan is present we retrieve the PCI IDs from
it, but when it's absent we set them to zero. As a result we end up creating
two different sets of registry entries, but only the 64-bit one gets populated
via initialize_display_settings(). EnumDisplayDevices() tries to access it and
finds the GPU entries empty.

This does lead me to ask: can we avoid querying GPUs in each process? Can we
just let explorer.exe manage them and get our information from there?

CC'ing Jacek and Zhiyi as both having worked closely with this code.