This is really disappointing. What the hell is Metal? IBM, AMD, Intel, and NVidia use OpenCL... I agree with the poster who said that Apple helped develop the OpenCL standard and now seems to have dropped it without any real notice to developers or explanation why.
ryanoc
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Same problem with a 1 month old M1 Macbook Air after updating to Big Sur and restarting after a few weeks of putting the laptop to sleep by closing the lid. Luckily resetting the SMC (using T2 chip instructions) worked when nothing else did for me, let's hope it doesn't happen again. Really unimpressed by the lack of proper resolution of this issue by Apple developers.