Yes, thanks. I had already tried that and found no keyboard response. That seems to be the problem. When I tried it again just now the disk light flashed madly so maybe the system has got itself into a race condition. This new machine came from a company which builds bespoke machines for gamers. The motherboard may be new to Linux. The whole machine is lightning fast - 4 seconds from boot to login screen. So I suspect timing and contention problems. Have to wait until the updated kernels and dkms come back into sync perhaps.
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..........bird from paradise..........
Perfection is achieved, not when there is nothing more to add, but when there is nothing left to take away. —Antoine de Saint-Exupéry