Bluetooth hands-free output not available during voicecall on GeminiPDA

REPRODUCIBILITY: 100%
OS VERSION: 4.4.0.72
HARDWARE: geminipda x27
UI LANGUAGE: pl_PL
REGRESSION: cannot state, newly flashed system.

DESCRIPTION:

During the voicecall bluetooth output is not active. InCall screen of voicecall-ui does not show the hands-free icon and the voice is played through earpiece or speaker only.

PRECONDITIONS:

Paired with bluetooth enabled hands free accessory or bluetooth car system.

STEPS TO REPRODUCE:

  1. Pair with bluetooth hands-free accessory
  2. Start the call
  3. Voice is played through the earpiece, no ability to switch to bluetooth output

EXPECTED RESULT:

Voicecall-ui shows the hands-free icon and it is possible to route audio input/output to bluetooth device.

ACTUAL RESULT:

Input and output from bluetooth hands-free accessory is not active during voicecall.

MODIFICATIONS:

None, purely flashed system.

ADDITIONAL INFORMATION:

Accessories used were double checked with xperia 10 II 4.4.0.72 and resulted in expected operation.

EDIT:
Comparing outputs of voicecall-ui on the gemini and 10 II when paired with bluetooth device, on the gemini there is one extra line:

[W] unknown:0 - Cannot open /dev/rfkill for reading!

and in fact /dev/rfkill device is missing on the gemini while on the xperia this device exists and is owned by bluetooth user:
crw-rw---- 1 bluetoot bluetoot 10, 242 Dec 29 11:06 /dev/rfkill

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