Blu*_*ber 6 linux wireless-networking broadcom ubuntu
我刚刚在 2012 年年中的 MacBook Air 上安装了 Ubuntu。一切都开箱即用，但 wifi 显示出一些奇怪的行为。
当我第一次登录时，它真的很快，加载 google.com 几乎是即时的，总体上浏览感觉至少和在 Mac OS 上一样流畅。但是，几分钟后连接速度显着变慢，有时加载 google.com 需要 5 秒以上，简单的重新启动可以解决几分钟的问题。
眼镜：
我尝试了很多东西，但没有一个真正有帮助
似乎没有任何帮助，放缓总是发生。我确实注意到延迟（ping google.com）保持大致相同（大约 9 毫秒）。
下面是一些可能有用的更多信息。
$ lspci -nnk | grep -iA2 net
02:00.0 Network controller [0280]: Broadcom Corporation BCM43224 802.11a/b/g/n [14e4:4353] (rev 01)
Subsystem: Apple Inc. Device [106b:00e9]
Kernel driver in use: bcma-pci-bridge
$ rfkill list
0: hci0: Bluetooth
Soft blocked: no
Hard blocked: no
1: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
$ lsmod
Module Size Used by
dm_crypt 22820 1
arc4 12615 2
brcmsmac 550698 0
coretemp 13355 0
kvm_intel 132891 0
parport_pc 28152 0
kvm 443165 1 kvm_intel
ppdev 17073 0
cordic 12574 1 brcmsmac
brcmutil 14755 1 brcmsmac
mac80211 606457 1 brcmsmac
cfg80211 510937 2 brcmsmac,mac80211
bnep 18036 2
rfcomm 42641 12
joydev 17377 0
applesmc 19353 0
input_polldev 13896 1 applesmc
snd_hda_codec_hdmi 36913 1
microcode 22881 0
snd_hda_codec_cirrus 23829 1
nls_iso8859_1 12713 1
uvcvideo 80847 0
btusb 22474 0
snd_hda_intel 39619 3
videobuf2_vmalloc 13056 1 uvcvideo
snd_hda_codec 136453 3 snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec_cirrus
bcm5974 17347 0
bluetooth 228619 22 bnep,btusb,rfcomm
snd_hwdep 13602 1 snd_hda_codec
lpc_ich 17061 0
videobuf2_memops 13202 1 videobuf2_vmalloc
videobuf2_core 40513 1 uvcvideo
videodev 129260 2 uvcvideo,videobuf2_core
bcma 41051 1 brcmsmac
snd_pcm 97451 3 snd_hda_codec_hdmi,snd_hda_codec,snd_hda_intel
snd_page_alloc 18710 2 snd_pcm,snd_hda_intel
snd_seq_midi 13324 0
snd_seq_midi_event 14899 1 snd_seq_midi
snd_rawmidi 30180 1 snd_seq_midi
snd_seq 61554 2 snd_seq_midi_event,snd_seq_midi
snd_seq_device 14497 3 snd_seq,snd_rawmidi,snd_seq_midi
snd_timer 29425 2 snd_pcm,snd_seq
snd 68876 16 snd_hwdep,snd_timer,snd_hda_codec_hdmi,snd_pcm,snd_seq,snd_rawmidi,snd_hda_codec,snd_hda_intel,snd_seq_device,snd_hda_codec_cirrus
mei 41158 0
soundcore 12680 1 snd
apple_bl 13673 0
mac_hid 13205 0
lp 17759 0
parport 46345 3 lp,ppdev,parport_pc
usb_storage 57204 0
hid_apple 13237 0
hid_generic 12540 0
ghash_clmulni_intel 13259 0
aesni_intel 55399 399
aes_x86_64 17255 1 aesni_intel
xts 12885 1 aesni_intel
lrw 13257 1 aesni_intel
gf128mul 14951 2 lrw,xts
ablk_helper 13597 1 aesni_intel
cryptd 20373 4 ghash_clmulni_intel,aesni_intel,ablk_helper
i915 600351 3
ahci 25731 3
libahci 31364 1 ahci
video 19390 1 i915
i2c_algo_bit 13413 1 i915
drm_kms_helper 49394 1 i915
usbhid 47074 0
drm 286313 4 i915,drm_kms_helper
hid 101002 3 hid_generic,usbhid,hid_apple
$ dmesg | egrep 'b43|bcma|brcm|[F]irm'
[ 0.055025] [Firmware Bug]: ioapic 2 has no mapping iommu, interrupt remapping will be disabled
[ 0.152336] [Firmware Bug]: ACPI: BIOS _OSI(Linux) query ignored
[ 2.187681] pci_root PNP0A08:00: [Firmware Info]: MMCONFIG for domain 0000 [bus 00-99] only partially covers this bridge
[ 12.553600] bcma-pci-bridge 0000:02:00.0: enabling device (0000 -> 0002)
[ 12.553657] bcma: bus0: Found chip with id 0xA8D8, rev 0x01 and package 0x08
[ 12.553688] bcma: bus0: Core 0 found: ChipCommon (manuf 0x4BF, id 0x800, rev 0x22, class 0x0)
[ 12.553715] bcma: bus0: Core 1 found: IEEE 802.11 (manuf 0x4BF, id 0x812, rev 0x17, class 0x0)
[ 12.553764] bcma: bus0: Core 2 found: PCIe (manuf 0x4BF, id 0x820, rev 0x0F, class 0x0)
[ 12.605777] bcma: bus0: Bus registered
[ 12.852925] brcmsmac bcma0:0: mfg 4bf core 812 rev 23 class 0 irq 17
[ 13.085176] brcmsmac bcma0:0: brcms_ops_bss_info_changed: qos enabled: false (implement)
[ 13.085186] brcmsmac bcma0:0: brcms_ops_config: change power-save mode: false (implement)
[ 20.862617] brcmsmac bcma0:0: brcmsmac: brcms_ops_bss_info_changed: associated
[ 20.862622] brcmsmac bcma0:0: brcms_ops_bss_info_changed: arp filtering: enabled true, count 0 (implement)
[ 20.862625] brcmsmac bcma0:0: brcms_ops_bss_info_changed: qos enabled: true (implement)
[ 20.897957] brcmsmac bcma0:0: brcms_ops_bss_info_changed: arp filtering: enabled true, count 1 (implement)
$ iwconfig
lo no wireless extensions.
wlan0 IEEE 802.11abgn ESSID:"wlan"
Mode:Managed Frequency:5.22 GHz Access Point: E0:46:9A:4E:63:9A
Bit Rate=65 Mb/s Tx-Power=17 dBm
Retry long limit:7 RTS thr:off Fragment thr:off
Power Management:off
Link Quality=63/70 Signal level=-47 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:13 Invalid misc:56 Missed beacon:0
小智 1
我的 Dell Vostro 中曾经有相同的无线卡，我也遇到过一些类似的问题。
尝试按照此处所述编译驱动程序（我不使用 Ubuntu，也不再使用笔记本来测试并确保其工作）
https://askubuntu.com/questions/55868/how-to-install-a-broadcom-wireless-driver
这些也可以帮助：
https://help.ubuntu.com/community/WifiDocs/Driver/bcm43xx http://ubuntuforums.org/showthread.php?t=1658627
最后，我有一种强烈的感觉，你确实需要重新编译内核并激活CONFIG_B43_BCMA_EXTRAvar 才能加载b43模块。
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