目前安装了英特尔 AC 9260，当 Ubuntu 18.10 内核 4.20.4 启动时，我没有活动的蓝牙控制器。有趣的是，如果我将笔记本电脑置于睡眠状态然后将其唤醒，蓝牙可以正常工作。我希望将其设置为在全新启动后蓝牙可以立即工作的程度。
uname -a
Linux tp-ThinkPad-E485 4.20.4-042004-generic #201901222207 SMP Tue Jan 22 22:09:25 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
$ rfkill list
0: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
1: hci0: Bluetooth
Soft blocked: no
Hard blocked: no
全新启动后，以下是 dmesg 输出（蓝牙不工作）
$ dmesg | egrep -i 'blue|firm'
[ 0.356392] ACPI: [Firmware Bug]: BIOS _OSI(Linux) query ignored
[ 0.398494] acpi PNP0A08:00: [Firmware Info]: MMCONFIG for domain 0000 [bus 00-3f] only partially covers this bridge
[ 2.881280] Bluetooth: Core ver 2.22
[ 2.881309] Bluetooth: HCI device and connection manager initialized
[ 2.881330] Bluetooth: HCI socket layer initialized
[ 2.881333] Bluetooth: L2CAP socket layer initialized
[ 2.881340] Bluetooth: SCO socket layer initialized
[ 2.911239] iwlwifi 0000:04:00.0: loaded firmware version 41.fc1a7aea.0 op_mode iwlmvm
[ 3.132551] [drm] Found VCN firmware Version: 1.73 Family ID: 18
[ 3.132575] [drm] PSP loading VCN firmware
[ 3.311586] psmouse serio2: trackpoint: Elan TrackPoint firmware: 0x11, buttons: 3/3
[ 5.448940] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[ 5.448943] Bluetooth: BNEP filters: protocol multicast
[ 5.448949] Bluetooth: BNEP socket layer initialized
[ 264.225261] Bluetooth: hci0: Bootloader revision 0.1 build 42 week 52 2015
[ 264.228259] Bluetooth: hci0: Device revision is 2
[ 264.228262] Bluetooth: hci0: Secure boot is enabled
[ 264.228264] Bluetooth: hci0: OTP lock is enabled
[ 264.228265] Bluetooth: hci0: API lock is enabled
[ 264.228267] Bluetooth: hci0: Debug lock is disabled
[ 264.228269] Bluetooth: hci0: Minimum firmware build 1 week 10 2014
[ 264.232137] Bluetooth: hci0: Found device firmware: intel/ibt-18-16-1.sfi
[ 265.541066] Bluetooth: hci0: Waiting for firmware download to complete
[ 265.541967] Bluetooth: hci0: Firmware loaded in 1289556 usecs
[ 265.542126] Bluetooth: hci0: Waiting for device to boot
[ 265.557996] Bluetooth: hci0: Device booted in 15574 usecs
[ 265.560048] Bluetooth: hci0: Found Intel DDC parameters: intel/ibt-18-16-1.ddc
[ 265.571987] Bluetooth: hci0: Applying Intel DDC parameters completed
[ 265.753188] Bluetooth: RFCOMM TTY layer initialized
[ 265.753194] Bluetooth: RFCOMM socket layer initialized
[ 265.753199] Bluetooth: RFCOMM ver 1.11
[ 266.018950] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 282.146608] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 285.107849] Bluetooth: HIDP (Human Interface Emulation) ver 1.2
[ 285.107856] Bluetooth: HIDP socket layer initialized
[ 285.115102] input: MagicMouse as /devices/pci0000:00/0000:00:08.1/0000:05:00.4/usb3/3-1/3-1:1.0/bluetooth/hci0/hci0:256/0005:05AC:030D.0001/input/input16
[ 285.115312] magicmouse 0005:05AC:030D.0001: input,hidraw0: BLUETOOTH HID v3.06 Mouse [MagicMouse] on fc:77:74:eb:f6:2b
重新启动后，dmesg 输出如下
$ dmesg | egrep -i 'blue|firm'
[ 0.360983] ACPI: [Firmware Bug]: BIOS _OSI(Linux) query ignored
[ 0.399197] acpi PNP0A08:00: [Firmware Info]: MMCONFIG for domain 0000 [bus 00-3f] only partially covers this bridge
[ 2.848124] Bluetooth: Core ver 2.22
[ 2.848200] Bluetooth: HCI device and connection manager initialized
[ 2.848209] Bluetooth: HCI socket layer initialized
[ 2.848214] Bluetooth: L2CAP socket layer initialized
[ 2.848221] Bluetooth: SCO socket layer initialized
[ 2.872284] Bluetooth: hci0: Firmware revision 0.1 build 130 week 44 2018
[ 2.880174] iwlwifi 0000:04:00.0: loaded firmware version 41.fc1a7aea.0 op_mode iwlmvm
[ 3.131527] [drm] Found VCN firmware Version: 1.73 Family ID: 18
[ 3.131539] [drm] PSP loading VCN firmware
[ 3.331119] psmouse serio2: trackpoint: Elan TrackPoint firmware: 0x11, buttons: 3/3
[ 4.183050] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[ 4.183053] Bluetooth: BNEP filters: protocol multicast
[ 4.183060] Bluetooth: BNEP socket layer initialized
[ 4.966475] Bluetooth: hci0: command 0x0c16 tx timeout
[ 4.966518] Bluetooth: hci0: sending frame failed (-19)
[ 6.986553] Bluetooth: hci0: command 0x2002 tx timeout
[ 6.987687] Bluetooth: hci0: sending frame failed (-19)
[ 8.998502] Bluetooth: hci0: command 0x2003 tx timeout
[ 8.998542] Bluetooth: hci0: sending frame failed (-19)
[ 11.014554] Bluetooth: hci0: command 0x201c tx timeout
[ 11.014600] Bluetooth: hci0: sending frame failed (-19)
[ 13.030511] Bluetooth: hci0: command 0x1002 tx timeout
[ 13.030637] Bluetooth: hci0: sending frame failed (-19)