Networking (wifi) issue on new computer

[Zack_Newsham]

Hi All, I asked this question on askubuntu.com a few days ago (http://askubuntu.com/questions/42092...with-12-04-lts), but got no responses so I thought I'd try here. I built a new computer recently, and while almost everything works, networking does not. I cannot get a wired, or wireless connection - though interestingly I can connect by plugging in my iPhone.

I moved house yesterday and no longer have wired access - so I am putting that on hold for now. This post is about the wifi.

My wifi card is: TP-link WDN4800

running dmesg gives:

[  835.322749] ath: phy0: Failed to stop TX DMA, queues=0x001!
[  836.295689] wlan0: authenticate with 08:76:ff:c8:67:d0
[  836.303592] wlan0: direct probe to 08:76:ff:c8:67:d0 (try 1/3)
[  836.507237] wlan0: direct probe to 08:76:ff:c8:67:d0 (try 2/3)
[  836.711325] wlan0: direct probe to 08:76:ff:c8:67:d0 (try 3/3)
[  836.915507] wlan0: authentication with 08:76:ff:c8:67:d0 timed out
[  837.344859] ath: phy0: DMA failed to stop in 10 ms AR_CR=0x00000024 AR_DIAG_SW=0x02000020 DMADBG_7=0x00026800
[  837.516237] ath: phy0: Failed to stop TX DMA, queues=0x001!
[  837.580301] ath: phy0: Failed to stop TX DMA, queues=0x001!
[  837.592172] ath: phy0: DMA failed to stop in 10 ms AR_CR=0x00000024 AR_DIAG_SW=0x02000020 DMADBG_7=0x00026800
[  837.592205] ath: phy0: Could not stop RX, we could be confusing the DMA engine when we start RX up
[  837.656339] ath: phy0: Failed to stop TX DMA, queues=0x001!
[  837.668245] ath: phy0: DMA failed to stop in 10 ms AR_CR=0x00000024 AR_DIAG_SW=0x02000020 DMADBG_7=0x00026800
[  837.668280] ath: phy0: Could not stop RX, we could be confusing the DMA engine when we start RX up
[  837.732029] ath: phy0: Failed to stop TX DMA, queues=0x001!
[  837.743565] ath: phy0: DMA failed to stop in 10 ms AR_CR=0x00000024 AR_DIAG_SW=0x02000020 DMADBG_7=0x00006400
[  837.743587] ath: phy0: Could not stop RX, we could be confusing the DMA engine when we start RX up
[  837.808400] ath: phy0: Failed to stop TX DMA, queues=0x001!
[  837.820465] ath: phy0: DMA failed to stop in 10 ms AR_CR=0x00000024 AR_DIAG_SW=0x02000020 DMADBG_7=0x00024e00
[  837.820501] ath: phy0: Could not stop RX, we could be confusing the DMA engine when we start RX up
[  837.884470] ath: phy0: Failed to stop TX DMA, queues=0x001!
[  837.896318] ath: phy0: DMA failed to stop in 10 ms AR_CR=0x00000024 AR_DIAG_SW=0x02000020 DMADBG_7=0x00006400
[  837.896354] ath: phy0: Could not stop RX, we could be confusing the DMA engine when we start RX up
[  837.960517] ath: phy0: Failed to stop TX DMA, queues=0x001!
[  837.972402] ath: phy0: DMA failed to stop in 10 ms AR_CR=0x00000024 AR_DIAG_SW=0x02000020 DMADBG_7=0x00006400
[  837.972436] ath: phy0: Could not stop RX, we could be confusing the DMA engine when we start RX up
[  838.036558] ath: phy0: Failed to stop TX DMA, queues=0x001!
[  838.100608] ath: phy0: Failed to stop TX DMA, queues=0x001!
[  838.112503] ath: phy0: DMA failed to stop in 10 ms AR_CR=0x00000024 AR_DIAG_SW=0x02000020 DMADBG_7=0x00026e00
[  838.112533] ath: phy0: Could not stop RX, we could be confusing the DMA engine when we start RX up
[  838.176699] ath: phy0: Failed to stop TX DMA, queues=0x001!
