Analyzed the latest log files and came to following conclusion about that is going on here:
The key point here is that the car initiates the pairing with the phone which then leads to a timing problem in ubuntu-system-settings. But step by step: Feb 23 09:43:45 ubuntu-phablet bluetoothd[880]: src/adapter.c:device_found_callback() hci0 addr 84:38:35:62:28:DF, rssi -91 flags 0x0000 eir_len 72 Feb 23 09:43:45 ubuntu-phablet bluetoothd[880]: src/device.c:device_create() dst 84:38:35:62:28:DF Feb 23 09:43:45 ubuntu-phablet bluetoothd[880]: src/device.c:device_new() address 84:38:35:62:28:DF Feb 23 09:43:45 ubuntu-phablet bluetoothd[880]: src/device.c:device_new() Creating device /org/bluez/hci0/dev_84_38_35_62_28_DF Feb 23 09:43:45 ubuntu-phablet bluetoothd[880]: src/device.c:device_set_legacy() legacy 0 Feb 23 09:43:45 ubuntu-phablet bluetoothd[880]: src/device.c:device_set_rssi_with_delta() rssi -91 Feb 23 09:43:45 ubuntu-phablet bluetoothd[880]: src/device.c:btd_device_device_set_name() /org/bluez/hci0/dev_84_38_35_62_28_DF MacBook Air de Cristina Feb 23 09:43:45 ubuntu-phablet bluetoothd[880]: src/device.c:device_set_class() /org/bluez/hci0/dev_84_38_35_62_28_DF 0x38010C Here we see that bluez correctly finds the device and directly continues with an pairing attempt which it gets from the remote device Feb 23 09:43:46 ubuntu-phablet bluetoothd[880]: src/adapter.c:pin_code_request_callback() hci0 00:0A:30:B3:52:4B Feb 23 09:43:46 ubuntu-phablet bluetoothd[880]: src/device.c:device_create() dst 00:0A:30:B3:52:4B Feb 23 09:43:46 ubuntu-phablet bluetoothd[880]: src/device.c:device_new() address 00:0A:30:B3:52:4B Feb 23 09:43:46 ubuntu-phablet bluetoothd[880]: src/device.c:device_new() Creating device /org/bluez/hci0/dev_00_0A_30_B3_52_4B Feb 23 09:43:46 ubuntu-phablet bluetoothd[880]: src/device.c:new_auth() Requesting agent authentication for 00:0A:30:B3:52:4B Feb 23 09:43:46 ubuntu-phablet bluetoothd[880]: src/agent.c:agent_ref() 0xb7113930: ref=2 Feb 23 09:43:46 ubuntu-phablet bluetoothd[880]: src/agent.c:agent_ref() 0xb7113930: ref=3 So there is basically no time span between the phone detecting the device and getting the pairing request. BlueZ then sends out the pairing request to its registered agents: Feb 23 09:43:46 ubuntu-phablet bluetoothd[880]: Agent /com/canonical/SettingsBluetoothAgent/adapteragent replied with an error: org.bluez.Error.Rejected, The request was rejected: RequestPinCode Feb 23 09:43:46 ubuntu-phablet bluetoothd[880]: src/adapter.c:btd_adapter_pincode_reply() hci0 addr 00:0A:30:B3:52:4B pinlen 0 .. which gets denied from settings app as it doesn't have the device in its internal list yet. See https://bazaar.launchpad.net/~system- settings-touch/ubuntu-system- settings/trunk/view/head:/plugins/bluetooth/agent.cpp#L115 for details. We need to rework ubuntu-system-settings here to add the new device based on the object path it gets from bluez with the pairing request. ** Also affects: ubuntu-system-settings (Ubuntu) Importance: Undecided Status: New ** Changed in: bluez (Ubuntu) Status: Confirmed => Invalid ** Changed in: ubuntu-system-settings (Ubuntu) Status: New => Confirmed -- 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/1539158 Title: Unable to pair with in-car hands-free system after OTA-9 update Status in Canonical System Image: Confirmed Status in bluez package in Ubuntu: Invalid Status in ubuntu-system-settings package in Ubuntu: Confirmed Bug description: After OTA-9 I started having trouble with my bluetooth connection to the car hands-free system (no sound, and incoming calls no longer displayed the number), so I have reset both the car and the phone connections (eg. forgot the devices). Now I can't even pair the phone with the car's system. The car finds the phone, and then asks me to enter the code "0000" to pair the device, but after a few moments, it just says the connection failed and asks me to try again. Which fails again. It was working fine just before the update. Any logs I should post to help debug? PS - The car is a 2015 Honda Civic Tourer, if that matters. To manage notifications about this bug go to: https://bugs.launchpad.net/canonical-devices-system-image/+bug/1539158/+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
