Score:0

Ubuntu

Bluetooth Inactive (dead) Module btusb not found in directory /lib/modules/5.15.0-56

David

12/4/23, 8:21 PM

I am using a Lenovo Thinkpad L470 and Ubuntu 20.04 LTS. Similar problems have been posed in the past, and I tried their solutions but to no avail.

Up to this morning bluetooth was running correctly on my laptop. Then I downloaded some drver thinking I was in another kernel than the one in the subject line. After that bluetooth quit on me.

I have tried removing and re-installing all the BT related packages, re-installed bluez, which tells me I have the most current version.

Lastly I did a modprobe btusb and got the return that btusb was not loaded. On top of that it could not be found in /lib/modules/5.15.0-56-generic.

So obviously something is missing.

Upon invoking systemctl status bluetooth I get the message

● bluetooth.service - Bluetooth service
     Loaded: loaded (/lib/systemd/system/bluetooth.service; enabled; vendor pre>
     Active: inactive (dead)
       Docs: man:bluetoothd(8)

Dez 04 21:16:30 thinkpad470 systemd[1]: Condition check resulted in Bluetooth s>
Dez 04 21:23:45 thinkpad470 systemd[1]: Condition check resulted in Bluetooth s>
lines 1-7/7 (END)

I hope someone can help out of the mess I created and help me get my bluetooth back.

Thanks! David

3341

3 + 0

bluetooth

20.04

Score:1

Ubuntu

Jeremy31

12/4/23, 8:58 PM

In terminal do sudo apt install --reinstall linux-modules-extra-5.15.0-56-generic

Then reboot

+ 18

David

12/6/23, 8:43 AM

"modules-extra-5.15.0-56.generic" couldn't be found. Missing a repository? Can you help further? Thanks in advance! David

David

12/6/23, 8:55 AM

I did find a .deb version from ubuntu website. Since modules-extra is already installed the sw-installer would require that I first delete it before I can install the deb package. I fear that some other things might fail, like my ethernet and wifi apdaters and then I can no longer use the internet. What do you suggest? Again, thanks! David

Jeremy31

12/6/23, 10:07 PM

Strange that you can have linux-modules-extra installed for the kernel and not have btusb.ko

David

12/7/23, 12:43 PM

I'm sure it was there before my mishap. BT was running fine until I began installing something that I should not have.

David

12/7/23, 12:46 PM

I found "Linux kernel extra modules for version 5.15.0 on 64 bit x86 SMP" in Synaptic Package Manager as installed (green). I thought I could re-install it to include the missing btusb. I saw this warning and am hesitant to proceed. What do you think? "You likely do not want to install this package directly. Instead, install the linux-generic meta-package, which will ensure that upgrades work correctly, and that supporting packages are also installed." Would I mess things up more?

Jeremy31

12/7/23, 9:59 PM

Edit the question to include results for `dkms status`

David

12/8/23, 5:19 PM

I hope his helps:

David

12/8/23, 5:19 PM

david@thinkpad470:~$ dkms status rtbth, 3.9.7, 5.15.0-56-generic, x86_64: installed v4l2loopback, 0.12.3, 5.15.0-53-generic, x86_64: installed v4l2loopback, 0.12.3, 5.15.0-56-generic, x86_64: installed virtualbox, 6.1.38, 5.15.0-53-generic, x86_64: installed virtualbox, 6.1.38, 5.15.0-56-generic, x86_64: installed david@thinkpad470:~$

Jeremy31

12/8/23, 9:55 PM

try `sudo dkms uninstall rtbth/3.9.7 && sudo dkms remove rtbth/3.9.7 --all` then reboot

David

12/9/23, 3:58 PM

thank you I will try it. Now that I know the name of the file to look for I did find btusb.ko in /usr/lib/modules/5.15.0-53-generic/kernel/drivers/bluetooth and the file rtk_btusb.ko in /usr/lib/modules/5.15.0-56-generic/kernel/drivers/bluetooth

