当笔记本电脑因无活动而进入睡眠状态时，我将蓝牙耳机连接到笔记本电脑。当我重新打开它时，蓝牙无法工作。即菜单栏上没有蓝牙图标，蓝牙管理器 blueman 呈灰色，并弹出错误“未找到适配器”。
我尝试重新安装 blueman、pulseaudio、最新的 linux 内核、固件等，但这些解决方案似乎都无法让蓝牙再次工作。
蓝牙未显示在rfkill list all
0: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
sudo lshw -C network输出：
*-network
description: Wireless interface
product: QCA6174 802.11ac Wireless Network Adapter
vendor: Qualcomm Atheros
physical id: 0
bus info: pci@0000:3a:00.0
logical name: wlp58s0
version: 32
serial: 9c:b6:d0:f1:43:cd
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
configuration: broadcast=yes driver=ath10k_pci driverversion=4.15.0-041500rc6-lowlatency firmware=WLAN.RM.4.4.1-00051-QCARMSWP-1 ip=192.168.1.2 latency=0 link=yes multicast=yes wireless=IEEE 802.11
resources: irq:135 memory:dc000000-dc1fffff
lspci输出：
00:00.0 Host bridge: Intel Corporation Device 5904 (rev 02)
00:02.0 VGA compatible controller: Intel Corporation Device 5916 (rev 02)
00:04.0 Signal processing controller: Intel Corporation Skylake Processor Thermal Subsystem (rev 02)
00:14.0 USB controller: Intel Corporation Sunrise Point-LP USB 3.0 xHCI Controller (rev 21)
00:14.2 Signal processing controller: Intel Corporation Sunrise Point-LP Thermal subsystem (rev 21)
00:15.0 Signal processing controller: Intel Corporation Sunrise Point-LP Serial IO I2C Controller (rev 21)
00:15.1 Signal processing controller: Intel Corporation Sunrise Point-LP Serial IO I2C Controller (rev 21)
00:16.0 Communication controller: Intel Corporation Sunrise Point-LP CSME HECI (rev 21)
00:1c.0 PCI bridge: Intel Corporation Device 9d10 (rev f1)
00:1c.4 PCI bridge: Intel Corporation Sunrise Point-LP PCI Express Root Port (rev f1)
00:1c.5 PCI bridge: Intel Corporation Sunrise Point-LP PCI Express Root Port (rev f1)
00:1d.0 PCI bridge: Intel Corporation Device 9d18 (rev f1)
00:1f.0 ISA bridge: Intel Corporation Device 9d58 (rev 21)
00:1f.2 Memory controller: Intel Corporation Sunrise Point-LP PMC (rev 21)
00:1f.3 Audio device: Intel Corporation Device 9d71 (rev 21)
00:1f.4 SMBus: Intel Corporation Sunrise Point-LP SMBus (rev 21)
3a:00.0 Network controller: Qualcomm Atheros QCA6174 802.11ac Wireless Network Adapter (rev 32)
3b:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS525A PCI Express Card Reader (rev 01)
3c:00.0 Non-Volatile memory controller: Toshiba America Info Systems Device 0116
uname -a输出：
Linux Barad-dur 4.15.0-041500rc6-lowlatency #201712312330 SMP PREEMPT Sun Dec 31 23:33:42 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
lsmod | grep bluetooth; dmesg | egrep -i 'blue|firm'输出：
bluetooth 544768 13 btrtl,btintel,bnep,btbcm,btusb
ecdh_generic 24576 1 bluetooth
[ 0.073891] ACPI: [Firmware Bug]: BIOS _OSI(Linux) query ignored
[ 0.922677] [drm] Finished loading DMC firmware i915/kbl_dmc_ver1_01.bin (v1.1)
[ 3.244634] Bluetooth: Core ver 2.22
[ 3.244888] Bluetooth: HCI device and connection manager initialized
[ 3.244892] Bluetooth: HCI socket layer initialized
[ 3.244894] Bluetooth: L2CAP socket layer initialized
[ 3.244899] Bluetooth: SCO socket layer initialized
[ 4.584150] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[ 4.584151] Bluetooth: BNEP filters: protocol multicast
[ 4.584155] Bluetooth: BNEP socket layer initialized
[ 7.352205] platform regulatory.0: Direct firmware load for regulatory.db failed with error -2
[ 7.576028] ath10k_pci 0000:3a:00.0: Direct firmware load for ath10k/pre-cal-pci-0000:3a:00.0.bin failed with error -2
[ 7.576034] ath10k_pci 0000:3a:00.0: Direct firmware load for ath10k/cal-pci-0000:3a:00.0.bin failed with error -2
[ 7.578921] ath10k_pci 0000:3a:00.0: firmware ver WLAN.RM.4.4.1-00051-QCARMSWP-1 api 6 features wowlan,ignore-otp crc32 c3fd4411
我将非常感激任何能够使蓝牙正常工作的帮助。
编辑：
就像它随机停止工作一样，现在它又随机开始工作了，我不知道为什么。但我想，只要它能工作，我就不会抱怨。
答案1
看看这个答案，Dell XPS 13 (9370) 蓝牙问题
从电源上移除我的 XPS 15 9560，然后关闭盖子（暂停），然后在几分钟后恢复，这似乎是恢复蓝牙的最佳方法。