Thanks for this report but not sure what we can help with here.
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You’re using an Alpha build and having some problems. Got that.
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Future, might be, on non-public software ? We can’t touch that. Not actionable.
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Nvidia working - Good.

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Arc A380 not working - ARC GPUs are not officially supported (drivers & libraries are not included with PMS). ARC GPU support is, at present time, your responsibility (very much like current AMD support)
Am I missing something?