There are a limited number of supported graphics cards for Amithlon. NVidia, Matrox, ATI and even Voodoo. Some better than others, though it still revolves around older linux 2.4 framebuffer support. Going through the kernel and gathering what we can find, this is the support breakdown for acceleration with each card type. This is information based on kernel 4.
Acceleration options defined in the kernel:
(1)FILL_RECT
(2)COPY_RECT
(3)BLIT_TEMP
(4)COPY_RECT_COMPLETE
(5)DRAW_LINE
nvidia:
(1)FILL_RECT
(2)COPY_RECT
(3)BLIT_TEMP
(4)COPY_RECT_COMPLETE
(5)DRAW_LINE
matrox:
(1)FILL_RECT
(2)COPY_RECT
(3)BLIT_TEMP
(5)COPY_RECT_COMPLETE
radeon:
(1)FILL_RECT
(2)COPY_RECT
(4)COPY_RECT_COMPLETE
(5)DRAW_LINE
voodoo:
(2)COPY_RECT
We can definitely see that overall nVidia has the most enabled acceleration functions with the Matrox and Radeon cards each dropping a different function. The Voodoo is the least supported and would be close to standard VESA framebuffer. I’ve not had a functioning PCI Radeon card, I believe AGP cards are the ones that work in Amithlon (based off a few laptops with AGP Radeon cards known to work). Matrox has both PCI and PCIe cards that work and nVidia has both AGP and PCI cards working. I have no feedback from anyone using a Voodoo card with Amithlon.
Still working through what we can, hopefully gaining more insight in to how Amithlon functions with as much specifics/details as possible.