included in 5.15
** Changed in: hwe-next
Status: New => Fix Released
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https://bugs.launchpad.net/bugs/1966497
Title:
Fix non-working MT7921 BT after reboot
Status in HWE Next:
Fix Released
Status in linux-oem-5.14 package in Ubuntu:
Invalid
Status in linux-oem-5.14 source package in Focal:
Fix Released
Bug description:
[Impact]
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
unplugged.
[Fix]
In addition to SRU "Need to reset MT7921 BT when the firmware hang or
command no response", enable MSFT extension can magically solve the
issue.
[Test]
With the patch applied, the MT7921 BT continues to work after 100 times
reboots.
[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.
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