trouble with wifi connection on ubuntu 11.04
 

Have installed Ubuntu 11.04 on my Toshiba Satellite A100-250 laptop.
Had to choose Ubuntu Classic on startup since Unity apparently was not supported by the hardware.After doing so it performed good.
However, connecting via the built in wireless adapter proved shaky. Some sites loaded fast, while others took considerable time or even did not load at all.
Adapter is Atheros ARC 2413 802.11bg NIC (rev. 01)
Connecting to the router via a cable is problem-less, all sites load quickly and look fine.
Is there a known solution to this problem ?

Welcome to LQ. You might want to look in the networking and hardware forums for some additional solutions. If you haven't been there yet, there is also ubuntuforums and it has an upgrade and installation section. I have been hearing of a lot of problems with Ubuntu 11.04 and wireless, though I haven't heard of any explanations. It had been my experience that since about Ubuntu 9.04 that wireless pretty much worked out of the box. Here are a couple of other suggestions:

1) Look to see what driver is recommended for your system. The big names seem to be atheros and madwifi. One of those will probably support you. Then see which one you are using (use sudo lspci) and verify that it is the right one. If not, you should be able to find the correct driver and some installation instructions, which usually include "blacklisting" the default driver to avoid conflict.

2) In Ubunut, it seems that they often times have what are called wireless backport modules. I had some problems with wireless disconnecting all the time and I installed these and it cleared it up. You will need to install them through Synaptic as they aren't installed by default

Thanks for taking time to answer.
I'll check out the suggestions.

use WICD

I'm new to Linux, would not know how to use it.

Noway2 hit the nail on the head about the drivers; Can you provide us with the output of the following command?
It is definitely a driver issue; I just need to know which one is being used, and I can go from there.

To add one extra thing to that - I use compat-wireless for my drivers, since they are always being worked on, and to me personally, it is more centralized, and easy to follow the source tree. I'm not saying to straight up use compat-wireless, but going along that trail, you could always compile a specific type of driver for your device, especially if you want to just try it out. Now that being said, I do recommend installing the latest version of drivers for your device. Hence, that's why I want the output of lsmod so I can help you out with that part.

Cheers,

Josh

this post seems similar:
http://www.linuxquestions.org/questi...3/#post4247767

output of lsmod:

stuart@laptopsjm:~$ lsmod
Module Size Used by
cryptd 19801 0
aes_i586 16956 1
aes_generic 38023 1 aes_i586
binfmt_misc 13213 1
parport_pc 32111 0
ppdev 12849 0
dm_crypt 22463 0
snd_hda_codec_realtek 255820 1
snd_hda_codec_si3054 12924 1
snd_hda_intel 24140 5
snd_hda_codec 90901 3 snd_hda_codec_realtek,snd_hda_codec_si3054,snd_hda_intel
snd_hwdep 13274 1 snd_hda_codec
arc4 12473 2
snd_pcm 80244 5 snd_hda_codec_si3054,snd_hda_intel,snd_hda_codec
pcmcia 39671 0
joydev 17322 0
snd_seq_midi 13132 0
ath5k 144412 0
yenta_socket 27230 0
snd_rawmidi 25269 1 snd_seq_midi
snd_seq_midi_event 14475 1 snd_seq_midi
ath 19141 1 ath5k
snd_seq 51291 2 snd_seq_midi,snd_seq_midi_event
mac80211 257001 1 ath5k
snd_timer 28659 2 snd_pcm,snd_seq
snd_seq_device 14110 3 snd_seq_midi,snd_rawmidi,snd_seq
psmouse 73312 0
cfg80211 156212 3 ath5k,ath,mac80211
serio_raw 12990 0
i2c_piix4 13095 0
snd 55295 18 snd_hda_codec_realtek,snd_hda_codec_si3054,snd_hda_intel,snd_hda_codec,snd_hwdep,snd_pcm,snd_rawmidi ,snd_seq,snd_timer,snd_seq_device
soundcore 12600 1 snd
pcmcia_rsrc 18292 1 yenta_socket
snd_page_alloc 14073 2 snd_hda_intel,snd_pcm
pcmcia_core 21505 3 pcmcia,yenta_socket,pcmcia_rsrc
shpchp 32345 0
lp 13349 0
parport 36746 3 parport_pc,ppdev,lp
dm_raid45 88410 0
xor 21860 1 dm_raid45
btrfs 527341 0
zlib_deflate 26594 1 btrfs
libcrc32c 12543 1 btrfs
radeon 896428 2
ttm 65184 1 radeon
drm_kms_helper 40745 1 radeon
8139too 23208 0
firewire_ohci 31504 0
drm 180037 4 radeon,ttm,drm_kms_helper
firewire_core 56138 1 firewire_ohci
8139cp 22497 0
pata_atiixp 12968 0
crc_itu_t 12627 1 firewire_core
sata_sil 13278 2
ati_agp 13202 0
i2c_algo_bit 13184 1 radeon
ramzswap 13202 0
xvmalloc 13453 1 ramzswap
stuart@laptopsjm:~$

