Ytdyklly

I've configured my laptop to do nothing when the lid is closed, by setting Suspend when laptop lid is closed to off in GNOME TWEAKS and overall it works fine (I'm running on Ubuntu 18.04.1). However, as soon as I close the lid (I have an external screen), the WiFi disconnects and the WiFi card isn't detected anymore afterwards, so I have to reboot my computer to make it work. This seems like a common problem online, but I haven't figured out how to solve it in my case, although trying the following:

1) set HandleLidSwitch=ignore and HandleLidSwitchDocked=ignore in /etc/systemd/logind.conf as well as IgnoreLid=true in /etc/UPower/UPower.conf and then run sudo service systemd-logind restart

2) options iwlwifi 11n_disable=1 in /etc/modprobe.d/iwlwifi.conf

3) wifi.powersave = 2 is set in /etc/NetworkManager/conf.d/default-wifi-powersave-on.conf 

I've run dmesg after closing the lid to identify potential erros, and something interesting appeared (last 5 lines):

[   64.383073] uvcvideo 2-5:1.0: Entity type for entity Extension 4 was not initialized!

[   64.383076] uvcvideo 2-5:1.0: Entity type for entity Extension 3 was not initialized!

[   64.383078] uvcvideo 2-5:1.0: Entity type for entity Processing 2 was not initialized!

[   64.383080] uvcvideo 2-5:1.0: Entity type for entity Camera 1 was not initialized!

[   64.383168] input: Integrated_Webcam_HD: Integrate as /devices/pci0000:00/0000:00:14.0/usb2/2-5/2-5:1.0/input/input21

[   67.605678] usb 2-6: USB disconnect, device number 5

[   67.609187] **acpi device:28: Cannot transition to power state D3hot for parent in (unknown)**

[   67.610701] **acpi device:28: Cannot transition to power state D3hot for parent in (unknown)**

[   67.648278] **iwlwifi 0000:02:00.0: RF_KILL bit toggled to disable radio.**

[   67.648280] **iwlwifi 0000:02:00.0: reporting RF_KILL (radio disabled)**

[   67.648861] wlan0: deauthenticating from e4:9e:12:c8:74:48 by local choice (Reason: 3=DEAUTH_LEAVING)

To help you solve my problem, I've run few commands on my configuration:

1) about the wireless card and drivers, lspci -nnk | grep 0280 -A3 returns:

02:00.0 Network controller [0280]: Intel Corporation Wireless 7260 [8086:08b1] (rev 73)

    Subsystem: Intel Corporation Dual Band Wireless-N 7260 [8086:4460]

    Kernel driver in use: iwlwifi

    Kernel modules: iwlwifi

2) in addition, sudo lshw -C network returns:

 *-network                 

       description: Wireless interface

       product: Wireless 7260

       vendor: Intel Corporation

       physical id: 0

       bus info: pci@0000:02:00.0

       logical name: wlan0

       version: 73

       serial: fc:f8:ae:80:e9:cc

       width: 64 bits

       clock: 33MHz

       capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless

       configuration: broadcast=yes driver=iwlwifi driverversion=4.15.0-43-generic firmware=17.948900127.0 ip=192.168.1.5 latency=0 link=yes multicast=yes wireless=IEEE 802.11

3) rfkill list all returns:

0: dell-rbtn: Wireless LAN

    Soft blocked: no

    Hard blocked: no

1: hci0: Bluetooth

    Soft blocked: no

    Hard blocked: no

2: phy0: Wireless LAN

    Soft blocked: no

    Hard blocked: no

4) last, before closing the lid, dmesg | grep wifi returns:

[    5.768578] iwlwifi 0000:02:00.0: loaded firmware version 17.948900127.0 op_mode iwlmvm

[    5.816736] iwlwifi 0000:02:00.0: Detected Intel(R) Dual Band Wireless N 7260, REV=0x144

[    5.838698] iwlwifi 0000:02:00.0: base HW address: fc:f8:ae:80:e9:cc