%20BCM43142%20.png)
我的戴尔笔记本电脑运行 Debian 8 (Jessie)，具有以下无线设备：
$ lspci -nn -d 14e4:
02:00.0 Network controller [0280]: Broadcom Corporation BCM43142 802.11b/g/n [14e4:4365] (rev 01)
而且偶尔也能正常工作。今天它工作得很好：
64 bytes from 8.8.8.8: icmp_seq=5168 ttl=57 time=24.6 ms
64 bytes from 8.8.8.8: icmp_seq=5169 ttl=57 time=24.5 ms
64 bytes from 8.8.8.8: icmp_seq=5170 ttl=57 time=24.4 ms
64 bytes from 8.8.8.8: icmp_seq=5171 ttl=57 time=24.8 ms
64 bytes from 8.8.8.8: icmp_seq=5172 ttl=57 time=28.6 ms
但每隔一段时间（也许每十分钟），它就会开始丢包，然后完全堵塞：
64 bytes from 8.8.8.8: icmp_seq=4631 ttl=57 time=28.7 ms
64 bytes from 8.8.8.8: icmp_seq=4633 ttl=57 time=27.8 ms
64 bytes from 8.8.8.8: icmp_seq=4642 ttl=57 time=25.6 ms
64 bytes from 8.8.8.8: icmp_seq=4651 ttl=57 time=24.6 ms
64 bytes from 8.8.8.8: icmp_seq=4652 ttl=57 time=24.4 ms
64 bytes from 8.8.8.8: icmp_seq=4657 ttl=57 time=23.6 ms
ping: sendmsg: Network is unreachable
此时，我做
sudo rmmod wl && sudo modprobe wl
猛拉并重新安装无线驱动程序，然后就又好了：
64 bytes from 8.8.8.8: icmp_seq=4681 ttl=57 time=38.0 ms
64 bytes from 8.8.8.8: icmp_seq=4682 ttl=57 time=26.1 ms
64 bytes from 8.8.8.8: icmp_seq=4683 ttl=57 time=23.9 ms
64 bytes from 8.8.8.8: icmp_seq=4684 ttl=57 time=24.4 ms
这似乎有点次优，有人知道如何使其正常工作吗？
---- 编辑：所以我现在使用：
sudo rmmod wl && sudo modprobe wl && sudo iwconfig wlan0 power off
重置这个可怜的东西，这会导致
[Mon Feb 1 17:32:41 2016 < 0.000000>] wl0: link down (wlan0)
[Mon Feb 1 17:32:41 2016 < 0.034491>] cfg80211: Calling CRDA to update world regulatory domain
[Mon Feb 1 17:32:41 2016 < 0.006586>] cfg80211: World regulatory domain updated:
[Mon Feb 1 17:32:41 2016 < 0.000005>] cfg80211: DFS Master region: unset
[Mon Feb 1 17:32:41 2016 < 0.000003>] cfg80211: (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp), (dfs_cac_time)
[Mon Feb 1 17:32:41 2016 < 0.000004>] cfg80211: (2402000 KHz - 2472000 KHz @ 40000 KHz), (N/A, 2000 mBm), (N/A)
[Mon Feb 1 17:32:41 2016 < 0.000003>] cfg80211: (2457000 KHz - 2482000 KHz @ 40000 KHz), (N/A, 2000 mBm), (N/A)
[Mon Feb 1 17:32:41 2016 < 0.000002>] cfg80211: (2474000 KHz - 2494000 KHz @ 20000 KHz), (N/A, 2000 mBm), (N/A)
[Mon Feb 1 17:32:41 2016 < 0.000004>] cfg80211: (5170000 KHz - 5250000 KHz @ 80000 KHz, 160000 KHz AUTO), (N/A, 2000 mBm), (N/A)
[Mon Feb 1 17:32:41 2016 < 0.000003>] cfg80211: (5250000 KHz - 5330000 KHz @ 80000 KHz, 160000 KHz AUTO), (N/A, 2000 mBm), (0 s)
[Mon Feb 1 17:32:41 2016 < 0.000002>] cfg80211: (5490000 KHz - 5730000 KHz @ 160000 KHz), (N/A, 2000 mBm), (0 s)
[Mon Feb 1 17:32:41 2016 < 0.000002>] cfg80211: (5735000 KHz - 5835000 KHz @ 80000 KHz), (N/A, 2000 mBm), (N/A)
[Mon Feb 1 17:32:41 2016 < 0.000003>] cfg80211: (57240000 KHz - 63720000 KHz @ 2160000 KHz), (N/A, 0 mBm), (N/A)
