Strange Resume behaviour of N5321 since 4.19

[Nick]

Hey,

Not sure if related, but I have been struggling with a similar, seemingly USB related issue on 4.19.xx.  In my case the modem completely disappears and only a reboot of the host system will fix it.   I am documenting it here: https://forum.openwrt.org/t/ipq4019-xhci-hcd-host-died/47237 <https://forum.openwrt.org/t/ipq4019-xhci-hcd-host-died/47237>
[566389.792034] usb 1-1: USB disconnect, device number 2
[566394.603851] cdc_mbim 1-1:1.12: Tx URB error: -19
[566394.829730] xhci-hcd xhci-hcd.0.auto: xHCI host not responding to stop endpoint command.
[566394.846083] xhci-hcd xhci-hcd.0.auto: Host halt failed, -110
[566394.846315] xhci-hcd xhci-hcd.0.auto: xHCI host controller not responding, assume dead
[566394.851573] xhci-hcd xhci-hcd.0.auto: HC died; cleaning up
[566394.862108] qcserial ttyUSB0: Qualcomm USB modem converter now disconnected from ttyUSB0
[566394.865473] qcserial 1-1:1.0: device disconnected
[566394.880516] qcserial ttyUSB1: Qualcomm USB modem converter now disconnected from ttyUSB1
[566394.881892] qcserial 1-1:1.3: device disconnected
[566394.892850] cdc_mbim 1-1:1.12 wwan0: unregister 'cdc_mbim' usb-xhci-hcd.0.auto-1, CDC MBIM
[566394.897722] failed to kill vid 0081/0 for device wwan0

Best,
Nicholas
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