[  838.188617] ath: phy0: DMA failed to stop in 10 ms AR_CR=0x00000024 AR_DIAG_SW=0x02000020 DMADBG_7=0x00006400
[  838.188646] ath: phy0: Could not stop RX, we could be confusing the DMA engine when we start RX up
[  838.252692] ath: phy0: Failed to stop TX DMA, queues=0x001!
[  838.264553] ath: phy0: DMA failed to stop in 10 ms AR_CR=0x00000024 AR_DIAG_SW=0x02000020 DMADBG_7=0x00006400
[  838.264585] ath: phy0: Could not stop RX, we could be confusing the DMA engine when we start RX up
[  841.309136] wlan0: deauthenticating from 08:76:ff:c8:67:d0 by local choice (reason=3)
[  841.478857] ath: phy0: Failed to stop TX DMA, queues=0x001!
[  841.490702] ath: phy0: DMA failed to stop in 10 ms AR_CR=0x00000024 AR_DIAG_SW=0x02000020 DMADBG_7=0x00006400
[  841.490737] ath: phy0: Could not stop RX, we could be confusing the DMA engine when we start RX up
[  841.558863] ath: phy0: Failed to stop TX DMA, queues=0x001!
[  841.570786] ath: phy0: DMA failed to stop in 10 ms AR_CR=0x00000024 AR_DIAG_SW=0x02000020 DMADBG_7=0x00026800
[  841.570823] ath: phy0: Could not stop RX, we could be confusing the DMA engine when we start RX up
[  841.634987] ath: phy0: Failed to stop TX DMA, queues=0x001!
[  841.646875] ath: phy0: DMA failed to stop in 10 ms AR_CR=0x00000024 AR_DIAG_SW=0x02000020 DMADBG_7=0x00006400
[  841.646910] ath: phy0: Could not stop RX, we could be confusing the DMA engine when we start RX up
[  841.710992] ath: phy0: Failed to stop TX DMA, queues=0x001!
[  841.774983] ath: phy0: Failed to stop TX DMA, queues=0x001!
[  841.786866] ath: phy0: DMA failed to stop in 10 ms AR_CR=0x00000024 AR_DIAG_SW=0x02000020 DMADBG_7=0x00006400
[  841.786896] ath: phy0: Could not stop RX, we could be confusing the DMA engine when we start RX up
[  841.851053] ath: phy0: Failed to stop TX DMA, queues=0x001!
[  841.862974] ath: phy0: DMA failed to stop in 10 ms AR_CR=0x00000024 AR_DIAG_SW=0x02000020 DMADBG_7=0x00006400
[  841.863006] ath: phy0: Could not stop RX, we could be confusing the DMA engine when we start RX up
[  841.927042] ath: phy0: Failed to stop TX DMA, queues=0x001!
[  841.938943] ath: phy0: DMA failed to stop in 10 ms AR_CR=0x00000024 AR_DIAG_SW=0x02000020 DMADBG_7=0x00026e00
[  841.938974] ath: phy0: Could not stop RX, we could be confusing the DMA engine when we start RX up
[  842.003202] ath: phy0: Failed to stop TX DMA, queues=0x001!
[  842.067251] ath: phy0: Failed to stop TX DMA, queues=0x001!
[  842.079114] ath: phy0: DMA failed to stop in 10 ms AR_CR=0x00000024 AR_DIAG_SW=0x02000020 DMADBG_7=0x00006400
[  842.079147] ath: phy0: Could not stop RX, we could be confusing the DMA engine when we start RX up
[  842.143292] ath: phy0: Failed to stop TX DMA, queues=0x001!
[  842.155151] ath: phy0: DMA failed to stop in 10 ms AR_CR=0x00000024 AR_DIAG_SW=0x02000020 DMADBG_7=0x00026800
[  842.155182] ath: phy0: Could not stop RX, we could be confusing the DMA engine when we start RX up
[  842.219331] ath: phy0: Failed to stop TX DMA, queues=0x001!
[  842.231204] ath: phy0: DMA failed to stop in 10 ms AR_CR=0x00000024 AR_DIAG_SW=0x02000020 DMADBG_7=0x00006400
[  842.231232] ath: phy0: Could not stop RX, we could be confusing the DMA engine when we start RX up

