I have recently changed the generic kernel from ubuntu 21.10 to liquorix 5.16-8ubuntu1~impish, but the bluetooth works very badly and I don't know what I should look for to make it work the same as the generic version.
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Start with showing: inxi -bExz

that will show your bluetooth and basic system info.

If for some reason inxi -bExz doesn't work, try: -bxz but that means your system is probably too old anyway to run liquorix.
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I think this is the relevant info from inxi


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Hmm, that sounds like you might have an imbalance between the newer kernel and older firmware.

What's the output of sudo journalctl -k | grep -i firmware?

Also separately, the output of sudo journalctl -k | grep -i bluetooth.
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This is what I got;

sudo journalctl -k | grep -i bluetooth
systemd-sysv-generator[379]: Native unit for bluetooth.service already exists, skipping.
systemd-sysv-generator[379]: Ignoring S01bluetooth symlink in rc2.d, not generating bluetooth.service.
systemd-sysv-generator[379]: Ignoring S01bluetooth symlink in rc3.d, not generating bluetooth.service.
systemd-sysv-generator[379]: Ignoring S01bluetooth symlink in rc4.d, not generating bluetooth.service.
systemd-sysv-generator[379]: Ignoring S01bluetooth symlink in rc5.d, not generating bluetooth.service.
systemd[1]: unit_file_build_name_map: alias: /etc/systemd/system/dbus-org.bluez.service → bluetooth.service
kernel: Bluetooth: Core ver 2.22
kernel: NET: Registered PF_BLUETOOTH protocol family
kernel: Bluetooth: HCI device and connection manager initialized
kernel: Bluetooth: HCI socket layer initialized
kernel: Bluetooth: L2CAP socket layer initialized
kernel: Bluetooth: SCO socket layer initialized
kernel: Bluetooth: hci0: Legacy ROM 2.5 revision 8.0 build 2 week 3 2013
kernel: Bluetooth: hci0: Intel device is already patched. patch num: 57
kernel: Bluetooth: BNEP (Ethernet Emulation) ver 1.3
kernel: Bluetooth: BNEP filters: protocol multicast
kernel: Bluetooth: BNEP socket layer initialized
kernel: Bluetooth: RFCOMM TTY layer initialized
kernel: Bluetooth: RFCOMM socket layer initialized
kernel: Bluetooth: RFCOMM ver 1.11
systemd-sysv-generator[7296]: Native unit for bluetooth.service already exists, skipping.
systemd-sysv-generator[7296]: Ignoring S01bluetooth symlink in rc2.d, not generating bluetooth.service.
systemd-sysv-generator[7296]: Ignoring S01bluetooth symlink in rc3.d, not generating bluetooth.service.
systemd-sysv-generator[7296]: Ignoring S01bluetooth symlink in rc4.d, not generating bluetooth.service.
systemd-sysv-generator[7296]: Ignoring S01bluetooth symlink in rc5.d, not generating bluetooth.service.
systemd-sysv-generator[7321]: Native unit for bluetooth.service already exists, skipping.
systemd-sysv-generator[7321]: Ignoring S01bluetooth symlink in rc2.d, not generating bluetooth.service.
systemd-sysv-generator[7321]: Ignoring S01bluetooth symlink in rc3.d, not generating bluetooth.service.
systemd-sysv-generator[7321]: Ignoring S01bluetooth symlink in rc4.d, not generating bluetooth.service.
systemd-sysv-generator[7321]: Ignoring S01bluetooth symlink in rc5.d, not generating bluetooth.service.
systemd-sysv-generator[7381]: Native unit for bluetooth.service already exists, skipping.
systemd-sysv-generator[7381]: Ignoring S01bluetooth symlink in rc2.d, not generating bluetooth.service.
systemd-sysv-generator[7381]: Ignoring S01bluetooth symlink in rc3.d, not generating bluetooth.service.
systemd-sysv-generator[7381]: Ignoring S01bluetooth symlink in rc4.d, not generating bluetooth.service.
systemd-sysv-generator[7381]: Ignoring S01bluetooth symlink in rc5.d, not generating bluetooth.service.
systemd-sysv-generator[7414]: Native unit for bluetooth.service already exists, skipping.
systemd-sysv-generator[7414]: Ignoring S01bluetooth symlink in rc2.d, not generating bluetooth.service.
systemd-sysv-generator[7414]: Ignoring S01bluetooth symlink in rc3.d, not generating bluetooth.service.
systemd-sysv-generator[7414]: Ignoring S01bluetooth symlink in rc4.d, not generating bluetooth.service.
systemd-sysv-generator[7414]: Ignoring S01bluetooth symlink in rc5.d, not generating bluetooth.service.

sudo journalctl -k | grep -i firmware

kernel: Spectre V2 : Enabling Restricted Speculation for firmware calls
kernel: ACPI: [Firmware Bug]: BIOS _OSI(Linux) query ignored
kernel: iwlwifi 0000:09:00.0: loaded firmware version 17.3216344376.0 7260-17.ucode op_mode iwlmvm

thank you for your help
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Your system seems to be fine and you have the latest firmware, so most likely you're experiencing a kernel regression. Searching bugzilla lead me to this open issue: bugzilla.kernel.org/show_bug.cgi?id=203535. They recommend disabling btusb's autosuspend with:



Then reboot.

Also, did you get the output from those two commands after you had experienced problems with bluetooth? Typically you'll see a lot of log entries when something's going wrong, but if you pulled those logs right after booting then everything will look hunky dorey.

One last thing, can you provide the output of sudo journalctl -u bluetooth -b0 after using whichever bluetooth device that's problematic?
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My problem is solved. Thank you very much for your unparalleled help.

I already have the btusb enable_autosuspend=0 option built in.
I don't know exactly how it was fixed. But in sudo upgrade a security update appeared. I also installed some bluetooth utilities through synaptic related to bluetooth in case some library could correct the problem. And I also changed the antennas that the wifi/bluetooth uses.
Now bluetooth has a powerful clean connection.
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