我的蓝牙连接不断中断，这给我带来了一些问题。芯片组是 Broadcom BCM20702A0（可插拔 USB 2.0 蓝牙适配器）http://goo.gl/h42upl) 配对前后，设备每 3 秒出现一次然后消失一次。我查看了很多论坛，但还没有找到解决方案。
我正在使用 Ubuntu 14.04，错误和 WiFi 加密狗详细信息如下：
dmesg | grep blue 的部分输出：
[62829.136734] WARNING: CPU: 4 PID: 7002 at /build/linux-lts-utopic-3gKELT/linux-lts-utopic-3.16.0/net/bluetooth/hci_conn.c:296 hci_conn_timeout+0x75/0x2a0 [bluetooth]()
无线信息 (http://goo.gl/t5FPss)：
########## wireless info START ##########
Report from: 16 Jan 2016 11:35 GMT +0000
Booted last: 15 Jan 2016 18:16 GMT +0000
Script from: 27 Sep 2015 00:34 UTC +0000
##### release ###########################
Distributor ID: Ubuntu
Description: Ubuntu 14.04.3 LTS
Release: 14.04
Codename: trusty
##### kernel ############################
Linux 3.16.0-57-generic #77~14.04.1-Ubuntu SMP Thu Dec 17 23:20:00 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
Parameters: ro, quiet, splash, vt.handoff=7
##### desktop ###########################
Ubuntu
##### lspci #############################
00:19.0 Ethernet controller [0200]: Intel Corporation Ethernet Connection I217-V [8086:153b]
Subsystem: Gigabyte Technology Co., Ltd Device [1458:e000]
Kernel driver in use: e1000e
03:00.0 Ethernet controller [0200]: Qualcomm Atheros Killer E2200 Gigabit Ethernet Controller [1969:e091] (rev 10)
Subsystem: Gigabyte Technology Co., Ltd Device [1458:e000]
Kernel driver in use: alx
##### lsusb #############################
Bus 002 Device 002: ID 8087:8001 Intel Corp.
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 002: ID 8087:8009 Intel Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 003: ID 11b0:6348 ATECH FLASH TECHNOLOGY
Bus 004 Device 002: ID 045b:0210 Hitachi, Ltd
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 005: ID 0a5c:21e8 Broadcom Corp. BCM20702A0 Bluetooth 4.0
Bus 003 Device 004: ID 2516:0011
Bus 003 Device 002: ID 045b:0209 Hitachi, Ltd
Bus 003 Device 003: ID 046d:c52b Logitech, Inc. Unifying Receiver
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
##### PCMCIA card info ##################
##### rfkill ############################
0: hci0: Bluetooth
Soft blocked: no
Hard blocked: no
##### lsmod #############################
mxm_wmi 13021 0
snd_soc_rt5640 93124 0
snd_soc_rl6231 13037 1 snd_soc_rt5640
snd_soc_core 200418 1 snd_soc_rt5640
snd_pcm 104112 7 snd_soc_rt5640,snd_soc_core,snd_hda_codec_hdmi,snd_hda_codec,snd_hda_intel,snd_hda_controller,snd_pcm_dmaengine
wmi 19193 1 mxm_wmi
##### interfaces ########################
auto lo
iface lo inet loopback
##### ifconfig ##########################
eth0 Link encap:Ethernet HWaddr <MAC 'eth0' [IF]>
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
Interrupt:18
eth1 Link encap:Ethernet HWaddr <MAC 'eth1' [IF]>
inet addr:192.168.1.101 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::<IP6 'eth1' [IF]>/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:985193 errors:0 dropped:0 overruns:0 frame:0
TX packets:704578 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:1173587124 (1.1 GB) TX bytes:101507245 (101.5 MB)
Interrupt:20 Memory:f7300000-f7320000
##### iwconfig ##########################
eth0 no wireless extensions.
eth1 no wireless extensions.
lo no wireless extensions.