[Mon Feb 1 17:32:46 2016 < 4.427237>] wl0: online cpus 1
[Mon Feb 1 17:32:46 2016 < 0.000409>] wlan0: Broadcom BCM4365 802.11 Hybrid Wireless Controller 6.30.223.248 (r487574)
[Mon Feb 1 17:32:47 2016 < 0.765193>] wl0: link up (wlan0)
[Mon Feb 1 17:32:47 2016 < 0.000198>] cfg80211: Calling CRDA for country: TW
[Mon Feb 1 17:32:47 2016 < 0.004048>] cfg80211: Regulatory domain changed to country: TW
[Mon Feb 1 17:32:47 2016 < 0.000005>] cfg80211: DFS Master region: JP
[Mon Feb 1 17:32:47 2016 < 0.000003>] cfg80211: (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp), (dfs_cac_time)
[Mon Feb 1 17:32:47 2016 < 0.000004>] cfg80211: (2402000 KHz - 2472000 KHz @ 40000 KHz), (N/A, 3000 mBm), (N/A)
[Mon Feb 1 17:32:47 2016 < 0.000003>] cfg80211: (5270000 KHz - 5330000 KHz @ 40000 KHz), (N/A, 1700 mBm), (0 s)
[Mon Feb 1 17:32:47 2016 < 0.000003>] cfg80211: (5490000 KHz - 5590000 KHz @ 80000 KHz), (N/A, 3000 mBm), (0 s)
[Mon Feb 1 17:32:47 2016 < 0.000002>] cfg80211: (5650000 KHz - 5710000 KHz @ 40000 KHz), (N/A, 3000 mBm), (0 s)
[Mon Feb 1 17:32:47 2016 < 0.000002>] cfg80211: (5735000 KHz - 5835000 KHz @ 80000 KHz), (N/A, 3000 mBm), (N/A)
出现在环形缓冲区中。 ( dmesg -dT)。我不知道我的电脑似乎认为它在台湾是否相关。 （这是在英国）
此时，出色的mtr( mtr --curses 8.8.8.8) 告诉我，平均 24 毫秒内，我将 100% 的数据包往返至 google 的 dns。
这种情况持续一段可变的时间，然后数据包丢失将变得非常接近 100%，并且往返时间将变得非常长（数百或数千毫秒）。网络管理器仍然认为我已连接，但实际上无法访问互联网。
此时，按上述重置，一切都会恢复正常。
编辑
哦，我在环形缓冲区中发现了这个：
[Mon Feb 1 18:14:55 2016 < 0.050609>] ------------[ cut here ]------------
[Mon Feb 1 18:14:55 2016 < 0.000037>] WARNING: CPU: 0 PID: 27429 at /build/linux-x1KGLI/linux-3.16.7-ckt11/net/wireless/sme.c:791 wl_notify_roaming_status+0xbb/0x140 [wl]()
[Mon Feb 1 18:14:55 2016 < 0.000004>] Modules linked in: wl(PO) btrfs xor raid6_pq hfsplus msdos xfs libcrc32c dm_crypt algif_skcipher af_alg dm_mod xt_multiport bnep binfmt_misc uinput ip6t_REJECT xt_hl nfsd ip6t_rt auth_rpcgss oid_registry nfs_acl nfs nf_conntrack_ipv6 lockd fscache nf_defrag_ipv6 sunrpc ipt_REJECT xt_LOG xt_limit xt_tcpudp xt_addrtype nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack ip6table_filter ip6_tables nf_conntrack_netbios_ns nf_conntrack_broadcast nf_nat_ftp nf_nat nf_conntrack_ftp nf_conntrack iptable_filter ip_tables x_tables nls_utf8 nls_cp437 vfat rtsx_usb_ms memstick fat ecb btusb uvcvideo iTCO_wdt videobuf2_vmalloc videobuf2_memops joydev bluetooth iTCO_vendor_support videobuf2_core v4l2_common dell_wmi videodev snd_hda_codec_hdmi sparse_keymap media 6lowpan_iphc x86_pkg_temp_thermal intel_powerclamp
