11
Dec
2014

Intel Dual Band Wireless-AC 7260 (7260HMW) on Ubuntu Server: 5GHz WiFi Issues!

Today I received my long awaited dual-band WiFi card for the Intel NUC DN2820FYKH. The included Intel 7260bn card was absolutely hopeless since it was only a single-band 2.4GHz card, and I wanted to make use of my 5GHz connection as it was a lot less cluttered.

So I installed the card into the NUC, and it called itself wlan2 (I had been trying a few other cards out), and could see and connect to my 2.4GHz network just fine:

Screenshot - 111214 - 20:04:50

I then realised that I could not see the 5GHz network. My Nexus 7 was connected to it fine with full signal, so I expected this to be able to pick it up with no problems.

So I did what anybody else does, and asked Google. There seemed to be an issue with the current stable kernel and the WiFi driver that was being loaded, so I went and installed the 3.18 kernel and checked which WiFi driver was being loaded with dmesg | grep iwlwifi:


[ 4.682014] iwlwifi 0000:02:00.0: irq 91 for MSI/MSI-X
[ 4.692104] iwlwifi 0000:02:00.0: loaded firmware version 23.10.10.0 op_mode iwlmvm
[ 4.751408] iwlwifi 0000:02:00.0: Detected Intel(R) Dual Band Wireless AC 7260, REV=0x144
[ 4.752169] iwlwifi 0000:02:00.0: L1 Enabled – LTR Enabled
[ 4.752415] iwlwifi 0000:02:00.0: L1 Enabled – LTR Enabled
[ 5.129690] iwlwifi 0000:02:00.0 wlan2: renamed from wlan0

I checked on the main driver developer page here and confirmed that I had the latest version (at this time of writing), the 23.10.10 version. So I rebooted and I could still not see the 5GHz band. I checked that the card supported 5GHz with iwlist wlan2 channel:

Screenshot - 111214 - 20:12:59

And all the supported channels appeared! What’s going on!?!? I thought that they would have fixed these strange issues by now. I guess I’ll just have to keep checking if theres an update every time the kernel gets updated. This card is still miles better than the last one though, but that’s not saying a huge amount.

Also, to make the WiFI much more stable and to stop it disconnecting, turn off power management by adding wireless-power off to your /etc/network/interfaces file.

If there is a way to get 5GHz working properly on the Intel 7260 ac Dual-Band card, please let me know and I will post a fix!

Intel NUC DN2820FYKH Geekbench Problem
NUC 5GHz WiFI Update!

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