repeated several times. I have looked around trying different solutions, but none have currently worked. Needless to say it is annoying having to leave my phone plugged in to get internet access on this machine. Does anyone have any idea how to fix this?

Thanks in advance.

[varunendra]

Welcome to Ubuntu Forums Zack_Newsham !

Please follow the "Wireless Script" link in my signature, download and run the script as per instructions there, and post back the report it generates.

While posting the outputs, please use 'Code' tags. It preserves the output's formatting and makes the post cleaner, compact and more readable. To see a quick 'HowTo' with screenshots, please follow the "Using Code Tags" link in my signature.

[Zack_Newsham]

I probably should have mentioned before, that I see the wireless networks and am even prompted for my password (repeatedly at ~5 minute intervals) but I never get a connection. eth0 below is my iPhone.

http://pastebin.ubuntu.com/6947047/

[Bucky Ball]

Try opening /etc/network/interfaces with:

sudo nano /etc/network/interfaces

and change this:

auto lo
iface lo inet loopback
iface eth0 inet dhcp

... to this:

auto lo
iface lo inet loopback
iface wlan0 inet dhcp

Reboot. It may or may not work, but a quick shot in the dark. If it doesn't, change it back.

[Zack_Newsham]

Try opening /etc/network/interfaces with:

sudo nano /etc/network/interfaces

and change this:

auto lo
iface lo inet loopback
iface eth0 inet dhcp

... to this:

auto lo
iface lo inet loopback
iface wlan0 inet dhcp

Reboot. It may or may not work, but a quick shot in the dark. If it doesn't, change it back.

Thanks for trying, but it had no affect.

[wildmanne39]

In the /etc/network/interfaces file

iface eth0 inet dhcp

needs to be removed, the file should only have:

auto lo
iface lo inet loopback

then reboot.

Also run these commands one at a time:

echo "options ath9k nohwcrypt=1" | sudo tee /etc/modprobe.d/ath9k.conf
sudo modprobe -rfv ath9k
sudo modprobe -v ath9k

In your router change the encryption to just wpa2 AES CCSM if you have that option.
Thanks

[Zack_Newsham]

In the /etc/network/interfaces file

iface eth0 inet dhcp

needs to be removed, the file should only have:

auto lo
iface lo inet loopback

then reboot.

Also run these commands one at a time:

echo "options ath9k nohwcrypt=1" | sudo tee /etc/modprobe.d/ath9k.conf
sudo modprobe -rfv ath9k
sudo modprobe -v ath9k

In your router change the encryption to just wpa2 AES CCSM if you have that option.
Thanks

Thanks, but no luck - also I can't change wifi settings (I dont control it).

[wildmanne39]

While your computer was off did you unplug your iphone? you can not use wifi and iphone at the same time.

Shutdown then unplug iphone, boot up, if it does not connect post a new wireless file?

Are you in Australia?
Thanks

[Zack_Newsham]

Still nothing unfortunately, no - I'm in Canada.

http://pastebin.ubuntu.com/6947405

[Bucky Ball]

Well, that is very odd, because I thought you were one of my country people. Your wireless output shows this:

country AU:
	(2402 - 2482 @ 40), (N/A, 20)
	(5170 - 5250 @ 40), (3, 23)
	(5250 - 5330 @ 40), (3, 23), DFS
	(5735 - 5835 @ 40), (3, 30)

According to your system, at least wifi, you're in Aus. That is why Wild Man assumed as much ...