Estou tendo problemas para consertar uma rede sem fio inutilmente lenta em um novo PC com o Ubuntu 14.04 LTS instalado. Depois de um tempo eu não tenho conexão de rede. Funciona se eu reiniciar meu computador (ainda lento), mas a conexão geralmente fica mais lenta e depois não consigo usá-la.
A placa sem fio que estou usando é um D-Link DWA-548 pci-express.
Eu deparei com alguns problemas semelhantes na minha pesquisa do Google, nenhuma das sugestões me ajudou.
Aqui estão alguns comandos úteis para imprimir informações que podem ajudar. Eu vi alguns gurus pedindo esta informação (peguei em um dos posts do varunendra):
Código:
====================================================================================
lsb_release -d
--------------
Description: Ubuntu 14.04.2 LTS
====================================================================================
uname -mr
---------
3.13.0-55-generic x86_64
====================================================================================
lspci -nnk | grep -iA2 net
--------------------------
02:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [10ec:8168] (rev 0c)
Subsystem: Gigabyte Technology Co., Ltd Motherboard [1458:e000]
Kernel driver in use: r8169
03:00.0 Network controller [0280]: Ralink corp. RT5392 PCIe Wireless Network Adapter [1814:5392]
Subsystem: D-Link System Inc Device [1186:3c06]
Kernel driver in use: rt2800pci
====================================================================================
lsmod
-----
Module Size Used by
...
rt2800pci 13598 0
rt2800mmio 20986 1 rt2800pci
rt2800lib 88867 2 rt2800pci,rt2800mmio
rt2x00pci 13287 1 rt2800pci
rt2x00mmio 13603 2 rt2800pci,rt2800mmio
rt2x00lib 55250 5 rt2x00pci,rt2800lib,rt2800pci,rt2800mmio,rt2x00mmio
mac80211 639514 3 rt2x00lib,rt2x00pci,rt2800lib
cfg80211 541326 2 mac80211,rt2x00lib
r8169 67581 0
...
====================================================================================
iwconfig
--------
eth0 no wireless extensions.
lo no wireless extensions.
wlan0 IEEE 802.11bgn ESSID:"xx xxx"
Mode:Managed Frequency:2.412 GHz Access Point: <masked_address>
Bit Rate=27 Mb/s Tx-Power=20 dBm
Retry short limit:7 RTS thr:off Fragment thr:off
Power Management:off
Link Quality=47/70 Signal level=-63 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:37 Invalid misc:125 Missed beacon:0
====================================================================================
rfkill list all
---------------
0: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
====================================================================================
iw reg get
----------
country 00:
(2402 - 2472 @ 40), (3, 20)
(2457 - 2482 @ 40), (3, 20), PASSIVE-SCAN, NO-IBSS
(2474 - 2494 @ 20), (3, 20), NO-OFDM, PASSIVE-SCAN, NO-IBSS
(5170 - 5250 @ 40), (3, 20), PASSIVE-SCAN, NO-IBSS
(5735 - 5835 @ 40), (3, 20), PASSIVE-SCAN, NO-IBSS
====================================================================================
nm-tool
-------
NetworkManager Tool
State: connected (global)
- Device: wlan0 [Ex Mente]
Type: 802.11 WiFi
Driver: rt2800pci
State: connected
Default: yes
HW Address: <masked_address>
Capabilities:
Speed: 14 Mb/s
Wireless Properties
WEP Encryption: yes
WPA Encryption: yes
WPA2 Encryption: yes
Wireless Access Points (* = current AP)
*Ex Mente: Infra, <masked_address>, Freq 2412 MHz, Rate 54 Mb/s, Strength 57 WPA2
IPv4 Settings:
.
.
.
- Device: eth0
Type: Wired
Driver: r8169
State: unavailable
Default: no
HW Address: <masked_address>
Capabilities:
Carrier Detect: yes
Wired Properties
Carrier: off
====================================================================================
sudo iwlist scan
----------------
eth0 Interface doesn't support scanning.
lo Interface doesn't support scanning.
wlan0 Scan completed :
Cell 01 - Address: <masked_address>
Channel:1
Frequency:2.412 GHz (Channel 1)
Quality=53/70 Signal level=-57 dBm
Encryption key:on
ESSID:"Ex Mente"
Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 18 Mb/s
24 Mb/s; 36 Mb/s; 54 Mb/s
Bit Rates:6 Mb/s; 9 Mb/s; 12 Mb/s; 48 Mb/s
Mode:Master
Extra:tsf=0000000000000000
Extra: Last beacon: 56ms ago
IE: Unknown: 00084578204D656E7465
IE: Unknown: 010882848B962430486C
IE: Unknown: 030101
IE: Unknown: 2A0104
IE: Unknown: 2F0104
IE: IEEE 802.11i/WPA2 Version 1
Group Cipher : CCMP
Pairwise Ciphers (1) : CCMP
Authentication Suites (1) : PSK
IE: Unknown: 32040C121860
IE: Unknown: 2D1AFE181BFFFF000001000000000000000000000000000000000000
IE: Unknown: 3D1601051700000000000000000000000000000000000000
IE: Unknown: DD7D0050F204104A00011010440001021041000100103B00010310470010550364D39CAC0C7C62E4DD6D11DFF2AD102100074E6574676561721023000944474E3232303076331024000944474E32323030763310420004313233341054000800060050F20400011011000944474E323230307633100800020084103C000101
IE: Unknown: DD090010180205F02C0000
IE: Unknown: DD180050F2020101800003A4000027A4000042435E0062322F00
====================================================================================
egrep '^(#.*device|[^#]|$)' /etc/udev/rules.d/70-persistent-net.rules
---------------------------------------------------------------------
# PCI device 0x10ec:0x8168 (r8169)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="<masked_address>", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0"
# PCI device 0x1814:0x5392 (rt2800pci)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="<masked_address>", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="wlan*", NAME="wlan0"
====================================================================================
dmesg | grep 'wlan|rt2'
-----------------------
Eu tentei configurar o nohwcrypt também, mas não tive sucesso:
Código:
sudo modprobe -rv rt2800pci
sudo modprobe -v rt2800pci nohwcrypt=Y
Deixa meu wireless incapaz de se conectar.