Mobian+phosh on pine modem disconnect in deep sleep/sim pin dialog keeps popping

tuxphones · January 13, 2023, 6:17pm

Hi!

i’m digging further in the linux phone world, been trying using my phone sim card for real world use.
this is on a pine dev edition (messing about while waiting for my librem ^^) with mobian installed

something i’ve noticed is that after the phone is in sleep for a while (prob entering deep sleep mode) the modem seems to disconnect (icons go away no provider listed etc) and when i power it up the sim unlock dialog pops again and after that the modem seems to connect to the telecom network again (at least the UI makes it look like this)

is there a way to have the phone remember the sim pin (the device is encrypted and password locked anyway)? and to keep the modem online?

for this behaviour has me wondering if i can receive calls/texts in this state and you kind of don’t want to miss that 1 vital call when there is a need for relatives or other important persons to get in touch with you.

any thoughts or help would be most welcome!
i want to get to a point where i can trust linux phones for the important stuff so i can ditch the android phone

thanks!

Jt0 · January 21, 2023, 1:21pm

You may be able to prevent the modem from disconnecting by adding a udev rule as described in

github.com

the-modem-distro/pinephone_modem_sdk/blob/honister/docs/SETTINGS.md

# Recommended settings
This document describes recommended settings you can apply to your Pinephone or Pinephone Pro to get the best experience out of the modem

## Common
1. If your carrier doesn't provide an alerting tone indication, calls are completely silent until the other party picks up the phone
 - You can enable a local emulation of the alerting tone on the modem, by using the following command (as root): `echo -ne "AT+EN_CAT\r" > /dev/ttyUSB2`

## Pinephone
1. Frequent disconnects and reconnects (Modem vanishes and reappears a few seconds later during operation or after waking up from suspend)

Sometimes the kernel is too aggressive trying to suspend the USB port when it's actually in use. Disabling runtime suspend for the port usually helps a lot. 
- Edit `/usr/lib/udev/rules.d/80-modem-eg25.rules`
- Look at the first line where it says `ACTION=="add", SUBSYSTEM=="usb", DRIVERS=="usb", ENV{DEVTYPE}=="usb_device", ATTRS{idVendor}=="2c7c", ATTRS{idProduct}=="0125", ATTR{power/control}="auto"`
- And change it to ON `ACTION=="add", SUBSYSTEM=="usb", DRIVERS=="usb", ENV{DEVTYPE}=="usb_device", ATTRS{idVendor}=="2c7c", ATTRS{idProduct}=="0125", ATTR{power/control}="on"`

2. Audio volume is too low
- Edit the ALSA UCM config file `/usr/share/alsa/ucm2/PinePhone/VoiceCall.conf` and look for the following parameters:
  - `AIF2 DAC Playback Volume`
  - `AIF2 ADC Capture Volume`
- Replace their values with `80%` or `90%` (some people noticed that 90% gets echo at the other side of the call, but doesn't happen to everyone, so feel free to experiment with the most suitable values for you)

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Not sure about the SIM PIN. It may be a moot point if the above keeps the modem from sleeping.

As of the last time I was using the Pinephone’s calling ability (November 2022) on Mobian, the modem would reliably wake up from suspend for phone calls and texts. This was with the open source firmware from the git repo linked above.

tuxphones · January 14, 2023, 7:59am

thanks for the answer I’ll check that out!

tuxphones · January 19, 2023, 6:51am

ok replied to early i mixed my posts in various topics, dove a bit further in this and found the file it’s not quite the same so i need to dig a bit deeper

tuxphones · January 20, 2023, 4:01pm

This does seem to keep the modem on, but it still seems to asks for the sim pim. looks like the modem displays on but not connected (strike through) in that case

i’ll test a bit further

tuxphones · January 21, 2023, 1:21pm

Ok maybe something went wrong, but the solution from jt0 seemed to work

my file was slightly different i changed the lop of the file below # Default attributes values to

LABEL="eg25_start" ATTRS{idVendor}=="2c7c", ATTRS{idProduct}=="0125", ATTR{power/control}="on" ATTRS{idVendor}=="2c7c", ATTRS{idProduct}=="0125", ATTR{power/autosuspend_delay_ms}="3000" ATTRS{idVendor}=="2c7c", ATTRS{idProduct}=="0125", ATTR{power/wakeup}="enabled" ATTRS{idVendor}=="2c7c", ATTRS{idProduct}=="0125", ATTR{power/persist}="0"
ATTR{power/control}="on" was auto like in the original solution post above

havn’t seen the pin request anymore, phone seems to connect calls after a night on my nightstand so much better ^^