My desktop has a Ryzen 5 2400G APU and VRAM is allocated from main memory as set by the UEFI. I wanted to know its proper capacity, so I ran the following command to find out the current VRAM usage.
$ glxinfo | egrep 'free memory'
VBO free memory - total: 486 MB, largest block: 486 MB
Texture free memory - total: 486 MB, largest block: 486 MB
Renderbuffer free memory - total: 486 MB, largest block: 486 MB
These values indicate free VRAM space, right?