Fix non-working MT7921 BT after reboot
Bug #1966497 reported by
Kai-Heng Feng
This bug affects 2 people
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
HWE Next |
Fix Released
|
Undecided
|
Unassigned | ||
linux-oem-5.14 (Ubuntu) |
Invalid
|
Undecided
|
Unassigned | ||
Focal |
Fix Released
|
Medium
|
Unassigned |
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.
Changed in linux-oem-5.14 (Ubuntu Focal): | |
status: | New → Confirmed |
importance: | Undecided → Medium |
Changed in linux-oem-5.14 (Ubuntu): | |
status: | New → Invalid |
tags: | added: oem-priority originate-from-1961591 sutton |
Changed in linux-oem-5.14 (Ubuntu Focal): | |
status: | Confirmed → Fix Committed |
tags: |
added: verification-done-focal removed: verification-needed-focal |
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This bug is awaiting verification that the linux-oem- 5.14/5. 14.0-1033. 36 kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification- needed- focal' to 'verification- done-focal' . If the problem still exists, change the tag 'verification- needed- focal' to 'verification- failed- focal'.
If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed.
See https:/ /wiki.ubuntu. com/Testing/ EnableProposed for documentation how to enable and use -proposed. Thank you!