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psiphi75
Asked: 2018-05-10 13:38:57 +0800 CST

Intel Dual Band Wireless-AC 7260 issues in Ubuntu 18.04

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I have a laptop with with the Intel Dual Band Wireless-AC 7260 and am running Ubuntu 18.04 (although the problem existed with 17.10 and I presume this is a general problem). At home the Wifi works well, however, on some networks it will intermittently disconnect. Using Gnome network manager and turning the Wi-fi off and back on could fix the issue, but not always. This could happen numerous times a day.

networking intel-wireless 18.04

2 Answers

  1. Best Answer

    After much research and reading the Kernel documentation on this, I found that making all the following changes work.

    Change the wi-fi country code (thanks to this post). As root edit /etc/default/crda and set the following to your country code:

    REGDOMAIN={ISO COUNTRY CODE}

    Disable Bluetooth, although this is a dual-band adapter, it's not good at handling Bluetooth and wi-fi at the same time. From the Kernel documentation:

    For users of these devices who have problems when Wi-Fi and Bluetooth are running concurrently, we suggest to disable BT Coex by loading iwlwifi with bt_coex_active=0 as a module parameter.

    Also from the Kernel documentation also discusses that the device does not handle 2.4 Ghz noise very well and recommends the following:

    - Disable Wi-Fi's power save (prevent the PCIe link to go to power save): power_save=0 module parameter for iwlmvm
- Disable USB3 in BIOS (if possible), it not, just stop using it
- Disable 40MHz on 2.4GHz: cfg80211_disable_40mhz_24ghz module parameter
- Use 5GHz band (on devices that support 5GHz operation)

    In a nutshell, I did not disable USB3 in BIOS. But did the others, to implement these changes add the following line to /etc/modprobe.d/iwlwifi.conf:

    options iwlwifi bt_coex_active=0 swcrypto=1 11n_disable=8

    UPDATE: Thanks to @chili555, the Kernel driver page appears to be out-dated/incorrect, the power_scheme value does not exists and appears that we should use power_save=0. Documentation updated.

    A good resource for debugging the iwlwifi driver is https://support.system76.com/articles/wireless/

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  2. You can fix this issue temporarily by running this code (The selected Country should support Dual-band 5Ghz US/DE/...):

     # iw reg set US

    or add this as a permanent solution:

    echo "COUNTRY=US" > /etc/sysconfig/regdomain

    And these code as check:

     # iw reg get
 # iw list
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