我刚刚将 Ubuntu 从 10.04 更新到 12.04。但更新后，我无法连接到我的家庭 wifi 路由器。我尝试将它与我的 Android 设备连接，效果很好。有时它可以连接到我家的 wifi，但却无法上网。
设备配置如下：
saquib@saquib-laptop:~$ ifconfig
eth0 Link encap:Ethernet HWaddr e8:11:32:20:de:7a
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:41 Base address:0xc000
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:3453 errors:0 dropped:0 overruns:0 frame:0
TX packets:3453 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:271550 (271.5 KB) TX bytes:271550 (271.5 KB)
wlan0 Link encap:Ethernet HWaddr 08:10:76:c5:2b:d2
inet6 addr: fe80::a10:76ff:fec5:2bd2/64 Scope:Link
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:37 errors:0 dropped:0 overruns:0 frame:0
TX packets:268 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:5276 (5.2 KB) TX bytes:32395 (32.3 KB)
saquib@saquib-laptop:~$ iwconfig
lo no wireless extensions.
wlan0 IEEE 802.11bgn ESSID:off/any
Mode:Managed Access Point: Not-Associated Tx-Power=20 dBm
Retry long limit:7 RTS thr=2347 B Fragment thr:off
Power Management:off
eth0 no wireless extensions.
saquib@saquib-laptop:~$ rfkill list
0: hci0: Bluetooth
Soft blocked: no
Hard blocked: no
1: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
saquib@saquib-laptop:~$ sudo lshw -C network
*-network
description: Ethernet interface
product: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
vendor: Realtek Semiconductor Co., Ltd.
physical id: 0
bus info: pci@0000:04:00.0
logical name: eth0
version: 06
serial: e8:11:32:20:de:7a
size: 10Mbit/s
capacity: 1Gbit/s
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress msix vpd bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=half firmware=rtl_nic/rtl8168e-2.fw latency=0 link=no multicast=yes port=MII speed=10Mbit/s
resources: irq:41 ioport:3000(size=256) memory:fc900000-fc900fff memory:fca04000-fca07fff
*-network
description: Wireless interface
physical id: 4
bus info: usb@2:1.2
logical name: wlan0
serial: 08:10:76:c5:2b:d2
capabilities: ethernet physical wireless
configuration: broadcast=yes driver=rtl8192cu driverversion=3.2.0-54-generic firmware=N/A link=no multicast=yes wireless=IEEE 802.11bgn
saquib@saquib-laptop:~$ lspci
00:00.0 Host bridge: Intel Corporation Core Processor DRAM Controller (rev 02)
00:02.0 VGA compatible controller: Intel Corporation Core Processor Integrated Graphics Controller (rev 02)
00:16.0 Communication controller: Intel Corporation 5 Series/3400 Series Chipset HECI Controller (rev 06)
00:1a.0 USB controller: Intel Corporation 5 Series/3400 Series Chipset USB2 Enhanced Host Controller (rev 05)
00:1b.0 Audio device: Intel Corporation 5 Series/3400 Series Chipset High Definition Audio (rev 05)
00:1c.0 PCI bridge: Intel Corporation 5 Series/3400 Series Chipset PCI Express Root Port 1 (rev 05)
00:1c.3 PCI bridge: Intel Corporation 5 Series/3400 Series Chipset PCI Express Root Port 4 (rev 05)
00:1d.0 USB controller: Intel Corporation 5 Series/3400 Series Chipset USB2 Enhanced Host Controller (rev 05)
00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev a5)
00:1f.0 ISA bridge: Intel Corporation Mobile 5 Series Chipset LPC Interface Controller (rev 05)
00:1f.2 SATA controller: Intel Corporation 5 Series/3400 Series Chipset 4 port SATA AHCI Controller (rev 05)
00:1f.3 SMBus: Intel Corporation 5 Series/3400 Series Chipset SMBus Controller (rev 05)
00:1f.6 Signal processing controller: Intel Corporation 5 Series/3400 Series Chipset Thermal Subsystem (rev 05)
04:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 06)
3f:00.0 Host bridge: Intel Corporation Core Processor QuickPath Architecture Generic Non-core Registers (rev 02)
3f:00.1 Host bridge: Intel Corporation Core Processor QuickPath Architecture System Address Decoder (rev 02)
3f:02.0 Host bridge: Intel Corporation Core Processor QPI Link 0 (rev 02)
3f:02.1 Host bridge: Intel Corporation Core Processor QPI Physical 0 (rev 02)
3f:02.2 Host bridge: Intel Corporation Core Processor Reserved (rev 02)
3f:02.3 Host bridge: Intel Corporation Core Processor Reserved (rev 02)
saquib@saquib-laptop:~$ nm-tool
NetworkManager Tool
State: disconnected
- Device: wlan0 ----------------------------------------------------------------
Type: 802.11 WiFi
Driver: rtl8192cu
State: disconnected
Default: no
HW Address: 08:10:76:C5:2B:D2
Capabilities:
Wireless Properties
WEP Encryption: yes
WPA Encryption: yes
WPA2 Encryption: yes
Wireless Access Points
TP-LINK_E86B12: Infra, A0:F3:C1:E8:6B:12, Freq 2417 MHz, Rate 54 Mb/s, Strength 99 WPA WPA2
- Device: eth0 -----------------------------------------------------------------
Type: Wired
Driver: r8169
State: unavailable
Default: no
HW Address: E8:11:32:20:DE:7A
Capabilities:
Carrier Detect: yes
Wired Properties
Carrier: off
答案1
首先，确保您具备必要的先决条件：
sudo apt-get install linux-headers-generic build-essential dkms git
使用以下命令克隆更新的驱动程序git：
git clone https://github.com/pvaret/rtl8192cu-fixes.git
将其设置为 DKMS 模块：
sudo dkms add ./rtl8192cu-fixes
构建并安装驱动程序：
sudo dkms install 8192cu/1.8
刷新模块列表：
sudo depmod -a
确保本机（和损坏的）内核驱动程序被列入黑名单：
sudo cp ./rtl8192cu-fixes/blacklist-native-rtl8192.conf /etc/modprobe.d/
我们不要冒险。指示 Ubuntu 在启动时加载新的驱动程序。
echo 8192cu | sudo tee -a /etc/modules
重启。
你完成了。
谢谢P·瓦雷特为了这个出色的修复。