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Author Topic: Ubuntu: My Wifi Connection gets corrupted after installing the video drivers  (Read 2787 times)
CYPER
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June 27, 2011, 05:13:33 PM
 #1

Ubuntu 11.04 32bit
TP-Link TL-WN821N which is listed HERE as supported using the ar9170usb driver.

So I've done 5 fresh reinstalls and each time after a specific step following THIS guide my Wireless connection gets corrupted and does not want to work.

The last time I did all the changes in small steps so I can catch the offending one and so after I've executed the code below and restarted my system the wifi went haywire:

Quote
cd ~
sudo apt-get install dkms
wget http://www2.ati.com/drivers/linux/ati-driver-installer-11-5-x86.x86_64.run
sudo sh ati-driver-installer-11-5-x86.x86_64.run --buildpkg Ubuntu/natty
sudo dpkg -i *.deb
sudo apt-get -f install
sudo aticonfig -f --initial --adapter=all
sudo reboot

On my next fresh installation all I did was:
Quote
wget http://www2.ati.com/drivers/linux/ati-driver-installer-11-5-x86.x86_64.run
sudo sh ati-driver-installer-11-3-x86.x86_64.run
sudo reboot

Up until that point everything was working just fine and I was remotely managing my desktop using a Windows VNC Viewer and Ubuntu Remote Desktop.

The Live version of Ubuntu creates no problem with my USB Wifi dongle as well.

I would like to stress out that my connection is configured properly and I am 100% certain of that - as I said it is working like a charm up until the point of installing the video driver and restarting.


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drawoc
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June 27, 2011, 05:35:46 PM
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Could you upload /var/log/kern.log, from after your wifi drivers don't work, to pastebin, and post a link here?
http://pastebin.com/
Thanks.

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CYPER
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June 27, 2011, 09:05:18 PM
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Before posting the log as I'm very busy with an exam at the moment I want to ask:

Is it somehow possible that this is a hardware problem? Is there any connection between the USB port and the PCI-E port?
The video card is plugged in the PCI-E x1 slot on the motherboard using this:



Can it be that after the video driver installation the card starts to consume more power from the motherboard and so it somehow affects the USB ports? I strongly doubt that but decided to ask.

The PSU is more than enough - Corsair HX850 for one card only.

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June 27, 2011, 10:10:41 PM
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Before posting the log as I'm very busy with an exam at the moment I want to ask:

Is it somehow possible that this is a hardware problem? Is there any connection between the USB port and the PCI-E port?
The video card is plugged in the PCI-E x1 slot on the motherboard using this:

Can it be that after the video driver installation the card starts to consume more power from the motherboard and so it somehow affects the USB ports? I strongly doubt that but decided to ask.

The PSU is more than enough - Corsair HX850 for one card only.

I highly doubt it. If you have no reason to believe that's the case (ex power light going off on wifi card when card plugged in), I would rule it out for now.

If you want to be sure this isn't the case, try plugging in another USB device, for example a Flash Drive, and see if it works. If it does, there's still power to USB.

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June 27, 2011, 10:22:04 PM
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I'm installing the Ubuntu from a flash drive to a flash drive, so the USB ports are definitely working. My concern was about the amount of power delivered to the ports, but if both USB flash drives work, then as you said it is highly unlikely that the USB Wifi Dongle is not getting enough power.

I will do more tests later on and will provide the logs.

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