https://bugzilla.kernel.org/show_bug.cgi?id=220344 --- Comment #6 from Tal Licht (tal.lich@xxxxxxxxx) --- I've also tried downgrading to the GA kernel (5.15). When I boot this the Wifi driver (iwlwifi) doesn't even load and my external USB-C monitor does not initialize at all. So using this is not an option :-) On Sun, 20 Jul 2025 at 14:30, Tal Lichtenstein <tal.lich@xxxxxxxxx> wrote: > Update - unfortunately Bluetooth did start disconnecting, it only took a > bit longer this time. So no improvement even after downgrading the firmware > :( > > [ 4945.041226] Bluetooth: hci0: Hardware error 0x0c > [ 4945.055323] Bluetooth: hci0: Retrieving Intel exception info failed > (-16) > [ 5413.818394] Bluetooth: hci0: Hardware error 0x0c > [ 5413.832258] Bluetooth: hci0: Retrieving Intel exception info failed > (-16) > [ 6078.608374] Bluetooth: hci0: Hardware error 0x0c > [ 6078.622543] Bluetooth: hci0: Retrieving Intel exception info failed > (-16) > [ 6154.472547] Bluetooth: hci0: Hardware error 0x0c > [ 6154.486464] Bluetooth: hci0: Retrieving Intel exception info failed > (-16) > [ 6323.107517] Bluetooth: hci0: Hardware error 0x0c > [ 6323.121611] Bluetooth: hci0: Retrieving Intel exception info failed > (-16) > [ 9253.552312] Bluetooth: hci0: Hardware error 0x0c > [ 9253.566433] Bluetooth: hci0: Retrieving Intel exception info failed > (-16) > [10010.348140] Bluetooth: hci0: link tx timeout > [10010.348160] Bluetooth: hci0: killing stalled connection > 38:18:4c:be:34:1d > [10371.646448] Bluetooth: hci0: Hardware error 0x0a > [10371.660506] Bluetooth: hci0: Retrieving Intel exception info failed > (-16) > [10547.126313] Bluetooth: hci0: Hardware error 0x0c > [10547.140440] Bluetooth: hci0: Retrieving Intel exception info failed > (-16) > [10602.005441] Bluetooth: hci0: Hardware error 0x0a > [10602.019402] Bluetooth: hci0: Retrieving Intel exception info failed > (-16) > [11660.598378] Bluetooth: hci0: Hardware error 0x0a > [11660.612383] Bluetooth: hci0: Retrieving Intel exception info failed > (-16) > > On Sun, 20 Jul 2025 at 12:02, Tal Lichtenstein <tal.lich@xxxxxxxxx> wrote: > >> 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.
