With an AX210 card I get "Failed to send firmware data (-38)" on linux-next from Dec 4th in case of a cold-boot after power-cycle. "hk: bt code = 0x001f" is a private debug message to check which BT code is mapped to ENOSYS (-38). From what I found 0x1f is "Unspecified error". The second attempt to load the firmware is successful then. [ 4.192718] Bluetooth: Core ver 2.22 [ 4.192756] Bluetooth: Starting self testing [ 4.192785] Bluetooth: Finished self testing [ 4.192937] Bluetooth: HCI device and connection manager initialized [ 4.193067] Bluetooth: HCI socket layer initialized [ 4.193108] Bluetooth: L2CAP socket layer initialized [ 4.193195] Bluetooth: SCO socket layer initialized [ 4.242342] Bluetooth: hci0: Device revision is 0 [ 4.242435] Bluetooth: hci0: Secure boot is enabled [ 4.242495] Bluetooth: hci0: OTP lock is enabled [ 4.242533] Bluetooth: hci0: API lock is enabled [ 4.242570] Bluetooth: hci0: Debug lock is disabled [ 4.242609] Bluetooth: hci0: Minimum firmware build 1 week 10 2014 [ 4.242657] Bluetooth: hci0: Bootloader timestamp 2019.40 buildtype 1 build 38 [ 4.261977] Bluetooth: hci0: Found device firmware: intel/ibt-0041-0041.sfi [ 4.855813] Bluetooth: BNEP (Ethernet Emulation) ver 1.3 [ 4.855873] Bluetooth: BNEP socket layer initialized [ 5.819388] Bluetooth: hk: bt code = 0x001f [ 5.819438] Bluetooth: hci0: Failed to send firmware data (-38) [ 5.820069] Bluetooth: hci0: Intel reset sent to retry FW download [ 6.362248] Bluetooth: hci0: Device revision is 0 [ 6.362384] Bluetooth: hci0: Secure boot is enabled [ 6.362439] Bluetooth: hci0: OTP lock is enabled [ 6.362551] Bluetooth: hci0: API lock is enabled [ 6.362605] Bluetooth: hci0: Debug lock is disabled [ 6.362660] Bluetooth: hci0: Minimum firmware build 1 week 10 2014 [ 6.362726] Bluetooth: hci0: Bootloader timestamp 2019.40 buildtype 1 build 38 [ 6.364508] Bluetooth: hci0: Found device firmware: intel/ibt-0041-0041.sfi [ 9.020540] Bluetooth: hci0: Waiting for firmware download to complete [ 9.021443] Bluetooth: hci0: Firmware loaded in 2599136 usecs [ 9.022778] Bluetooth: hci0: Waiting for device to boot [ 9.050099] Bluetooth: hci0: Device booted in 27723 usecs [ 9.052633] Bluetooth: hci0: Found Intel DDC parameters: intel/ibt-0041-0041.ddc [ 9.055224] Bluetooth: hci0: Applying Intel DDC parameters completed [ 9.060184] Bluetooth: hci0: Firmware timestamp 2020.42 buildtype 1 build 15791
