Eu fiz uma nova instalação do Ubuntu 14.04 LTS no disco rígido de um laptop Lenovo Y650 Ideapad. O adaptador sem fio é um Intel PRO / Wireless 5100 AGN [Shiloh].
Inicialmente, não consegui me conectar a nenhuma rede sem fio; no entanto, eu podia vê-los. Não há problemas ao conectar via Ethernet. Eu só consegui me conectar à rede sem fio digitando este comando no Terminal:
echo "options iwlwifi 11n_disable=1" | sudo tee /etc/modprobe.d/iwlwifi.conf
As velocidades são extremamente lentas e intermitentes. Quando consigo executar um teste de velocidade, o ping é bom (24 a 26 ms), mas as velocidades de download variam de 0,15 a 0,30 Mbps.
iwconfig
eth0 no wireless extensions.
lo no wireless extensions.
wlan0 IEEE 802.11abg ESSID:"PinkRabbit"
Mode:Managed Frequency:2.412 GHz Access Point: E8:40:F2:CD:18:0B
Bit Rate=2 Mb/s Tx-Power=15 dBm
Retry long limit:7 RTS thr:off Fragment thr:off
Power Management:off
Link Quality=70/70 Signal level=-26 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:3 Invalid misc:254 Missed beacon:0
ifconfig
eth0 Link encap:Ethernet HWaddr 00:23:5a:d2:70:91
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:17
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:171 errors:0 dropped:0 overruns:0 frame:0
TX packets:171 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:15613 (15.6 KB) TX bytes:15613 (15.6 KB)
wlan0 Link encap:Ethernet HWaddr 00:1e:65:3e:0c:48
inet addr:192.168.0.13 Bcast:192.168.0.255 Mask:255.255.255.0
inet6 addr: fe80::21e:65ff:fe3e:c48/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:42 errors:0 dropped:0 overruns:0 frame:0
TX packets:96 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:9032 (9.0 KB) TX bytes:16851 (16.8 KB)
ferramenta nm
NetworkManager Tool
State: connected (global)
- Device: eth0 -----------------------------------------------------------------
Type: Wired
Driver: tg3
State: unavailable
Default: no
HW Address: 00:23:5A:D2:70:91
Capabilities:
Carrier Detect: yes
Wired Properties
Carrier: off
- Device: wlan0 [PinkRabbit] --------------------------------------------------
Type: 802.11 WiFi
Driver: iwlwifi
State: connected
Default: yes
HW Address: 00:1E:65:3E:0C:48
Capabilities:
Speed: 1 Mb/s
Wireless Properties
WEP Encryption: yes
WPA Encryption: yes
WPA2 Encryption: yes
Wireless Access Points (* = current AP)
*PinkRabbit: Infra, E8:40:F2:CD:18:0B, Freq 2412 MHz, Rate 54 Mb/s, Strength 92 WPA WPA2
IPv4 Settings:
Address: 192.168.0.13
Prefix: 24 (255.255.255.0)
Gateway: 192.168.0.1
DNS: 64.71.255.204
DNS: 64.71.255.198
DNS: 8.8.8.8
DNS: 8.8.4.4