These improvements are for MESA, by an open source developer for Valve. So not in the AMD driver itself. Older AMD cards do well on linux, because AMD open sourced the driver and incorporated it in the kernel. My AMD experience on linux thus far has been that it just works. Valve is spending a lot of resources on improving the graphics stack on linux.
And this is while AMD is trying to abandon support for it and RDNA1 in Windows.
These improvements are for MESA, by an open source developer for Valve. So not in the AMD driver itself. Older AMD cards do well on linux, because AMD open sourced the driver and incorporated it in the kernel. My AMD experience on linux thus far has been that it just works. Valve is spending a lot of resources on improving the graphics stack on linux.