Created attachment 828953 [details] CMA=192M > feb 03 13:53:26 bach2 kernel: xhci_hcd 0000:01:00.0: Ring expansion failed Could mean that we ran out of CMA and no more coherent memory is available. Hence, the clock change fail. Freek, could you overwrite the 'rpi4-cma.dtbo' file in '/boot/efi/overlays' with this version that sets it to 192MB and retest?