Meanwhile I installed wicd which now seems to run together with networkmanager. Must sort this out yet.
Wired connection is still superior at this stage.

According to the output, your using the ath5k. The lists show that the ath5k supports the 2413. As I mentioned, there have been a lot of reports with Ubuntu 11.04 and wireless problems. Corp769 really seems to know what they are doing and may be able to provide you with better assistance than I can. In the mean time have a look at the links shown here: http://lmgtfy.com/?q=2413+802.11bg+linux+ubuntu+11.04 Yes, that is the "let me google that for you" link. I am not using that to try to be rude, please don't be offended. It used it so that you could duplicate the search that I performed that seems to have a good mix of potential answers as well as confirmation from Launchpad of what the bug is.

Can you also post the output of lspci for me? I forgot to ask that before, I want to match the vendor ID for the exact device you have. Once I have that, I will be able to lead you in the right direction that you need to take in order to get it going again.

Cheers,

Josh

stuart@laptopsjm:~$ lspci
00:00.0 Host bridge: ATI Technologies Inc Device 5a31 (rev 01)
00:01.0 PCI bridge: ATI Technologies Inc RS480 PCI Bridge
00:12.0 IDE interface: ATI Technologies Inc IXP SB400 Serial ATA Controller (rev 80)
00:13.0 USB Controller: ATI Technologies Inc IXP SB400 USB Host Controller (rev 80)
00:13.1 USB Controller: ATI Technologies Inc IXP SB400 USB Host Controller (rev 80)
00:13.2 USB Controller: ATI Technologies Inc IXP SB400 USB2 Host Controller (rev 80)
00:14.0 SMBus: ATI Technologies Inc IXP SB400 SMBus Controller (rev 82)
00:14.1 IDE interface: ATI Technologies Inc IXP SB400 IDE Controller (rev 80)
00:14.2 Audio device: ATI Technologies Inc IXP SB4x0 High Definition Audio Controller (rev 01)
00:14.3 ISA bridge: ATI Technologies Inc IXP SB400 PCI-ISA Bridge (rev 80)
00:14.4 PCI bridge: ATI Technologies Inc IXP SB400 PCI-PCI Bridge (rev 80)
01:05.0 VGA compatible controller: ATI Technologies Inc RC410 [Radeon Xpress 200M]
02:04.0 Ethernet controller: Atheros Communications Inc. AR2413 802.11bg NIC (rev 01)
02:06.0 CardBus bridge: ENE Technology Inc CB1410 Cardbus Controller (rev 01)
02:07.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+ (rev 10)
02:0a.0 FireWire (IEEE 1394): Texas Instruments TSB43AB21 IEEE-1394a-2000 Controller (PHY/Link)
stuart@laptopsjm:~$

Hello,

As seen here - https://bugs.launchpad.net/ubuntu/+s...ux/+bug/568090 - Try using your drivers with the nohwcrypt option and see if it helps, as this is a known problem with your drivers. Let me know if it works out for you, since I read that it might or might not work.

Cheers,

Josh

Thanks so much.
I will try that and report.

I did the command:
sudo modprobe ath5k nohwcrypt

Connecting to the wireless network again produced slow or non-loading pages.

Seems not to work for me.

similair problem with Vaio VGN-FJ66GP-W, Natty
 

Relatively new-ish to Ubuntu and Linux systems. I just upgraded from 10.10 LTS (lucid) to 11.04 Natty (complete re-partition from scratch- so no leftovers). Now I have some pretty serious problems with NATTY 's wifi

1. I could not signal in the rooms I was getting wifi signal previously with 10.10 LTS. I rummaged around the forums and the internet a lot. Tried several things but nothing worked.

