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I am running Ubuntu 14.04.01 LTS on an Acer V Nitro laptop which has an Intel Dual Band Wireless 7265 controller. The driver version is 3.13.0-45-generic with firmware 22.24.8.0. The connection is stable for 30-40 minutes and after, it disconnects. Are necessary several reconnect attempts, sometime a restart in order to reconnect to the WiFi network.

Did anyone face this issue with this controller? What do you recommend to diagnose the issue?

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up vote 4 down vote accepted

The root cause is described in this blog post It seems that there are some bugs in the Intel iwlwifi driver for 802.11N protocol for the kernel/firmware versions 3.13.0-45-generic/22.24.8.0. The temporary solution it is to disable 802.11N which is an work-around until the issue will be fixed. That means that I will not use the full capacity of the 7265 controller, which will be limited to 54MBs.

sudo sh -c 'echo "options iwlwifi 11n_disable=1" >> /etc/modprobe.d/iwlwifi.conf'
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Just wanted to say I had the same issue in Ubuntu 15.04 on a Lenovo X1 Carbon (Latest) and this workaround resolved the issue for me. – levlaz Jul 5 '15 at 14:49
    
54MB/s is way better than the intermittent and incredibly frustrating 0MB/s I have been experiencing... especially given I am paying for 250... – Ajax Jul 27 '16 at 6:14
    
Hm. It seems the disable=8 option works better for me; on ubuntu 16.04 – Ajax Jul 27 '16 at 7:11
    
I also have the last supported version of firmware for this device from wireless.wiki.kernel.org/en/users/drivers/iwlwifi Note how 7260 and 7265 are explicitly called out for "not going to receive any updates anymore". Boooo. – Ajax Jul 27 '16 at 7:13
    
Actually, I was able to download newer firmware from the git repo, which made my connection both reliable and faster, without these workaround. I posted the full instructions as an answer, which I suggest anybody reading this tries if they have a 7260, 7265 or 7265D device – Ajax Jul 27 '16 at 7:29
up vote 3 down vote

A lot of Intel wifi cards exhibit this issue until you echo "options iwlwifi 11n_disable=8" | sudo tee -a /etc/modprobe.d/iwlwifi.conf and reboot

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zeroset.mnim.org/2014/04/22/… I looked to the traces from /var/log/syslog and they match the same use-case. – garzanti Feb 9 '15 at 22:12
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It didn't helped, but your hint sent me to the blog above, which looks my case too. I've set 11n_disable=1, and it should work... – garzanti Feb 9 '15 at 22:39
    
Good and kernel and firmware updates might help as that is one of the newer intel wifi cards – Jeremy31 Feb 9 '15 at 23:28
up vote 0 down vote

Wheeee! After a couple hours putzing around on the Internet, I found a solution that works for 7260/7265 with even newer firmware for 7265D devices.

Per the official driver page: https://wireless.wiki.kernel.org/en/users/drivers/iwlwifi

7260 and 7265 will not be supported by the newest firmware versions: the last firmware that was released for these devices is -17.ucode. Bug fixes will be ported to -17.ucode. Note that 7265D can run later firmware versions. In order to determine if your 7265 device is a 'D' version, you can check the dmesg output:

Detected Intel(R) Dual Band Wireless AC 7265, REV=0x210 The revision number of a 7265D device is 0x210, if you see any other number, you have a 7265 device.

So, I ran dmesg | grep Wireless and saw I did have device code 0x210.

As such, I was able to use https://github.com/OpenELEC/iwlwifi-firmware/blob/master/firmware/iwlwifi-7265D-21.ucode

**If you do not have a 7265D per the dmesg command above, instead use: ** https://github.com/OpenELEC/iwlwifi-firmware/blob/master/firmware/iwlwifi-7265D-17.ucode

Next, I had a look in /lib/firmware, and noticed that I only had the -16.ucode file. So, I went to the git repo, downloaded the file from git, then used: sudo cp ~/Downloads/iwlwifi-726* /lib/firmware restarted my wifi, and actually got a usable connection!

Note that I tried both 11n_disable=8 and 11n_disable=1 (tried each one separately) to no avail. With this updated firmware, I was able to remove these workarounds.

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Note that if your kernel version is < 4.3, you probably won't be able to load the latest firmware, but I don't have an old enough install to test. – Ajax Jul 27 '16 at 7:39
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I have a non-software solution for that. Warming up the machine. Yes you're seeing it right. In the beginning my laptop (ASUS UX305FA) could not connect to some specific WIFI device. one day I just put it in the soft-case and brought it around, the machine was a little bit warmer than before. Suddenly it connected to the WIFI network which was not able to link. This is more like a magic trick but it works for me... and I am using that WIFI spot now.

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:) interesting solution, but the issue is already fixed with the new kernel deployed in the Ubuntu 15.10 version. The driver is workin quite fine now. – garzanti Feb 23 '16 at 13:30
    
That's nice to hear. But I am the fan of LTE so I will look forward to 16.04 :) – MTP1984 Feb 24 '16 at 10:23
    
Sorry, but warming up your computer might have helped whatever was wrong with your machine, but this is in no way related to this issue. My machine is plenty hot most of the time, and still suffers from this problem until I used the accepted solution. – Ajax Jul 27 '16 at 6:13

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