Hi Denis, Per question, "So doesn't this also cause us to bring the modem offline when we wake up from resume?" Yes, it does. While this modem is capable of waking the host CPU via GPIO upon SMS reception, it doesn't have a handshake mechanism for the host to signal that it's ready to communicate with the modem, which would allow the host to prevent the modem from sending the QMI indication too early. Frustratingly, this handshake does exist if the modem is used with the AT interface. I tried to convince the vendor that the handshake should be applied to the QMI interface too, but...

Per comment, "So any state data must be allocated as part of the driver data." Thanks for the insight. Are you referring to "struct sms_data"?

I've copied my other email, so hopefully my future responses won't break this chain. Also, thank you for helping with the IMEI patch.