##### route #############################
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 192.168.1.254 0.0.0.0 UG 0 0 0 eth1
192.168.1.0 0.0.0.0 255.255.255.0 U 1 0 0 eth1
##### resolv.conf #######################
nameserver 127.0.1.1
search home.gateway
##### network managers ##################
Installed:
NetworkManager
Running:
root 1311 1 0 Jan15 ? 00:00:00 NetworkManager
##### NetworkManager info ###############
NetworkManager Tool
State: connected (global)
- Device: <MAC address> ----------------------------------------------------
Type: Bluetooth
Driver: bluez
State: disconnected
Default: no
Capabilities:
- Device: eth0 -----------------------------------------------------------------
Type: Wired
Driver: alx
State: unavailable
Default: no
HW Address: <MAC 'eth0' [IF]>
Capabilities:
Carrier Detect: yes
Wired Properties
Carrier: off
- Device: eth1 [Wired connection 1] -------------------------------------------
Type: Wired
Driver: e1000e
State: connected
Default: yes
HW Address: <MAC 'eth1' [IF]>
Capabilities:
Carrier Detect: yes
Speed: 1000 Mb/s
Wired Properties
Carrier: on
IPv4 Settings:
Address: 192.168.1.101
Prefix: 24 (255.255.255.0)
Gateway: 192.168.1.254
DNS: 192.168.1.254
##### NetworkManager.state ##############
[main]
NetworkingEnabled=true
WirelessEnabled=true
WWANEnabled=true
WimaxEnabled=true
##### NetworkManager.conf ###############
[main]
plugins=ifupdown,keyfile,ofono
dns=dnsmasq
[ifupdown]
managed=false
##### NetworkManager profiles ###########
##### iw reg get ########################
Region: Europe/London (based on set time zone)
country 00:
(2402 - 2472 @ 40), (6, 20)
(2457 - 2482 @ 40), (6, 20), PASSIVE-SCAN
(2474 - 2494 @ 20), (6, 20), NO-OFDM, PASSIVE-SCAN
(5170 - 5250 @ 160), (6, 20), PASSIVE-SCAN
(5250 - 5330 @ 160), (6, 20), DFS, PASSIVE-SCAN
(5490 - 5730 @ 160), (6, 20), DFS, PASSIVE-SCAN
##### iwlist channels ###################
eth0 no frequency information.
eth1 no frequency information.
lo no frequency information.
##### iwlist scan #######################
eth0 Interface doesn't support scanning.
eth1 Interface doesn't support scanning.
lo Interface doesn't support scanning.
##### module infos ######################
##### module parameters #################
##### /etc/modules ######################
lp
rtc
##### modprobe options ##################
[/etc/modprobe.d/blacklist-ath_pci.conf]
blacklist ath_pci
[/etc/modprobe.d/blacklist.conf]
blacklist evbug
blacklist usbmouse
blacklist usbkbd
blacklist eepro100
blacklist de4x5
blacklist eth1394
blacklist snd_intel8x0m
blacklist snd_aw2
blacklist i2c_i801
blacklist prism54
blacklist bcm43xx
blacklist garmin_gps
blacklist asus_acpi
blacklist snd_pcsp
blacklist pcspkr
blacklist amd76x_edac
[/etc/modprobe.d/blacklist-rare-network.conf]
alias net-pf-3 off
alias net-pf-6 off
alias net-pf-9 off
alias net-pf-11 off
alias net-pf-12 off
alias net-pf-19 off
alias net-pf-21 off
alias net-pf-36 off
[/etc/modprobe.d/iwlwifi.conf]
remove iwlwifi \
(/sbin/lsmod | grep -o -e ^iwlmvm -e ^iwldvm -e ^iwlwifi | xargs /sbin/rmmod) \
&& /sbin/modprobe -r mac80211
[/etc/modprobe.d/mlx4.conf]
softdep mlx4_core post: mlx4_en
[/etc/modprobe.d/modesetting.conf]
options cirrus modeset=1
options mgag200 modeset=1
##### rc.local ##########################
exit 0
##### pm-utils ##########################
##### udev rules ########################
[/etc/udev/rules.d/70-persistent-net.rules]
# PCI device 0x8086:0x153b (e1000e)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="<MAC 'eth1' [IF]>", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="eth*", NAME="eth1"
# PCI device 0x1969:0xe091 (alx)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="<MAC 'eth0' [IF]>", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0"
##### dmesg #############################
[ 29.884969] IPv6: ADDRCONF(NETDEV_UP): eth1: link is not ready
[ 29.890551] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
[ 32.847170] e1000e: eth1 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: Rx/Tx
[ 32.847197] IPv6: ADDRCONF(NETDEV_CHANGE): eth1: link becomes ready
[62390.180812] Bluetooth: hci0: BCM: firmware hci_ver=06 hci_rev=153a lmp_ver=06 lmp_subver=220e
########## wireless info END ############
答案1
看起来像是一个内核错误（例如RedHat Bugzilla)，报告中写道：
我于2015-02-10报告的错误是在3.17.8-200.fc20内核上运行的。
我后来升级到了 3.18.5-101.fc20 和 3.18.7-100.fc20。事实上，从那以后我就没再遇到过同样的错误。
所以建议尝试更新的内核。
答案2
经过一些测试，我将问题缩小到 BlueProximity 1.2.5-6。删除后问题就解决了。我还在 Ubuntu 15.04 上进行了测试，安装 BlueProximity 后也出现了同样的问题，因此排除了 Kernal 错误。