I'm doing several builds and testing different devices and this issue is
persistent on the x86_64 build for the PC Engine APU hardware.
(I did not encounter it on the Espressobin v7 hardware.)
I have several modems but I am testing with a Sierra Wireless MC7455 which
seems to be a popular one that is also raw-ip only.
As a quick-fix bringing the interface down and back up where the
/lib/netifd/proto/qmi.sh script attempts to change-over to raw-ip seems to work
but I'm not certain if its "the right way" to fix this issue. It seems to take
a while so I think it's retrying later and working the second time.
echo "Device does not support 802.3 mode. Informing driver of
raw-ip only for $ifname .."
ifconfig $ifname down
echo "Y" > /sys/class/net/$ifname/qmi/raw_ip
ifconfig $ifname up
Some snippets from the kernel log:
[ 8.744638] qmi_wwan 1-1.3:1.8: cdc-wdm0: USB WDM device
[ 8.751778] qmi_wwan 1-1.3:1.8 wwan0: register 'qmi_wwan' at
usb-0000:00:13.0-1.3, WWAN/QMI device, fa:8c:eb:d2:d5:df
[ 8.765196] qmi_wwan 1-1.3:1.10: cdc-wdm1: USB WDM device
[ 8.772501] qmi_wwan 1-1.3:1.10 wwan1: register 'qmi_wwan' at
usb-0000:00:13.0-1.3, WWAN/QMI device, fa:8c:eb:d2:d5:df
[ 8.784460] usbcore: registered new interface driver qmi_wwan
[ 8.793076] usbcore: registered new interface driver rndis_host
[ 8.800987] usbcore: registered new interface driver sierra
[ 8.806989] usbserial: USB Serial support registered for Sierra USB modem
...
[ 13.569617] qmi_wwan 1-1.3:1.8 wwan0: Cannot change a running device
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