https://bugs.freedesktop.org/show_bug.cgi?id=97305
--- Comment #8 from Marek Olšák maraeo@gmail.com ---
Nonetheless given that AMD always sets it to 256 ...
Not true. The Mesa driver is also developed by us. Nicolai and me work for AMD. There is also the Vulkan driver which returns "1 byte" for the texture buffer alignment.