It looks like that function is pretty close to the kernel so this is probably due to some kernel change.
Can you please try some older kernels and see if you can find any without the bug? https://kernel.ubuntu.com/~kernel-ppa/mainline/?C=M;O=D ** Tags added: focal ** Also affects: linux (Ubuntu) Importance: Undecided Status: New ** Summary changed: - Ubuntu 20.04 (focal): hcitool lescan broken + hcitool lescan says 'Set scan parameters failed: Input/output error' -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to bluez in Ubuntu. https://bugs.launchpad.net/bugs/1870837 Title: hcitool lescan says 'Set scan parameters failed: Input/output error' Status in bluez package in Ubuntu: New Status in linux package in Ubuntu: New Bug description: Hi, after some testing with Ubuntu 20.04 beta I couldn't get hcitool lescan working. I get the following error: hcitool lescan Set scan parameters failed: Input/output error Bluetooth hardware: hci0: Type: Primary Bus: USB BD Address: 04:EA:56:21:xx:xx ACL MTU: 1021:4 SCO MTU: 96:6 UP RUNNING RX bytes:1605 acl:0 sco:0 events:123 errors:0 TX bytes:5801 acl:0 sco:0 commands:123 errors:0 Features: 0xbf 0xfe 0x0f 0xfe 0xdb 0xff 0x7b 0x87 Packet type: DM1 DM3 DM5 DH1 DH3 DH5 HV1 HV2 HV3 Link policy: RSWITCH SNIFF Link mode: SLAVE ACCEPT Name: 'xx' Class: 0x200104 Service Classes: Audio Device Class: Computer, Desktop workstation HCI Version: 5.1 (0xa) Revision: 0x100 LMP Version: 5.1 (0xa) Subversion: 0x100 Manufacturer: Intel Corp. (2) It is not hardware related, since I get the same error with a USB bluetooth dongle: hcitool -i hci1 lescan Set scan parameters failed: Input/output error hcitool scan is working fine on both devices; bluetoothctl is also working and able to find ble devices. I would normally prefer bluetoothctl, but I got a software which is based on hcitool. dmesg shows this errors: [ 138.152718] debugfs: File 'le_min_key_size' in directory 'hci0' already present! [ 138.152722] debugfs: File 'le_max_key_size' in directory 'hci0' already present! Bluez version: bluez 5.53-0ubuntu2 amd64 System: Distributor ID: Ubuntu Description: Ubuntu Focal Fossa (development branch) Release: 20.04 Codename: focal To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/bluez/+bug/1870837/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
