Eu tenho conexões wifi lentas e crônicas em várias redes por um tempo agora, acho que desde a minha atualização para 12.04 quando foi lançada. Eu tentei muitas das dicas e truques já disponíveis nos fóruns sem sorte (wicd, etc.). Eu quero ver se algum de vocês especialistas pode me ajudar, e obrigado antecipadamente!
Eu uso o Ubuntu 12.04 em um lenovo ideapad y650, e a maioria das redes que eu conecto para perder a conexão com freqüência ou não fornecem largura de banda apropriada quando estou conectado.
Aqui estão alguns resultados das verificações habituais do sistema:
cat / etc / lsb-release; uname -a:
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=12.04
DISTRIB_CODENAME=precise
DISTRIB_DESCRIPTION="Ubuntu 12.04.2 LTS"
Linux mgeorge-lenovo 3.2.0-48-generic-pae #74-Ubuntu SMP Thu Jun 6 20:05:01 UTC 2013 i686 i686 i386 GNU/Linux
lspci -nnk | grep -iA2 net:
04:00.0 Network controller [0280]: Intel Corporation PRO/Wireless 5100 AGN [Shiloh]
Network Connection [8086:4237]
Subsystem: Intel Corporation WiFi Link 5100 AGN [8086:1211]
Kernel driver in use: iwlwifi
--
08:00.0 Ethernet controller [0200]: Broadcom Corporation NetLink BCM5784M Gigabit Ethernet PCIe [14e4:1698] (rev 10)
Subsystem: Lenovo Device [17aa:3878]
Kernel driver in use: tg3
lsusb:
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 008 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 002: ID 090c:7371 Silicon Motion, Inc. - Taiwan (formerly Feiya Technology Corp.)
iwconfig:
lo no wireless extensions.
wlan0 IEEE 802.11abgn ESSID:"Dyno"
Mode:Managed Frequency:2.412 GHz Access Point: CC:5D:4E:46:0A:93
Bit Rate=150 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=-40 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:948 Invalid misc:728 Missed beacon:0
eth0 no wireless extensions.
rfkill listar todos:
0: ideapad_wlan: Wireless LAN
Soft blocked: no
Hard blocked: no
1: ideapad_bluetooth: Bluetooth
Soft blocked: yes
Hard blocked: no
2: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
lsmod:
Module Size Used by
uvcvideo 67203 0
videodev 86588 1 uvcvideo
nouveau 712674 3
ttm 65344 1 nouveau
drm_kms_helper 45466 1 nouveau
drm 197641 5 nouveau,ttm,drm_kms_helper
i2c_algo_bit 13199 1 nouveau
mxm_wmi 12893 1 nouveau
wmi 18744 1 mxm_wmi
joydev 17393 0
arc4 12473 2
snd_hda_codec_realtek 174313 1
snd_hda_codec_hdmi 31775 1
snd_hda_intel 32719 3
snd_hda_codec 109562 3 snd_hda_codec_realtek,snd_hda_codec_hdmi,snd_hda_intel
snd_hwdep 13276 1 snd_hda_codec
snd_pcm 80916 3 snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec
snd_seq_midi 13132 0
snd_rawmidi 25424 1 snd_seq_midi
snd_seq_midi_event 14475 1 snd_seq_midi
psmouse 86520 0
snd_seq 51592 2 snd_seq_midi,snd_seq_midi_event
serio_raw 13027 0
snd_timer 28931 2 snd_pcm,snd_seq
snd_seq_device 14172 3 snd_seq_midi,snd_rawmidi,snd_seq
iwlwifi 366509 0
mac80211 436493 1 iwlwifi
snd 62218 16
snd_hda_codec_realtek,snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec,snd_hwdep,snd_pcm,sn
d_rawmidi,snd_seq,snd_timer,snd_seq_device
ideapad_laptop 17890 0
sparse_keymap 13658 1 ideapad_laptop
cfg80211 178877 2 iwlwifi,mac80211
ir_lirc_codec 12739 0
lirc_dev 18700 1 ir_lirc_codec
soundcore 14635 1 snd
snd_page_alloc 14108 2 snd_hda_intel,snd_pcm
ir_mce_kbd_decoder 12681 0
ir_sony_decoder 12462 0
ir_jvc_decoder 12459 0
ir_rc6_decoder 12459 0
ir_rc5_decoder 12459 0
rc_rc6_mce 12454 0
ir_nec_decoder 12459 0
video 19115 1 nouveau
ene_ir 18019 0
rc_core 21263 10
ir_lirc_codec,ir_mce_kbd_decoder,ir_sony_decoder,ir_jvc_decoder,ir_rc6_decoder,ir_rc5_decoder,rc_rc6_mce,ir_nec_decoder,ene_ir
bnep 17830 2
rfcomm 38139 0
parport_pc 32114 0
bluetooth 158479 10 bnep,rfcomm
ppdev 12849 0
binfmt_misc 17292 1
mac_hid 13077 0
lp 17455 0
parport 40930 3 parport_pc,ppdev,lp
tg3 141414 0
nm-tool:
NetworkManager Tool
State: connected (global)
- Device: eth0 -----------------------------------------------------------------
Type: Wired
Driver: tg3
State: unavailable
Default: no
HW Address: 00:23:5A:CC:85:BD
Capabilities:
Carrier Detect: yes
Wired Properties
Carrier: off
- Device: wlan0 [Dyno] --------------------------------------------------------
Type: 802.11 WiFi
Driver: iwlwifi
State: connected
Default: yes
HW Address: 00:22:FA:D0:94:CA
Capabilities:
Speed: 150 Mb/s
Wireless Properties
WEP Encryption: yes
WPA Encryption: yes
WPA2 Encryption: yes
Wireless Access Points (* = current AP)
*Dyno: Infra, CC:5D:4E:46:0A:93, Freq 2412 MHz, Rate 54 Mb/s, Strength 81 WPA2
IPv4 Settings:
Address: 10.0.0.43
Prefix: 24 (255.255.255.0)
Gateway: 10.0.0.1
DNS: 10.0.0.1
Existe um bug comum com o com wireless-N, então teremos que desativá-lo.
Tente o seguinte:
sudo modprobe -r iwlwifi && sudo modprobe iwlwifi 11n_disable=1
Verifique sua velocidade sem fio. Se melhorar, faça o seguinte para torná-lo permanente:
sudo sh -c 'echo "options iwlwifi 11n_disable=1" >> /etc/modprobe.d/iwlwifi.conf'