I followed these steps again but nothing happens.

❯ bluetoothctl

Agent registered

[bluetooth]# scan on

No default controller available

[bluetooth]#

Device is not blocked by rfkill

In the same wiki found this .

Added btusb.enable_autosuspend=n from grub but still the problem persist.

❯ cat /proc/cmdline

BOOT_IMAGE=/boot/vmlinuz-linux root=UUID=966747c5-6662-40f9-8c7f-934d4b63bafe rw

loglevel=3 quiet btusb.enable_autosuspend=n

​

Card - Intel Wireless-AC 9560

I don't know if this is the solution ( noob alert) , its some kernel 5.15 bug https://www.mail-archive.com/debian-bugs-dist@lists.debian.org/msg1832263.html

tried with kernel 5.14 bluetooth works