Question: How to I set the frequency to 1.8/1.4GHz?
Just set it to 1.8 GHz and you're done. Little cores at 1.4GHz or 1.5GHz doesn't change a lot, it's the big cores that make the difference.
xhci-hcd xhci-hcd.11.auto: Ring expansion failed
Known 'USB sucks on Linux' problem but this shouldn't occur with my OMV image since https://forum.armbian.com/topi…oherent-pool-memory-size/ -- if this also occurs with the Armbian based OMV image then please report this over at Armbian (I stopped contributing there)