Setup:: desktop, Dell Inspiron 530


OS:: Ubuntu 12.04


Wifi:: usb Rosewill RNX-150ube (I think the driver = r8712u)


Problem:: Wifi appears to work (full signal), but cannot connect to internet


Attempted Solutions (that failed):::::
sudo gedit /etc/modprobe.d/r8712u.conf
options r8712u 11n_disable=1


sudo gedit /etc/modprobe.d/iwlwifi.conf
options iwlwifi 11n_disable=1


Situation:: Wifi has been working for 2 months; went into suspend couple of days ago, and upon returning from suspend, wifi quit working, even after reboot.


Note#1:: (perhaps unrelated) after suspend, I have to unplug and replug my wifi usb; but this no longer is effective; and the fact that wifi doesn't work even after reboot is a completely new problem.


Note#2:: I have two installations of 12.04 on this computer. The internet still works on the other installation. So, if it would help, I can provide the terminal output for the installation that doesn't have an internet problem.


Terminal Output::::::::
.....for iwconfig




lo no wireless extensions.

wlan0 IEEE 802.11bgn ESSID:"Sandwich Log" Nickname:"rtl_wifi"
Mode:Managed Frequency:2.462 GHz Access Point: 00:24:01:7B:7D:58
Bit Rate:150 Mb/s Sensitivity:0/0
Retry:off RTS thr:off Fragment thr:off
Power Management:off
Link Quality=100/100 Signal level=73/100 Noise level=0/100
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0

eth0 no wireless extensions.




.....for ifconfig




eth0 Link encap:Ethernet HWaddr 00:1d:09:92:56:db
inet addr:192.168.0.14 Bcast:192.168.0.255 Mask:255.255.255.0
inet6 addr: fe80::21d:9ff:fe92:56db/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:8091 errors:0 dropped:0 overruns:0 frame:0
TX packets:6667 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:7401524 (7.4 MB) TX bytes:1084224 (1.0 MB)
Interrupt:20 Memory:fdfc0000-fdfe0000

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:16436 Metric:1
RX packets:1478 errors:0 dropped:0 overruns:0 frame:0
TX packets:1478 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:219401 (219.4 KB) TX bytes:219401 (219.4 KB)

wlan0 Link encap:Ethernet HWaddr 68:1c:a2:04:07:db
inet addr:192.168.0.15 Bcast:192.168.0.255 Mask:255.255.255.0
inet6 addr: fe80::6a1c:a2ff:fe04:7db/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:11 errors:0 dropped:1 overruns:0 frame:0
TX packets:43 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:4406 (4.4 KB) TX bytes:9890 (9.8 KB)




.....for lsmod




Module Size Used by
e1000e 139997 0
btrfs 638248 0
zlib_deflate 26622 1 btrfs
libcrc32c 12543 1 btrfs
ufs 78131 0
qnx4 13309 0
hfsplus 83544 0
hfs 49479 0
minix 31453 0
ntfs 100206 0
vfat 17308 0
msdos 17132 0
fat 55605 2 vfat,msdos
jfs 175085 0
xfs 747494 0
reiserfs 230943 0
ext2 67987 0
pci_stub 12550 1
vboxpci 22911 0
vboxnetadp 13328 0
vboxnetflt 27240 0
vboxdrv 252188 3 vboxpci,vboxnetadp,vboxnetflt
bnep 17830 2
rfcomm 38139 0
bluetooth 158479 10 bnep,rfcomm
parport_pc 32114 0
ppdev 12849 0
binfmt_misc 17292 1
snd_hda_codec_realtek 174313 1
joydev 17393 0
snd_hda_intel 32765 2
snd_hda_codec 109562 2 snd_hda_codec_realtek,snd_hda_intel
snd_hwdep 13276 1 snd_hda_codec
r8712u 163880 0
dcdbas 14098 0
snd_pcm 80916 2 snd_hda_intel,snd_hda_codec
wacom 51812 0
snd_seq_midi 13132 0
snd_rawmidi 25424 1 snd_seq_midi
snd_seq_midi_event 14475 1 snd_seq_midi
snd_seq 51592 2 snd_seq_midi,snd_seq_midi_event
snd_timer 28931 2 snd_pcm,snd_seq
snd_seq_device 14172 3 snd_seq_midi,snd_rawmidi,snd_seq
snd 62218 13 snd_hda_codec_realtek,snd_hda_intel,snd_hda_codec, snd_hwdep,snd_pcm,snd_rawmidi,snd_seq,snd_timer,sn d_seq_device
psmouse 86520 0
serio_raw 13027 0
mac_hid 13077 0
i915 419297 3
drm_kms_helper 45466 1 i915
drm 197641 4 i915,drm_kms_helper
soundcore 14635 1 snd
i2c_algo_bit 13199 1 i915
snd_page_alloc 14108 2 snd_hda_intel,snd_pcm
video 19068 1 i915
lp 17455 0
parport 40930 3 parport_pc,ppdev,lp
usbhid 41937 0
hid 77428 1 usbhid
firewire_ohci 40172 0
firewire_core 56940 1 firewire_ohci
crc_itu_t 12627 1 firewire_core
floppy 60184 0
usb_storage 39646 0




