I have read your posts 38 39 and I have an AMD APU
I am not using flwm nor an xorg file and glxgears fails for me. Now it may be my desktop, a private update to icewm.
Can you exit FLWM to prompt and report any error messages please.
I am currently successfully using TC14 with 3D acceleration. Using TC14 kernel ver. 6.1 I have no choice but to use the radeon console, and xf86-video-ati in Xorg. So for kernel/dri I load only radeon, not amdgpu And I
use the old Xorg-3D acceleration from TC13 , because in tc14 is a BUG, even for radeonsi. So talk about AMDGPU is closed (for me) in TC14 for my 8 years old APU: AMD A6-6310 APU with AMD Radeon R4 Graphics (family: 0x16).
IF you use another kernel (which has CONFIG_DRM_AMDGPU_{SI, CK} =yes in kernel config), like Alpine-Linux kernel has,
and also on grub you give the proper parameters for SI/CIK, then you may have success in Xorg-3D with xf86-video-amdgpu. BUT, all new 3D drivers are (in almost all distributions) linked with LLVM15+ -libs (a monstrous 125 MB size), instead of llvm13 in TC14.