I just installed Alpine Linux, did 'setup-xorg-base', which installs the base Xorg packages, also installed xinit and openbox. After adjusting my .xinitrc file properly, I ran xinit, and startx just to make sure.
Instead of launching Openbox, xinit gives me some output along with the titular error. All the rest of the input is just telling me to go to the wiki, no diagnostics or anything.
According to neofetch, my laptop model is an "HP 255 G6 Notebook PC" and my GPU is an "AMD ATI Radeon R2/R3/R4/R5 Graphics".