这是我的故事：我想启动 Windows，但我忘了在 grub 上选择，所以它进入了 Ubuntu。我自然而然地重新启动（没有登录 Ubuntu），但它停止了，如下所示：
我只好强制关机并再次尝试，结果问题依旧，错误信息如下：
[12.771190] Bluetooth: hci0 sending Intel patch command(0xfc8e) failed (-110)
[12.771242] Bluetooth: hci0 sending frame failed(-19)
[14.786774] Bluetooth: Exiting manufacturer mode failed(-110)
我的平台是 Ubuntu 16.04 LTS，内核是 4.10.0-42-generic。但奇怪的是，我登录 Ubuntu 后重启工作正常。以下是我的设备和显卡驱动程序的信息：
finley@finley:~$ lspci -vnn | grep VGA -A 12
00:02.0 VGA compatible controller [0300]: Intel Corporation Device [8086:1906] (rev 07) (prog-if 00 [VGA controller])
Subsystem: Lenovo Device [17aa:5049]
Flags: bus master, fast devsel, latency 0, IRQ 125
Memory at f0000000 (64-bit, non-prefetchable) [size=16M]
Memory at e0000000 (64-bit, prefetchable) [size=256M]
I/O ports at 4000 [size=64]
[virtual] Expansion ROM at 000c0000 [disabled] [size=128K]
Capabilities: <access denied>
Kernel driver in use: i915
Kernel modules: i915
00:14.0 USB controller [0c03]: Intel Corporation Sunrise Point-LP USB 3.0 xHCI Controller [8086:9d2f] (rev 21) (prog-if 30 [XHCI])
Subsystem: Lenovo Sunrise Point-LP USB 3.0 xHCI Controller [17aa:5048]
