Comment # 7 on bug 1192091 from
Thanks.  So the situation looks like:
- Some USB-related patches in 5.15 made things broken, and those are backported
between 5.14.11 and 5.14.14
- It's fixed eventually in linux-next for 5.16-rc1

FWIW, the patches I disabled are:
 
patches.kernel.org/5.14.12-001-Partially-revert-usb-Kconfig-using-select-for.patch
  patches.kernel.org/5.14.12-002-usb-cdc-wdm-Fix-check-for-WWAN.patch
 
patches.kernel.org/5.14.12-003-usb-chipidea-ci_hdrc_imx-Also-search-for-phys.patch
 
patches.kernel.org/5.14.12-004-usb-gadget-f_uac2-fixed-EP-IN-wMaxPacketSize.patch
  patches.kernel.org/5.14.12-005-USB-cdc-acm-fix-racy-tty-buffer-accesses.patch
  patches.kernel.org/5.14.12-006-USB-cdc-acm-fix-break-reporting.patch
 
patches.kernel.org/5.14.12-007-usb-typec-tcpci-don-t-handle-vSafe0V-event-if.patch
 
patches.kernel.org/5.14.12-008-usb-typec-tcpm-handle-SRC_STARTUP-state-if-cc.patch
 
patches.kernel.org/5.14.12-009-usb-typec-tipd-Remove-dependency-on-connector.patch
  patches.kernel.org/5.14.14-048-usb-musb-dsps-Fix-the-probe-error-path.patch


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