.....for nm-tool




NetworkManager Tool

State: connected (global)

- Device: wlan0 [Sandwich Log] ------------------------------------------------
Type: 802.11 WiFi
Driver: r8712u
State: connected
Default: no
HW Address: 68:1C:A2:04:07:DB

Capabilities:
Speed: 150 Mb/s

Wireless Properties
WEP Encryption: yes
WPA Encryption: yes
WPA2 Encryption: yes

Wireless Access Points (* = current AP)
2WIRE439: Infra, B8:E6:25:19:54:31, Freq 2432 MHz, Rate 54 Mb/s, Strength 42 WPA WPA2
2WIRE386: Infra, B8:E6:25:43:43:51, Freq 2437 MHz, Rate 54 Mb/s, Strength 42 WPA WPA2
2WIRE473: Infra, 74:9D:DC:9F:FB:49, Freq 2437 MHz, Rate 54 Mb/s, Strength 42 WPA WPA2
*Sandwich Log: Infra, 00:24:01:7B:7D:58, Freq 2462 MHz, Rate 54 Mb/s, Strength 100

IPv4 Settings:
Address: 192.168.0.15
Prefix: 24 (255.255.255.0)
Gateway: 192.168.0.1

DNS: 192.168.0.1


- Device: eth0 [Wired connection 1] -------------------------------------------
Type: Wired
Driver: e1000e
State: connected
Default: yes
HW Address: 00:1D:09:92:56:DB

Capabilities:
Carrier Detect: yes
Speed: 100 Mb/s

Wired Properties
Carrier: on

IPv4 Settings:
Address: 192.168.0.14
Prefix: 24 (255.255.255.0)
Gateway: 192.168.0.1

DNS: 192.168.0.1




.....for sudo lshw -C network




*-network
description: Ethernet interface
product: 82562V-2 10/100 Network Connection
vendor: Intel Corporation
physical id: 19
bus info: pci@0000:00:19.0
logical name: eth0
version: 02
serial: 00:1d:09:92:56:db
size: 100Mbit/s
capacity: 100Mbit/s
width: 32 bits
clock: 33MHz
capabilities: pm msi bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=e1000e driverversion=1.5.1-k duplex=full firmware=1.1-2 ip=192.168.0.14 latency=0 link=yes multicast=yes port=twisted pair speed=100Mbit/s
resources: irq:43 memory:fdfc0000-fdfdffff memory:fdfff000-fdffffff ioport:fe00(size=32)
*-network
description: Wireless interface
physical id: 1
bus info: usb@1:5.4
logical name: wlan0
serial: 68:1c:a2:04:07:db
capabilities: ethernet physical wireless
configuration: broadcast=yes driver=r8712u ip=192.168.0.15 multicast=yes wireless=IEEE 802.11bgn