Unstable wifi with intel 8260 [8086:24f3] (rev 3a) on ubuntu 16.04 runnung on Lenovo

[dahumph]

Hi, I have a brand new Lenovo P50 with intel 8260 wifi. Using ubuntu 16.04 with kernel 4.4.0.31 generic. wifi often stops working or simply shows no networks in network mnager. from time to time the up and down arrows are display in the network manager, even with no network cable connected.

wget http://mirrors.kernel.org/ubuntu/pool/main/l/linux-firmware/linux-firmware_1.158_all.deb
sudo dpkg -i linux-firmware*.deb

has been done.

editing

/etc/default/crda
to my reg domain has no effect, still



sudo iw reg get

shows



country 00: DFS-UNSET
(2402 - 2472 @ 40), (6, 20), (N/A)
(2457 - 2482 @ 40), (6, 20), (N/A), PASSIVE-SCAN
(2474 - 2494 @ 20), (6, 20), (N/A), NO-OFDM, PASSIVE-SCAN
(5170 - 5250 @ 160), (6, 20), (N/A), PASSIVE-SCAN
(5250 - 5330 @ 160), (6, 20), (0 ms), DFS, PASSIVE-SCAN
(5490 - 5730 @ 160), (6, 20), (0 ms), DFS, PASSIVE-SCAN
(5735 - 5835 @ 80), (6, 20), (N/A), PASSIVE-SCAN
(57240 - 63720 @ 2160), (N/A, 0), (N/A)

using


sudo modprobe -r iwlwifi
sudo modprobe iwlwifi 11n_disable=1

solves the issue. so I tried to make it permanent with


sudo -i
echo "options iwlwifi 11n_disable=1" >> /etc/modprobe.d/iwlwifi.conf
exit

after reboot wifi n mode seems to be disabled, howeve, the problem comes back. only doing a manual


sudo modprobe -r iwlwifi
sudo modprobe iwlwifi 11n_disable=1

helps as long as I do do not reboot.

Any help is appreciated to establish a permanent fix

[jeremy31]

You will likely have to wait for updates to package network-manager and its counterparts for this issue to be fixed

[Keith_Helms]

jeremy31, I'm having similar problems with the Intel 7260 card. Is this a known bug and a fix is being worked on?

[dahumph]

thx for the reply, yes, will probably have to wait. but any idea how i can automate the fix i figured out in my post. its sort of annoying to every time after reboot unload and load back the kernel modules...

[jeremy31]

This is a known bug and it is in the process of being fixed. I have Ubuntu 16.04 on a couple laptops and am not affected by the bug

[Keith_Helms]

Is the bug specifically in the Intel iwlwifi driver/firmware or is it in Network Manager? I've seen some suggestions to use wicd instead of network manager and was wondering if that would do any good.