[Bug 2063067] Re: Fix bluetooth connections with 3.0 device

This bug is awaiting verification that the linux-
azure-5.15/5.15.0-1065.74~20.04.1 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-linux-
azure-5.15' to 'verification-done-focal-linux-azure-5.15'. If the
problem still exists, change the tag 'verification-needed-focal-linux-
azure-5.15' to 'verification-failed-focal-linux-azure-5.15'.


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!


** Tags added: kernel-spammed-focal-linux-azure-5.15-v2 verification-needed-focal-linux-azure-5.15

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https://bugs.launchpad.net/bugs/2063067

Title:
Fix bluetooth connections with 3.0 device

Status in HWE Next:
In Progress
Status in linux package in Ubuntu:
New
Status in linux-oem-6.5 package in Ubuntu:
Invalid
Status in linux source package in Jammy:
Fix Committed
Status in linux-oem-6.5 source package in Jammy:
Fix Released
Status in linux source package in Mantic:
Fix Committed
Status in linux-oem-6.5 source package in Mantic:
Invalid

Bug description:
[Impact]
Bluetooth keyboard cannot be connected to Realtek BT controller.

[Fix]
It's a regression from Ubuntu-6.5.0-20.20 and Ubuntu-oem-6.5-6.5.0-1016.17
The bad commit:
c7f59461f5a78 ("Bluetooth: Fix a refcnt underflow problem for hci_conn")
Fix:
7e74aa53a68bf ("Bluetooth: hci_event: Fix handling of HCI_EV_IO_CAPA_REQUEST")

[Test]
Tested on hardware, the bt3.0 keyboard connects to host well.

[Where problems could occur]
It may break bluetooth.

The commit is already in v6.8-rc7,
SRU Jammy, oem-6.5 and Mantic.

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