Hi, This is a follow up on the recently discussed issue with EM7511 and the AUTO-SIM feature. When the carrier is set to AUTO_SIM, the modem will automatically set the appropriate profile, and reboot for this profile to take effect.
A recent version of MM temporarily switches to every installed SIM during probing, in order to retrieve SIM information. The logic is summarized in the commit message https://github.com/freedesktop/ModemManager/commit/7c76450c15555204d14a8ce0550dc2c639d288b3 . Unfortunately, what we observe is these two features together seem to cause an infinite reboot loop after a SIM switch. 1. Suppose, the SIM 1 is active now and the profile set to AUTO-SIM. 2. We ask the MM to switch to SIM 2. 3. The modem reboots, on its own. The MM detects the modem disappearing and has to cancel whatever it was doing to it. 4. When the modem comes back up, MM retrieves the slot status list and initiates the switching loop (see uim_get_slot_status_ready()). It first switches to SIM 1... 5. Repeat starting with step 3. I hope there is something I am missing, but this is what it looks like. I wonder if this is a general issue affecting any users with AUTO-SIM enabled and also what could be a right approach to address this. Currently, we are trying a "solution" that would disable the AUTO-SIM (switch to the current profile) before the SIM enumeration loop, and re-enable it again afterwards. By patching the MM. Any ideas are appreciated. Regards, Alexey Karyakin
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