This bug is missing log files that will aid in diagnosing the problem.
While running an Ubuntu kernel (not a mainline or third-party kernel)
please enter the following command in a terminal window:
apport-collect 1872122
and then change the status of the bug to 'Confirmed'.
If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.
This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.
** Changed in: linux (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1872122
Title:
Kernel 4.19+: Bluetooth not working; Ubuntu 20.04
Status in linux package in Ubuntu:
Incomplete
Bug description:
New bug report for kernel:
After testing Ubuntu 20.04 on my Intel NUC (NUC8i3BEH) I found out, that
Bluetooth (LE) [hardware: Intel Wireless-AC 9560] isn't working; hcitool lescan
reports:
hcitool lescan
Set scan parameters failed: Input/output error
When the error occurs, btmon is reporting:
> HCI Event: Command Complete (0x0e) plen 4 #4 [hci0]
20:22:26.130058
LE Set Scan Enable (0x08|0x000c) ncmd 1
Status: Command Disallowed (0x0c)
Beside the following error messages, there are no clues in the syslog
concerning the error as far as I can tell:
[ 138.152718] debugfs: File 'le_min_key_size' in directory 'hci0' already
present!
[ 138.152722] debugfs: File 'le_max_key_size' in directory 'hci0' already
present!
After testing the Ubuntu kernels I found out that this Bluetooth LE scanning
works just fine with Kernel 4.15 (Ubuntu 18.04 up to date standard kernel) and
Kernel 4.18 (Ubuntu 18.04.1 HWE EOL kernel).
The problem starts from kernel version 5.0 (Ubuntu 18.04.2 HWE kernel) and is
reproducible with the current Ubuntu 20.04 standard kernel.
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