discrete/hybird gpu on elementary/fedora
The open-source AMDGPU/radeonsi drivers (the driver naming convention is a bit absurd) support the TOPAZ chipset and should work with your R7 M440; both Ubuntu-derived versions (such as Elementary) and Fedora will support it (in all likelihood) out of the box without any setup required on your side. It should also self-update.
As for the hybrid graphics, there is support, and switching between the igpu and the dgpu can be done both manually and automaticall. See here for details: https://wiki.archlinux.org/index.php/PRIME#PRIME_GPU_offloading
Arch seems to have the best community with regards to this problem, and it's amongst the most popular distributions out there.
P.S. There is also a pro binary driver supplied by AMD: http://support.amd.com/en-us/kb-articles/Pages/AMD-Radeon-GPU-PRO-Linux-Beta-Driver–Release-Notes.aspx. Do not install these; they are fidgety at best.
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