Tudo funcionou bem no Ubuntu 13.08 usando o driver proprietário do STA. Sob insistência das mensagens de aviso do Ubuntu, eu decidi atualizar para o Ubuntu 14.04 apenas para ver que o circuito sem fio não responde mais. Eu tentei todos os 4 módulos do kernel considerados compatíveis com o chipset BCM4312, mas nenhum deles funcionou.
No último recurso, decidi fazer o download do código-fonte mais recente fornecido pela Broadcom (correspondente ao chipset BCM 4312) para a arquitetura de 64 bits. Eu tive que mudar alguns detalhes no sistema de arquivos para fazer a compilação funcionar. A compilação não mostrou nenhum aviso sério, mas ao tentar inserir o driver compilado resultante no kernel com o comando "insmod", um erro fatal apareceu devido a um erro de "formato". Eu tentei usar "modprobe", nenhuma mensagem de erro foi emitida mas aparentemente falhou porque a função de rede ainda está indisponível e o comando ouput de lscpi não mostrou nenhum driver de kernel conectado ao controlador de rede sem fio Broadcom.
Saída do comando LSCPI (texto irrelevante truncado):
... 06:00.0 Network controller [0280]: Broadcom Corporation BCM4312
802.11b/g LP-PHY [14e4:4315] (rev 01) Subsystem: Dell Wireless 1395 WLAN Mini-Card [1028:000b] Flags: bus master, fast devsel, latency 0,
IRQ 11 Memory at f4000000 (64-bit, non-prefetchable) [size=16K]
Capabilities: [40] Power Management version 3 Capabilities: [58]
Vendor Specific Information: Len=78 Capabilities: [e8] MSI:
Enable- Count=1/1 Maskable- 64bit+ Capabilities: [d0] Express
Endpoint, MSI 00 Capabilities: [100] Advanced Error Reporting
Capabilities: [13c] Virtual Channel Capabilities: [160] Device
Serial Number 1b-bf-44-ff-ff-db-00-16 Capabilities: [16c] Power
Budgeting
07:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd.
RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [10ec:8168]
(rev 02) Subsystem: Dell Device [1028:0273] Flags: bus master, fast
devsel, latency 0, IRQ 44 I/O ports at 5000 [size=256] Memory at
f8610000 (64-bit, prefetchable) [size=4K] Memory at f8600000 (64-bit,
prefetchable) [size=64K] [virtual] Expansion ROM at f8620000
[disabled] [size=64K] Capabilities: [40] Power Management version 3
Capabilities: [50] MSI: Enable+ Count=1/2 Maskable- 64bit+
Capabilities: [70] Express Endpoint, MSI 01 Capabilities: [b0]
MSI-X: Enable- Count=2 Masked- Capabilities: [d0] Vital Product Data
Capabilities: [100] Advanced Error Reporting Capabilities: [140]
Virtual Channel Capabilities: [160] Device Serial Number
00-00-00-00-00-00-00-00 Kernel driver in use: r8169 .... "
A mensagem de erro que recebi com o comando "insmod wl.ko" é
"formato de módulo inválido"
wl.ko é o arquivo obtido da compilação do código-fonte do driver fornecido pela Broadcom.
Eu desinstalei o driver do kernel (mesmo que eu duvido que ele tenha sido instalado / usado pelo sistema) usando o comando
apt-get purge bcmwl-kernel-source
(o terminal exibiu mensagens dizendo que o firmware-bc43-installer foi recuperado ou baixado para ser instalado)
Eu então instalei o driver STA inserindo o comando
apt-get install linux-firmware-nonfree
Eu verifiquei o arquivo /etc/modprobe.d/blacklist.conf e descomentei a linha lista negra bcm43xx , a única relacionada ao dispositivo / driver sem fio.
Em seguida, reinicie.
Agora ainda não tenho melhorias:
# lspci -v |grep -13 Network
I/O ports at 18e0 [size=32]
Memory at f8500000 (32-bit, non-prefetchable) [size=2K]
Capabilities: [80] MSI: Enable+ Count=1/4 Maskable- 64bit-
Capabilities: [70] Power Management version 3
Capabilities: [a8] SATA HBA v1.0
Kernel driver in use: ahci
00:1f.3 SMBus: Intel Corporation 82801H (ICH8 Family) SMBus Controller (rev 03)
Subsystem: Dell Device 0273
Flags: medium devsel, IRQ 10
Memory at c0500000 (32-bit, non-prefetchable) [size=256]
I/O ports at 1c20 [size=32]
06:00.0 Network controller: Broadcom Corporation BCM4312 802.11b/g LP-PHY (rev 01)
Subsystem: Dell Wireless 1395 WLAN Mini-Card
Flags: bus master, fast devsel, latency 0, IRQ 11
Memory at f4000000 (64-bit, non-prefetchable) [size=16K]
Capabilities: [40] Power Management version 3
Capabilities: [58] Vendor Specific Information: Len=78 <?>
Capabilities: [e8] MSI: Enable- Count=1/1 Maskable- 64bit+
Capabilities: [d0] Express Endpoint, MSI 00
Capabilities: [100] Advanced Error Reporting
Capabilities: [13c] Virtual Channel
Capabilities: [160] Device Serial Number 1b-bf-44-ff-ff-db-00-16
Capabilities: [16c] Power Budgeting <?>
07:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 02)
#lshw
...
*-pci:2
description: PCI bridge
product: 82801H (ICH8 Family) PCI Express Port 4
vendor: Intel Corporation
physical id: 1c.3
bus info: pci@0000:00:1c.3
version: 03
width: 32 bits
clock: 33MHz
capabilities: pci pciexpress msi pm normal_decode bus_master cap_list
configuration: driver=pcieport
resources: irq:42 ioport:4000(size=4096) memory:f4000000-f7ffffff ioport:fc000000(size=33554432)
*-network UNCLAIMED
description: Network controller
product: BCM4312 802.11b/g LP-PHY
vendor: Broadcom Corporation
physical id: 0
bus info: pci@0000:06:00.0
version: 01
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list
configuration: latency=0
resources: memory:f4000000-f4003fff
...
# lsmod
Module Size Used by
zram 18439 2
dm_crypt 22924 1
coretemp 13355 0
dell_wmi 12681 0
sparse_keymap 13890 1 dell_wmi
dell_laptop 17369 0
dcdbas 14397 1 dell_laptop
uvcvideo 80847 0
videobuf2_vmalloc 13056 1 uvcvideo
videobuf2_memops 13202 1 videobuf2_vmalloc
videobuf2_core 40542 1 uvcvideo
videodev 129379 2 uvcvideo,videobuf2_core
microcode 22939 0
joydev 17377 0
serio_raw 13215 0
lpc_ich 17061 0
parport_pc 28152 0
ppdev 17073 0
lp 17759 0
parport 46345 3 lp,ppdev,parport_pc
mac_hid 13205 0
psmouse 95934 0
ahci 25731 2
libahci 31394 1 ahci
sdhci_pci 18619 0
firewire_ohci 40315 0
sdhci 32686 1 sdhci_pci
r8169 67706 0
firewire_core 64566 1 firewire_ohci
i915 605700 3
crc_itu_t 12707 1 firewire_core
i2c_algo_bit 13413 1 i915
drm_kms_helper 49394 1 i915
drm 286260 4 i915,drm_kms_helper
wmi 19070 1 dell_wmi
video 19390 1 i915