Dear Experts,

I would like to ask your advise on good reading about how to add WiFi device, and how to control its settings on CentOS.

Sounds really dumb, but this is what I am NOT able to do on CentOS 7 what I was able to do in the past, beginning somewhere since RedHat 5 or 6, through Fedora and up to CentOS 6.

In brief: my card is Intel 6235; CentOS 7 (fully updatted), latest kernel
(3.10.0-229.20.1), relevant Intel firmware version for my card is in
/lib/firmware (together with large bunch of other Intel WiFi firmware), relevant modules are loaded in kernel:

iwlwifi iwldvm mac80211
cfg80211

“/sbin/ifconfig -a” shows my device in the list renamed to wlp3s0
(according to PCI slot numbering I figure), dmesg shows device brought up successfully detected and renamed as above. lspci shows device with its correct full name (Network controller: Intel Corporation … 6235″

Now comes the fun part (no, troublesome for me part). When I click on the NetworkManager Applet in right top corner, there are no WiFi devices. I go to Network Settings from there. My device is in the list under name “PCI
Unknown”. I click on that, the device is described as “unmanaged”, and there is no way to make changes to the contrary to other devices (correct MAC address is displayed).

OK, I assume I just need to declare device as NM_CONTROLLED. There is no relevant /etc/sysconfig/ifcfg-wlp3s0 – where I know I can declare that. I
use “nmtui” to add configuration, then add to ifcfg-wlp3s0

NM_CONTROLLED=”yes”

line. Reboot. Still the same.

Just for comparison I booted Ubuntu 14.0.4 x86_64 live CD. Yes, it can see my wireless, and I can connect to WiFi networks. Kernel is just a notch newer (3.13.0.24) which shouldn’t matter according to Intel information which kernel versions this device is supported in. List of relevant kernel modules loaded by ubuntu is exactly the same. I don’t see anything weird like the need to separately load firmware as kernel module (yes, indeed I’m going nuts, that would be “freebsd-ism” I guess).

I do not want to have Ubuntu (or Debian which likely will work out of the box too) on this laptop. So, apparently I need a pointer to good reading on how do we do it on CentOS 7 “dirty way” – when “click here, choose in menu that” doesn’t work.

Thanks a lot for your advises!

Valeri

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Valeri Galtsev Sr System Administrator Department of Astronomy and Astrophysics Kavli Institute for Cosmological Physics University of Chicago Phone: 773-702-4247
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