我今天启动了我的戴尔 Studio 笔记本电脑，但没有无线网络连接。
ifconfig -a返回：
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet 6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets: 3184 errors:0 dropped:0 overruns:0 frame:0
TX packets: 3184 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:267904 (267.9 KB) TX bytes:267904 (267.9kb)
lspci -knn 的输出：
00:00.0 Host bridge [0600]: Intel Corporation Mobile 4 Series Chipset Memory Controller Hub [8086:2a40] (rev 07)
Subsystem: Dell Device [1028:02ea]
Kernel driver in use: agpgart-intel
00:02.0 VGA compatible controller [0300]: Intel Corporation Mobile 4 Series ChipSet Integrated Graphics Controller [8086:2a42] (rev 07)
Subsystem: Dell Device [1028:02ea] (rev 07)
00:1a.0 USB controller [0c03]: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #4 [8086:2937] (rev 03)
Subsystem: Dell Device [1028:02ea]
Kernel Driver in use: uhci_hcd
00:1a.1 USB controller [0c03]: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #5 [8086:2937] (rev 03)
Subsystem: Dell Device [1028:02ea]
Kernel Driver in use: uhci_hcd
00:1a.2 USB controller [0c03]: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #6 [8086:2937] (rev 03)
Subsystem: Dell Device [1028:02ea]
Kernel Driver in use: uhci_hcd
00:1a.7 USB controller [0c03]: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #2 [8086:2937] (rev 03)
Subsystem: Dell Device [1028:02ea]
Kernel Driver in use: ehci_pci
00:1b.0 Audio device [0403}: Intel Corporation 82801I (ICH9 Family) HD AUdio Controller [8086:293e] (rev 03)
00:1c.0 PCI bridge [0604]: Intel Corporation 82801I (ICH9 Family) PCI Express Port 1 [8086:2940] (rev 03)
Kernel driver in use: pcieport
00:1c.1 PCI bridge [0604]: Intel Corporation 82801I (ICH9 Family) PCI Express Port 2 [8086:2942] (rev 03)
Kernel driver in use: pcieport
00:1c.2 PCI bridge [0604]: Intel Corporation 82801I (ICH9 Family) PCI Express Port 3 [8086:2944] (rev 03)
Kernel driver in use: pcieport
00:1c.3 PCI bridge [0604]: Intel Corporation 82801I (ICH9 Family) PCI Express Port 4 [8086:2946] (rev 03)
Kernel driver in use: pcieport
00:1c.4 PCI bridge [0604]: Intel Corporation 82801I (ICH9 Family) PCI Express Port 5 [8086:2948] (rev 03)
Kernel driver in use: pcieport
00:1c.5 PCI bridge [0604]: Intel Corporation 82801I (ICH9 Family) PCI Express Port 6 [8086:294a] (rev 03)
Kernel driver in use: pcieport
00:1d.0 USB controller [0c03]: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #1 [8086:2934] (rev 03)
Subsystem: Dell Dvice [1028:02ea]
Kernel driver in use: uhci_hd
00:1d.1 USB controller [0c03]: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #2 [8086:2935] (rev 03)
Subsystem: Dell Dvice [1028:02ea]
Kernel driver in use: uhci_hd
00:1d.2 USB controller [0c03]: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #3 [8086:2936] (rev 03)
Subsystem: Dell Dvice [1028:02ea]
Kernel driver in use: uhci_hd
00:1d.7 USB controller [0c03]: Intel Corporation 82801I (ICH9 Family) USB2 EHCI Controller #1 [8086:293a] (rev 03)
Subsystem: Dell Dvice [1028:02ea]
Kernel driver in use: ehci_pci
00:1e.0 PCI bridge [0604]: Intel Corporation 82801 Mobil PCI Bridge [8086:2448] (rev 93)
00:1f.o ISA bridge [0601]: Intel Corporation ICH9m-E Interface Controller [8086:2917] (rev 03)
Subsystem: Dell Device [1028:02ea]
00:1f.2 SATA Controller [0106]: Intel Corporation 82801IBM/IEM (ICH9m/ICH9m-E) 4 Port SATA Controller [AHCI mode] [8086:2929] (rev 03)
Subsystem Dell Device [1028:02ea]
Kernel driver in use: ahci
00:1f.3 SMBus [0c05]: Intel Corporation 82801I (ICH9 Family) SMBus Controller [8086:2930] (rev 03)
Subsystem Dell Device [1028:02ea]
08:00.0 Network controller [0280]: Intel Corporation WiFi Link 5100 [8086:4232]
Subsystem: Intel Corporation Wifi Link 5100 AGN [8086:1321]
14:00.0 FireWire (IEEE 1394) [0c00]: O2 Micro, Inc. 1394 OHCI Compliant Host Controller [1217:10f7] (rev 01)
Subsystem: Dell Device [1028:02ea]
14:00.1 SD Host Controller [0805]:O2 Micro, Inc. Integrated MMC/SD Controller [1217:8120] (rev 01)
Subsystem: Dell Device [1028:02ea]
14:00.2 Mass Storage controller [0180]: O2 Micro, Inc. Integrated MS/MSPRO/xD Controller [1217:8130] (rev 01)
Subsystem: Dell Device [1028:02ea]
20:00.0 Ethernet Controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [10ec:8168] (rev 03)
Subsystem: Dell Dvice [1028:02ea]