[Bug 222151] MT7925 (0489:e111): BT firmware 20260813113236 (linux-firmware 50e034a2) breaks HFP calls and fails WMT init; 20260605184935 works

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=222151

--- Comment #1 from purpleritza@gmail.com ---
Correction after further analysis: most of the call failures in my original
report were NOT caused by the firmware. The repeating failures correlate with
the wireplumber version, not the BT firmware build.

Per boot, counting "Failure in Bluetooth audio transport" loops (>= 4 within
3 minutes: HFP/A2DP profile flip-flopping, both bluez nodes going to error):

  Boot start        wireplumber  BT firmware build          Loops
  ----------------  -----------  -------------------------  -----
  2026-09-28 12:40  0.5.15       20260813113236                 0
  2026-10-03 11:07  0.5.18       20260605 + 20260813            3
  2026-10-07 11:36  0.5.18       20260605184935                 1
  2026-10-07 11:59  0.5.15       20260605184935                 0
  2026-10-15 11:00  0.5.15       20260605184935                 0
  2026-10-17 19:53  0.5.15       20260605 + 20260813            0
  2026-10-25 15:49  0.5.18       20260605184935                 5

Every loop happened on wireplumber 0.5.18, with either firmware build; none
on 0.5.15. I will report that part to wireplumber separately.

What remains attributable to firmware 20260813113236:

1. WMT init failure on this machine:

  BT build        Loads  WMT init failures
  20260605184935     71  0
  20260813113236     16  2 (2026-09-27, 2026-10-17)

2. Single mid-call HFP drops with wireplumber 0.5.15:

  BT build        Time on wireplumber 0.5.15  Mid-call HFP drops
  20260605184935  ~16 days                    0
  20260813113236  ~7.5 days                   2 (2026-09-28, 2026-10-19
12:02:56)

   The 2026-10-19 drop is the log in my original report. The only drop seen
   on 20260605184935 was during A2DP playback, not a call. Small sample, so
   weaker evidence than the WMT init failure.

Current setup, no call problems so far: linux-firmware-mediatek 20260810-2
(BT build 20260605184935) + wireplumber 0.5.15, kernel 7.2.11.

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