无线连接不佳 Ubuntu 14.04 LTS Ralink
Poor Wireless Connection Ubuntu 14.04 LTS Ralink
通过无线连接时，我的互联网连接非常不稳定和缓慢（有时下降到 5-10 bytes/sec）并且连接经常掉线。我正在使用 WICD 并通过外部 USB 无线网卡 (WLAN2) 进行连接。此问题与 Ubuntu 隔离，因为在相同位置连接到相同 AP 的相同装备在引导至 Yosemite 时运行良好。我怀疑这是一个驱动程序问题，但尝试了其他帖子建议的许多修复程序并且 none 有所不同。以下是 ifconfig、iwconfig 和 lshw 的输出：
benjamintrapani@benjamintrapani-To-be-filled-by-O-E-M:~$ ifconfig
eth0 Link encap:Ethernet HWaddr 94:de:80:b1:19:00
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)
ham0 Link encap:Ethernet HWaddr 7a:79:19:10:6a:23
inet addr:25.16.106.35 Bcast:25.255.255.255 Mask:255.0.0.0
inet6 addr: fe80::7879:19ff:fe10:6a23/64 Scope:Link
inet6 addr: 2620:9b::1910:6a23/96 Scope:Global
UP BROADCAST RUNNING MULTICAST MTU:1404 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:64 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:500
RX bytes:0 (0.0 B) TX bytes:13700 (13.7 KB)
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:65536 Metric:1
RX packets:1152 errors:0 dropped:0 overruns:0 frame:0
TX packets:1152 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:132871 (132.8 KB) TX bytes:132871 (132.8 KB)
wlan2 Link encap:Ethernet HWaddr 7c:dd:90:82:2e:72
inet addr:10.0.0.10 Bcast:10.0.0.255 Mask:255.255.255.0
inet6 addr: fe80::7edd:90ff:fe82:2e72/64 Scope:Link
inet6 addr: 2601:6:7580:e5e:94f5:8bb3:4446:bf19/64 Scope:Global
inet6 addr: 2601:6:7580:e5e:7edd:90ff:fe82:2e72/64 Scope:Global
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:25806 errors:0 dropped:0 overruns:0 frame:0
TX packets:24509 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:25435219 (25.4 MB) TX bytes:14042934 (14.0 MB)
benjamintrapani@benjamintrapani-To-be-filled-by-O-E-M:~$ iwconfig
eth0 no wireless extensions.
wlan0 IEEE 802.11bgn ESSID:off/any
Mode:Managed Access Point: Not-Associated Tx-Power=0 dBm
Retry short limit:7 RTS thr:off Fragment thr:off
Power Management:off
wlan2 IEEE 802.11bgn ESSID:"HOME-86D2"
Mode:Managed Frequency:2.412 GHz Access Point: 90:1A:CA:AC:86:D0
Bit Rate=78 Mb/s Tx-Power=20 dBm
Retry short limit:7 RTS thr:off Fragment thr:off
Power Management:off
Link Quality=65/70 Signal level=-45 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:1063 Invalid misc:34 Missed beacon:0
ham0 no wireless extensions.
lo no wireless extensions.
benjamintrapani@benjamintrapani-由-O-E-M 填充：~$ sudo lshw -C 网络
*-network DISABLED
description: Wireless interface
product: RT5392 PCIe Wireless Network Adapter
vendor: Ralink corp.
physical id: 0
bus info: pci@0000:02:00.0
logical name: wlan0
version: 00
serial: 00:e0:5c:00:04:93
width: 32 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
configuration: broadcast=yes driver=rt2800pci driverversion=3.16.0-37-generic firmware=N/A latency=0 link=no multicast=yes wireless=IEEE 802.11bgn
resources: irq:16 memory:f7d00000-f7d0ffff
*-network
description: Ethernet interface
product: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
vendor: Realtek Semiconductor Co., Ltd.
