According to this Wikipedia article, some AMD graphics chips have open source drivers. Better said, there are open source drivers for them.
It is not clear from the article, though, if Radeon R5 M430 falls in this category and has an open source Linux driver developed for it or not. Can anyone help please?
As a side note, as far as I know Intel graphics are now completely available to the FOSS society to write drivers for, NVidia does not show any interest in helping write open source drivers (see the above article and also this video), but AMD drivers are partially open source.