Re: Tutorial Help - Can't detect wifi after reboot

[Jes Sorensen <jes.sorensen@gmail.com>]

On 02/13/15 12:12, Julia Lawall wrote:
> On Fri, 13 Feb 2015, Katherine Dunne wrote:
> 
>> I have been going through the tutorial, using Ubuntu 14.04.1
>> I am at the point under Test Your Changes under Modifying a Driver on Native
>> Linux.
>> Since rebooting, my computer can't detect wifi.
>> I noticed on rebooting a new message appeared "Bluetooth TX [hex address]
>> timeout," but after disabling bluetooth per another tutorial's suggestion,
>> the message does not appear, and there is still no wifi detected.
>>
>> The last time I succesfully rebooted and had a wifi connection was right
>> before cloning the staging repository in the Tool Set Up section.
>> Would it be helpful to list the commands that I've run between my two reboot
>> times?
>> The driver I modified was /drivers/net/hamradio/baycom_epp.c
> 
> Perhaps the kernel you are compiling does not have the wifi driver that
> the ubuntu kernel uses for your laptop?  Maybe it would help to use lspci
> with your ubuntu setup to see what wifi driver you are using, and then to
> see if that is in the configuration of the one that you are compiling?
> One could also wonder if the driver you modified is selected in the
> configuration of the kernel you are modifying.  When you compiled your
> kernel, did you get a file drivers/net/hamradio/baycom_epp.o?  If you did
> not, then your probably has nothing to do with your change, because you
> change is not even in the compiled kernel.  But they are probably not
> related in any case.

The wireless card could be either PCI or USB or SDIO, so if you run
'iw dev' as root, it should tell you the state of your device.

If nothing shows up in the output, try 'dmesg | grep wlan' and see if it
shows something.

It is very possible that you didn't include the wireless driver in the
kernel you built, as Julia points out.

Cheers,
Jes