physical id: 0
bus info: pci@0000:03:00.0
logical name: eth0
version: 06
serial: 94:de:80:b1:19:00
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=rtl8168e-3_0.0.4 03/27/12 latency=0 link=no multicast=yes port=MII speed=10Mbit/s
resources: irq:42 ioport:d000(size=256) memory:f0004000-f0004fff memory:f0000000-f0003fff
*-network:0
description: Wireless interface
physical id: 2
bus info: usb@1:1.1
logical name: wlan2
serial: 7c:dd:90:82:2e:72
capabilities: ethernet physical wireless
configuration: broadcast=yes driver=rt2800usb driverversion=3.16.0-37-generic firmware=0.29 ip=10.0.0.10 link=yes multicast=yes wireless=IEEE 802.11bgn
*-network:1
description: Ethernet interface
physical id: 3
logical name: ham0
serial: 7a:79:19:10:6a:23
size: 10Mbit/s
capabilities: ethernet physical
configuration: autonegotiation=off broadcast=yes driver=tun driverversion=1.6 duplex=full ip=25.16.106.35 link=yes multicast=yes port=twisted pair speed=10Mbit/s
感谢所有做出贡献的人，原来是驱动程序问题，将驱动程序更新到最新的专有版本解决了问题。
通过无线连接时，我的互联网连接非常不稳定和缓慢（有时下降到 5-10 bytes/sec）并且连接经常掉线。我正在使用 WICD 并通过外部 USB 无线网卡 (WLAN2) 进行连接。此问题与 Ubuntu 隔离，因为在相同位置连接到相同 AP 的相同装备在引导至 Yosemite 时运行良好。我怀疑这是一个驱动程序问题，但尝试了其他帖子建议的许多修复程序并且 none 有所不同。以下是 ifconfig、iwconfig 和 lshw 的输出：
benjamintrapani@benjamintrapani-To-be-filled-by-O-E-M:~$ ifconfig
eth0 Link encap:Ethernet HWaddr 94:de:80:b1:19:00
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)
ham0 Link encap:Ethernet HWaddr 7a:79:19:10:6a:23
inet addr:25.16.106.35 Bcast:25.255.255.255 Mask:255.0.0.0
inet6 addr: fe80::7879:19ff:fe10:6a23/64 Scope:Link
inet6 addr: 2620:9b::1910:6a23/96 Scope:Global
UP BROADCAST RUNNING MULTICAST MTU:1404 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:64 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:500
RX bytes:0 (0.0 B) TX bytes:13700 (13.7 KB)
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:65536 Metric:1
RX packets:1152 errors:0 dropped:0 overruns:0 frame:0
TX packets:1152 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:132871 (132.8 KB) TX bytes:132871 (132.8 KB)
wlan2 Link encap:Ethernet HWaddr 7c:dd:90:82:2e:72
inet addr:10.0.0.10 Bcast:10.0.0.255 Mask:255.255.255.0
inet6 addr: fe80::7edd:90ff:fe82:2e72/64 Scope:Link
inet6 addr: 2601:6:7580:e5e:94f5:8bb3:4446:bf19/64 Scope:Global
inet6 addr: 2601:6:7580:e5e:7edd:90ff:fe82:2e72/64 Scope:Global
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:25806 errors:0 dropped:0 overruns:0 frame:0
TX packets:24509 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:25435219 (25.4 MB) TX bytes:14042934 (14.0 MB)
benjamintrapani@benjamintrapani-To-be-filled-by-O-E-M:~$ iwconfig
eth0 no wireless extensions.
wlan0 IEEE 802.11bgn ESSID:off/any
Mode:Managed Access Point: Not-Associated Tx-Power=0 dBm
Retry short limit:7 RTS thr:off Fragment thr:off
Power Management:off
wlan2 IEEE 802.11bgn ESSID:"HOME-86D2"
Mode:Managed Frequency:2.412 GHz Access Point: 90:1A:CA:AC:86:D0
Bit Rate=78 Mb/s Tx-Power=20 dBm
Retry short limit:7 RTS thr:off Fragment thr:off
Power Management:off
Link Quality=65/70 Signal level=-45 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:1063 Invalid misc:34 Missed beacon:0
ham0 no wireless extensions.
lo no wireless extensions.
benjamintrapani@benjamintrapani-由-O-E-M 填充：~$ sudo lshw -C 网络
*-network DISABLED
description: Wireless interface
product: RT5392 PCIe Wireless Network Adapter
vendor: Ralink corp.
physical id: 0
bus info: pci@0000:02:00.0
logical name: wlan0
version: 00
serial: 00:e0:5c:00:04:93
width: 32 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
configuration: broadcast=yes driver=rt2800pci driverversion=3.16.0-37-generic firmware=N/A latency=0 link=no multicast=yes wireless=IEEE 802.11bgn
resources: irq:16 memory:f7d00000-f7d0ffff
*-network
description: Ethernet interface
product: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
vendor: Realtek Semiconductor Co., Ltd.
physical id: 0
bus info: pci@0000:03:00.0
logical name: eth0
version: 06
serial: 94:de:80:b1:19:00
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=rtl8168e-3_0.0.4 03/27/12 latency=0 link=no multicast=yes port=MII speed=10Mbit/s
resources: irq:42 ioport:d000(size=256) memory:f0004000-f0004fff memory:f0000000-f0003fff
*-network:0
description: Wireless interface
physical id: 2
bus info: usb@1:1.1
logical name: wlan2
serial: 7c:dd:90:82:2e:72
capabilities: ethernet physical wireless
configuration: broadcast=yes driver=rt2800usb driverversion=3.16.0-37-generic firmware=0.29 ip=10.0.0.10 link=yes multicast=yes wireless=IEEE 802.11bgn
*-network:1
description: Ethernet interface
physical id: 3
logical name: ham0
serial: 7a:79:19:10:6a:23
size: 10Mbit/s
capabilities: ethernet physical
configuration: autonegotiation=off broadcast=yes driver=tun driverversion=1.6 duplex=full ip=25.16.106.35 link=yes multicast=yes port=twisted pair speed=10Mbit/s
感谢所有做出贡献的人，原来是驱动程序问题，将驱动程序更新到最新的专有版本解决了问题。