[Mon Feb 1 18:14:55 2016 < 0.000082>] intel_rapl coretemp kvm_intel kvm crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul snd_hda_codec_realtek snd_hda_codec_generic dell_laptop dcdbas glue_helper snd_hda_intel i915 ablk_helper pcspkr psmouse snd_hda_controller evdev snd_hda_codec serio_raw efi_pstore cryptd cfg80211 rfkill snd_hwdep snd_pcm snd_timer snd soundcore drm_kms_helper button drm battery ac i2c_algo_bit i2c_i801 i2c_core video processor mei_me lpc_ich mei shpchp thermal_sys efivars wmi loop fuse parport_pc ppdev lp parport autofs4 ext4 crc16 mbcache jbd2 rtsx_usb_sdmmc mmc_core rtsx_usb mfd_core sg sd_mod sr_mod crc_t10dif cdrom crct10dif_generic ahci ehci_pci ehci_hcd libahci crct10dif_pclmul crct10dif_common xhci_hcd crc32c_intel libata scsi_mod r8169 mii usbcore usb_common [last unloaded: wl]
[Mon Feb 1 18:14:55 2016 < 0.000100>] CPU: 0 PID: 27429 Comm: wl_event_handle Tainted: P W O 3.16.0-4-amd64 #1 Debian 3.16.7-ckt11-1+deb8u6
[Mon Feb 1 18:14:55 2016 < 0.000003>] Hardware name: Dell Inc. Inspiron 3537/0MJNYC, BIOS A07 11/12/2013
[Mon Feb 1 18:14:55 2016 < 0.000003>] 0000000000000009 ffffffff8150b4e5 0000000000000000 ffffffff81067767
[Mon Feb 1 18:14:55 2016 < 0.000006>] ffff880002e4e680 ffff880036c4bd54 ffff880002e4ee9a ffff88014aca3000
[Mon Feb 1 18:14:55 2016 < 0.000005>] ffff880002e4ea78 ffffffffa12cde1b 0000000000000039 00000000000000d0
[Mon Feb 1 18:14:55 2016 < 0.000006>] Call Trace:
[Mon Feb 1 18:14:55 2016 < 0.000014>] [<ffffffff8150b4e5>] ? dump_stack+0x41/0x51
[Mon Feb 1 18:14:55 2016 < 0.000010>] [<ffffffff81067767>] ? warn_slowpath_common+0x77/0x90
[Mon Feb 1 18:14:55 2016 < 0.000021>] [<ffffffffa12cde1b>] ? wl_notify_roaming_status+0xbb/0x140 [wl]
[Mon Feb 1 18:14:55 2016 < 0.000020>] [<ffffffffa12cc0b2>] ? wl_event_handler+0x62/0x1e0 [wl]
[Mon Feb 1 18:14:55 2016 < 0.000021>] [<ffffffffa12cc050>] ? wl_free_wdev.isra.24+0x70/0x70 [wl]
[Mon Feb 1 18:14:55 2016 < 0.000009>] [<ffffffff81087f7d>] ? kthread+0xbd/0xe0
[Mon Feb 1 18:14:55 2016 < 0.000007>] [<ffffffff81087ec0>] ? kthread_create_on_node+0x180/0x180
[Mon Feb 1 18:14:55 2016 < 0.000007>] [<ffffffff81511618>] ? ret_from_fork+0x58/0x90
[Mon Feb 1 18:14:55 2016 < 0.000007>] [<ffffffff81087ec0>] ? kthread_create_on_node+0x180/0x180
[Mon Feb 1 18:14:55 2016 < 0.000003>] ---[ end trace ff64772df7283e10 ]---
看起来像是确凿无疑的证据，我该怎么办？
事实上还有另外 71 份/var/log/kern.log
cat /var/log/kern.log | grep WARNING | grep notify_roaming_status | wc
71 1110 13009
只是今天。
答案1
根据https://wiki.debian.org/wl您可以尝试禁用电源管理，例如和
iwconfig wlan0 power off
答案2
您需要构建一个新内核。 BrodcomBCM43142正在该内核版本下工作3.2.81。为了了解这个问题，我们可以参考错误报告发布者@斯蒂芬基特
1）删除bcmwl驱动程序
2）编译3.2.81 核心
3）重新安装Broadcom-sta-dkms