David

12/9/23, 4:08 PM

Unfortunately it did not work. Looks like I really effed up my BT. This is name of the file (compressed) I began installing and broke off after I thought it was a bad idea: mpow_BH519A_driver+for+Linux.7z

Jeremy31

12/10/23, 3:58 PM

It looks like installing that driver renames btusb, Try `cd /lib/modules/$(uname -r)/kernel/drivers/bluetooth && sudo mv btusb_bak btusb.ko` Then reboot

David

12/12/23, 5:37 PM

Did what you suggested. Didn't work. looked at BT packages in synaptic pkg mgr. All referenced kernel 5.15.0-53. Uh huh. Booted into this kernel and viola! BT works. Now how to troubleshoot differences between both kernels -53 and -56. Suggestions? Again, thank you for your time and patience helping me. I appreciate you for your knowledge and willingness to help us newbies. Unfortunately I know only enough about Linux to be dangerous to myself.

David

12/12/23, 6:07 PM

Did some more research. Found MANY users have problems with BT in kernel 5.15. for example: https://linuxreviews.org/Linux_Kernel_5.0.15_broke_Support_for_all_Older_Bluetooth_Devices_and_there%27s_no_fix_in_sight The "gurus" are saying downgrade to working kernel. 5.x kernel is EOL and not to expect any fixes for BT problem in it. We must all now wait patiently for new kernel and hope it works. Again, thanks!

Jeremy31

12/12/23, 10:05 PM

I haven't had a bluetooth issue in 5.15 with my Intel or Broadcom Bluetooth devices

David

12/13/23, 12:22 PM

There might be an issue between some (older?) BT adapters and kernel 5.15.0-56. I have now found some other websites (quoted you one) in which this seems to be the case. Maybe my BT HW is one of the things that does not work with 5.15.0-56. How can I tell which BT adapter I have? For right now my laptop is running ok. As the saying goes, never touch a running system.

David

12/13/23, 1:13 PM

ADDENDUM: I found some USB-BT dongles that are fairly recent and tried them on my notebook. They didn't work either when using the kernel 5.15.0-56. I am not knowledgeable enough to figure out why this kernel has problems with my BT. Or vice versa. Again thank you!

Jeremy31

12/13/23, 9:52 PM

Any result for `ls /lib/modules/5.15.0-56-generic/kernel/drivers/bluetooth | grep btusb` The btusb driver is needed for any USB Bluetooth device

Score:0

Ubuntu

aleksis_g

3/10/24, 10:16 AM

In my case helped next (Ubuntu 22.04, Thinkpad E14):

Install the Bluetooth drivers:

$ sudo apt-get install bluez

Load the btusb module into the kernel:

$ sudo modprobe btusb

Check the status of the btusb module:

$ sudo modprobe -n -v btusb

p.s. rebooting, BIOS manipulation - not helped previously

+ 0

Score:0

Ubuntu

Kuchiru

12/12/23, 8:04 AM

I have the same issues since 5.15.0-56, on boot my bluetooth service is inactive (dead) with the same message in the log below.

What works for me is to run sudo modprobe btusb and then sudo systemctl restart bluetooth.service

I have yet to find a permanent fix for this, not sure why this issue isn't more widespread.

+ 3

David

12/12/23, 5:41 PM

I have been being tutored by jeremy31. We have not found an answer for 5.15.0-56. I noticed in synaptic pkg mgr all BT packages referred to 5.15.0-53. I then booted linux with the 5.15.0-53 kernel and my BT service was active. Now we must find out what the difference between the two kernels is, as it relates to BT. Good luck!

Kuchiru

12/13/23, 8:25 PM

I found that it specifically has to do with the AX200 series chip, there are some bugs reported for this kernel (5.15) See: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1000403

David

12/15/23, 8:39 AM

How can I find out what chip my BT adapter (in laptop) has?

Elon Musk

I sit in a Tesla and translated this thread with Ai:

EN: Bluetooth Inactive (dead) Module btusb not found in directory /lib/modules/5.15.0-56

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