https://bugzilla.kernel.org/show_bug.cgi?id=220344 --- Comment #4 from Tal Licht (tal.lich@xxxxxxxxx) --- I've tried going back to the bluetooth firmware that was current at the date the computer was originally installed - 9/Sep/2023. On this date, these firmware files were current: ibt-0040-0041.sfi - commit 555452997994b250477de4a03b322dc53513d05a dated 2023-08-28 ibt-0040-0041.ddc - commit b7e0c80b00bb4e3d4c845f2270c5c0c8262154ca dated 2021-09-15 iwlwifi-so-a0-gf-a0-86.ucode - commit f27dec616e29e44cd90645926c1459639d112c3d dated 2023-11-16 - *this is still the current version today* I switched the files in /lib/firmware to these versions and rebooted: root@licht-t14s:~# dmesg | grep -E '(hci0|iwlwifi)' [ 30.809390] iwlwifi 0000:00:14.3: enabling device (0000 -> 0002) [ 30.830430] iwlwifi 0000:00:14.3: Detected crf-id 0x400410, cnv-id 0x80400 wfpm id 0x80000020 [ 30.830491] iwlwifi 0000:00:14.3: PCI dev 51f1/0090, rev=0x370, rfid=0x2010d000 [ 30.835929] iwlwifi 0000:00:14.3: TLV_FW_FSEQ_VERSION: FSEQ Version: 0.0.2.41 *[ 30.836818] iwlwifi 0000:00:14.3: loaded firmware version 86.fb5c9aeb.0 so-a0-gf-a0-86.ucode op_mode iwlmvm* [ 30.839236] Bluetooth: hci0: Device revision is 0 [ 30.839241] Bluetooth: hci0: Secure boot is enabled [ 30.839242] Bluetooth: hci0: OTP lock is enabled [ 30.839243] Bluetooth: hci0: API lock is enabled [ 30.839244] Bluetooth: hci0: Debug lock is disabled [ 30.839245] Bluetooth: hci0: Minimum firmware build 1 week 10 2014 [ 30.839246] Bluetooth: hci0: Bootloader timestamp 2019.40 buildtype 1 build 38 [ 30.840962] Bluetooth: hci0: DSM reset method type: 0x00 *[ 30.844291] Bluetooth: hci0: Found device firmware: intel/ibt-0040-0041.sfi* [ 30.844304] Bluetooth: hci0: Boot Address: 0x100800 *[ 30.844305] Bluetooth: hci0: Firmware Version: 254-28.23* [ 30.982422] iwlwifi 0000:00:14.3: Detected Intel(R) Wi-Fi 6E AX211 160MHz, REV=0x370 [ 31.158040] iwlwifi 0000:00:14.3: WFPM_UMAC_PD_NOTIFICATION: 0x20 [ 31.158093] iwlwifi 0000:00:14.3: WFPM_LMAC2_PD_NOTIFICATION: 0x1f [ 31.158101] iwlwifi 0000:00:14.3: WFPM_AUTH_KEY_0: 0x90 [ 31.158109] iwlwifi 0000:00:14.3: CNVI_SCU_SEQ_DATA_DW9: 0x0 [ 31.158396] iwlwifi 0000:00:14.3: loaded PNVM version e28bb9d7 [ 31.159564] iwlwifi 0000:00:14.3: RFIm is deactivated, reason = 4 [ 31.174653] iwlwifi 0000:00:14.3: Detected RF GF, rfid=0x2010d000 [ 31.244329] iwlwifi 0000:00:14.3: base HW address: 10:f6:0a:05:ba:09 [ 31.260051] iwlwifi 0000:00:14.3: iwlmvm doesn't allow to disable BT Coex, check bt_coex_active module parameter [ 31.294784] iwlwifi 0000:00:14.3 wlp0s20f3: renamed from wlan0 [ 31.793193] iwlwifi 0000:00:14.3: WFPM_UMAC_PD_NOTIFICATION: 0x20 [ 31.793252] iwlwifi 0000:00:14.3: WFPM_LMAC2_PD_NOTIFICATION: 0x1f [ 31.793260] iwlwifi 0000:00:14.3: WFPM_AUTH_KEY_0: 0x90 [ 31.793269] iwlwifi 0000:00:14.3: CNVI_SCU_SEQ_DATA_DW9: 0x0 [ 31.794692] iwlwifi 0000:00:14.3: RFIm is deactivated, reason = 4 [ 31.892352] iwlwifi 0000:00:14.3: Registered PHC clock: iwlwifi-PTP, with index: 0 [ 32.392539] Bluetooth: hci0: Waiting for firmware download to complete [ 32.393277] Bluetooth: hci0: Firmware loaded in 1512675 usecs [ 32.393369] Bluetooth: hci0: Waiting for device to boot [ 32.409352] Bluetooth: hci0: Device booted in 15680 usecs *[ 32.409513] Bluetooth: hci0: Found Intel DDC parameters: intel/ibt-0040-0041.ddc* [ 32.412401] Bluetooth: hci0: Applying Intel DDC parameters completed *[ 32.415476] Bluetooth: hci0: Firmware timestamp 2023.28 buildtype 1 build 68350* [ 32.415482] Bluetooth: hci0: Firmware SHA1: 0xc64314a8 [ 32.587297] Bluetooth: hci0: Bad flag given (0x1) vs supported (0x0) [ 32.587398] Bluetooth: hci0: Bad flag given (0x1) vs supported (0x0) [ 32.587484] Bluetooth: hci0: Bad flag given (0x1) vs supported (0x0) [ 32.587627] Bluetooth: hci0: Bad flag given (0x1) vs supported (0x0) Bluetooth keyboard, mouse and headphones connected automatically. I then proceeded to play some music in Spotify which in my experience shortens the time until the disconnection issue happens. Sure enough after less than 1 minute I started hearing bluetooth sound hiccups which indicate a problem with the bluetooth connection. These repeat occasionally. ***However**, *the devices DID NOT disconnect even after 1 hour of continuous use and I did not see the error message I did with the newer firmware: kernel: Bluetooth: hci0: Hardware error 0x0c So this is already some improvement. What I can also try is to downgrade the kernel from the HWE version (6.8) to the GA version (5.15) and see if that helps. I'll try that later once I have a grip I know what I'm doing :-) On Sat, 19 Jul 2025 at 16:36, Tal Lichtenstein <tal.lich@xxxxxxxxx> wrote: > I think this is not the same bug as 220341 - that bug reports the stack > crashing and Bluetooth becoming disabled. This is not the case here - it > just causes devices to disconnect periodically. I suspect the firmware is > crashing and restarting but have no way to verify this. I will try however > to switch to some older firmware and see if this stops. Will report the > results. > > On Sat, Jul 19, 2025, 15:06 <bugzilla-daemon@xxxxxxxxxx> wrote: > >> https://bugzilla.kernel.org/show_bug.cgi?id=220344 >> >> --- Comment #2 from Paul Menzel ( >> pmenzel+bugzilla.kernel.org@xxxxxxxxxxxxx) --- >> Was the Linux firmware updated on your system, so you actually need to >> test an >> *older* firmware version? >> >> -- >> You may reply to this email to add a comment. >> >> You are receiving this mail because: >> You reported the bug. > > -- You may reply to this email to add a comment. You are receiving this mail because: You are the assignee for the bug.
