Thankyou. Linking against CoreGraphics causes a device to be found. clang -framework CoreGraphics -framework Metal -framework Foundation objc.m -o objc ./objc default device: AMD Radeon Pro 5500 XT all devices: AMD Radeon Pro 5500 XT

I have noticed Audio on my iMac (27-inch 2020) Big Sur (now up to 11.6 and below) has produced audio popping and distortion noises occasionally. When the system gets into this state Skype just hangs , and forcequitting and restarting it just brings it back to a point where it hangs upon needing to use audio. killall -9 coreaudiod resolves the issue of Skype hanging, and the audio issues. I am not using bluetooth , nor external speakers, but the issue does tend to manifest after playing world of tanks, not sure if this is triggering the problem or suffering from the same problem brought on from somewhere else.