Comment # 169 on bug 111481 from Marko Popovic

(In reply to L.S.S. from comment #168)
> For the 5.4 kernel, I'm running 5.4-rc2 (from official Manjaro repo). Not
> sure when Manjaro Stable will receive its next update regarding kernels...

You can always compile Kernel-git but Manjaro should be decently fast to
provide 5.4+ RC series.