device-pine64-pinephone: cannot reliably receive calls in suspend

pmOS Edge

device-pine64-pinephone-1-r0

linux-postmarketos-allwinner-6.8.4_git20240405-r1

Phosh

Receiving a call while suspended, shows the gnome-calls UI with Accept / Decline buttons. Selecting the Accept button begins to accept the call for a few seconds, then disconnects. After some time the modem indicator disappears and eg25-manager needs to be restarted manually to bring it back.

logread says:

[Apr 11 09:08:53] daemon [3726]: <msg> [modem5/call25] user request to accept call
[Apr 11 09:08:58] daemon [3726]: <wrn> [modem5] port cdc-wdm0 timed out 2 consecutive times
[Apr 11 09:08:58] daemon [3726]: <wrn> [modem5] port cdc-wdm0 timed out 3 consecutive times
[Apr 11 09:08:58] daemon [3726]: <wrn> [modem5] port cdc-wdm0 timed out 4 consecutive times
[Apr 11 09:08:58] daemon [3726]: <wrn> [modem5] could not load SIM identifier: QMI operation failed: Transaction timed out (3 retries left)
[Apr 11 09:08:58] daemon [3726]: <wrn> [modem5] couldn't reload call list: QMI operation failed: Transaction timed out
[Apr 11 09:08:58] daemon [3726]: <msg> [modem5/call25] call state changed: ringing-in -> terminated (error)
[...]
[Apr 11 09:09:31] daemon [3726]: <wrn> [modem5] port cdc-wdm0 timed out 9 consecutive times
[Apr 11 09:09:31] daemon [3726]: <wrn> [modem5] could not load SIM identifier: QMI operation failed: Transaction timed out
[Apr 11 09:09:31] daemon [3726]: <msg> [modem5] SIM identifier has changed: '###' -> '###'
[Apr 11 09:09:32] daemon [3726]: <err> [modem5] port cdc-wdm0 timed out 10 consecutive times, marking modem as invalid

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Sometimes the incoming call during suspend can be accepted, but the display keeps flickering on and off rapidly instead of consistently staying on. Pressing the power button doesn't make a difference.

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Outgoing calls work fine. Incoming calls while not suspended also work fine.

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TODO:

• Is this new with the 6.8.4 kernel or did it also happen with 6.7.9?

• Is this caused by the udev rule to restart eg25-manager added in d67aa6b4 ?

• Does using kernel modem power driver instead of eg25-manager make any difference?

cc @alaraajavamma