Dual SIM Audio Routing Issue — Temporary Workaround Found

[ahmedmido3330]

Devices:

• Samsung Galaxy M11 (SDM450)
• Samsung Galaxy A11 (SDM450)
• Samsung Galaxy A20s (SDM450)

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Expected Behavior (Single SIM Mode)

• Inserting a SIM in slot 1 or slot 2: audio works fine during calls.

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Bug (Dual SIM Mode)

• When both SIMs are inserted:
  • Only one SIM (usually the one with data enabled) has working audio.
  • The second SIM has no audio during calls.
  • Switching call to that SIM results in silence (no mic/no speaker audio).

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Workaround

• Temporarily enable mobile data on the affected SIM before or during the call, then disable it again.
• This reinitializes audio routing and makes audio work normally.
• We tested and confirmed this behavior multiple times.

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Notes

• Before patching, audio only worked on SIM1.
• After implementing logic to handle g_call_sim_slot, g_call_state and binding them to the active data subscription, audio started working on both SIMs — but still requires toggling data.

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Suggestion

Please consider applying this logic in official builds:

• When call starts, auto-switch data briefly to the call SIM to initialize audio path (then revert back after a short delay or after the call ends).
• Or improve internal audio routing behavior based on active call SIM instead of active data SIM.

[InsertX2k]

I think this patch should also work for other samsung devices, not just the ones that run on the Snapdragon 450 SoC