[SRU] [OEM-5.14] [PATCH 0/1] Fix non-working MT7921 BT after reboot

Kai-Heng Feng kai.heng.feng at canonical.com
Fri Mar 25 15:53:46 UTC 2022

BugLink: https://bugs.launchpad.net/bugs/1966497

There's a high chance that MT7921 BT may go out to lunch after reboot.
Worse, there's no way to recover the controller unless the power cord is

In addition to SRU "Need to reset MT7921 BT when the firmware hang or
command no response", enable MSFT extension can magically solve the

With the patch applied, the MT7921 BT continues to work after 100 times

[Where problems could occur]
This fix is specific to MTK BT controllers, so the change is limited.

I totally don't understand why this patch can fix the issue, other than
it just does the trick. So I guess we have to accept the reality that
hardwares can have their own quirks.

mark-yw.chen (1):
  Bluetooth: btusb: Enable MSFT extension for Mediatek Chip (MT7921)

 drivers/bluetooth/btusb.c | 2 ++
 1 file changed, 2 insertions(+)


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