No phone app output and input if device booted with Mobile data disabled

REPRODUCIBILITY: 100% (always)
OSVERSION: 5.0.0.62
HARDWARE: Xperia XA2 - h3113 - h3113 - 1.0.0.28 - armv7hl
UI LANGUAGE: Polski (user: pl_PL, os: pl_PL.utf8)
REGRESSION: not specified

DESCRIPTION:

Hard to say whether this is a connevity or audio issue.

PRECONDITIONS:

STEPS TO REPRODUCE:

  1. Disable mobile data, enable WiFi
  2. Reboot device
  3. Make or pick up a call

EXPECTED RESULTS:

Fully functional telephone app

ACTUAL RESULTS:

Phone sound output nor input does not work. Neither the caller nor receiver can hear anything. No matter what direction the call was initiated.

Moreover, re-enabling Mobile data and redoing the call does not improve situation. Only a reboot with Mobile data enabled restores the functionality.

MODIFICATIONS:

  • Patchmanager: yes
  • OpenRepos: no
  • Chum: yes
  • Other: yes: Patchmanager installed, but not applying any patches.

ADDITIONAL INFORMATION:

Device Owner User: defaultuser
Home Encryption: enabled
Mobile connection: prefered 4G
Mobile network: Play, P4, Poland (MCC-MNC: 260-006)

the initial version of this bug report was created using Bugger 0.9.15+git3