2. So I resigned myself to using the laptop in the same room as my wifi router (pointless tho). Now yesterday after downloading some files overnight. I switched it on and it will not connect to the router at all & not even the wired connection.

PLEASE HELP ME.. From my 2 weeks of reading and re-reading on the net about wifi & natty . I have put in the outputs of lspci & lsmod commands


lspci
00:00.0 Host bridge: Intel Corporation Mobile 915GM/PM/GMS/910GML Express Processor to DRAM Controller (rev 03)
00:02.0 VGA compatible controller: Intel Corporation Mobile 915GM/GMS/910GML Express Graphics Controller (rev 03)
00:02.1 Display controller: Intel Corporation Mobile 915GM/GMS/910GML Express Graphics Controller (rev 03)
00:1b.0 Audio device: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) High Definition Audio Controller (rev 03)
00:1d.0 USB Controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) USB UHCI #1 (rev 03)
00:1d.1 USB Controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) USB UHCI #2 (rev 03)
00:1d.2 USB Controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) USB UHCI #3 (rev 03)
00:1d.3 USB Controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) USB UHCI #4 (rev 03)
00:1d.7 USB Controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) USB2 EHCI Controller (rev 03)
00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev d3)
00:1f.0 ISA bridge: Intel Corporation 82801FBM (ICH6M) LPC Interface Bridge (rev 03)
00:1f.2 IDE interface: Intel Corporation 82801FBM (ICH6M) SATA Controller (rev 03)
00:1f.3 SMBus: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) SMBus Controller (rev 03)
06:08.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+ (rev 10)
06:09.0 CardBus bridge: Texas Instruments PCI7420 CardBus Controller
06:09.2 FireWire (IEEE 1394): Texas Instruments PCI7x20 1394a-2000 OHCI Two-Port PHY/Link-Layer Controller
06:09.3 Mass storage controller: Texas Instruments PCI7420/7620 Combo CardBus, 1394a-2000 OHCI and SD/MS-Pro Controller
06:0a.0 Ethernet controller: Atheros Communications Inc. Atheros AR5001X+ Wireless Network Adapter (rev 01)



lsmod
Module Size Used by
usb_storage 43946 0
uas 17676 0
binfmt_misc 13213 1
parport_pc 32111 0
ppdev 12849 0
snd_hda_codec_realtek 255820 1
snd_hda_intel 24140 2
snd_hda_codec 90901 2 snd_hda_codec_realtek,snd_hda_intel
arc4 12473 2
snd_hwdep 13274 1 snd_hda_codec
snd_pcm 80244 2 snd_hda_intel,snd_hda_codec
i915 450944 3
snd_seq_midi 13132 0
ath5k 144412 0
snd_rawmidi 25269 1 snd_seq_midi
ath 19141 1 ath5k
mac80211 257001 1 ath5k
snd_seq_midi_event 14475 1 snd_seq_midi
snd_seq 51291 2 snd_seq_midi,snd_seq_midi_event
drm_kms_helper 40745 1 i915
tifm_sd 17415 0
pcmcia 39671 0
joydev 17322 0
snd_timer 28659 2 snd_pcm,snd_seq
snd_seq_device 14110 3 snd_seq_midi,snd_rawmidi,snd_seq
drm 180037 4 i915,drm_kms_helper
cfg80211 156212 3 ath5k,ath,mac80211
tifm_7xx1 12898 0
yenta_socket 27230 0
sony_laptop 34432 0
snd 55295 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
tifm_core 15040 2 tifm_sd,tifm_7xx1
psmouse 73312 0
pcmcia_rsrc 18292 1 yenta_socket
pcmcia_core 21505 3 pcmcia,yenta_socket,pcmcia_rsrc
i2c_algo_bit 13184 1 i915
serio_raw 12990 0
soundcore 12600 1 snd
video 18951 1 i915
snd_page_alloc 14073 2 snd_hda_intel,snd_pcm
lp 13349 0
parport 36746 3 parport_pc,ppdev,lp
firewire_ohci 31504 0
8139too 23208 0
firewire_core 56138 1 firewire_ohci
8139cp 22497 0
crc_itu_t 12627 1 firewire_core