RTL8812AU driver working no more after kernel 4.4.0-101-generic update

[[e-mail]]

My Edimax EW-7811UTC USB dongle worked quite well until kernel 4.4.0-98-generic.
After kernel was update to 4.4.0-101-generic version it stopped working.

DKMS still reports "rtl8812au, 4.3.8.12175.20140902+dfsg, 4.4.0-101-generic, x86_64: installed" but no trace of the network interface using iwconfig nor lshw, while lsusb output is:
Bus 001 Device 007: ID 7392:a812 Edimax Technology Co., Ltd

Further info:
lsb_release -rd:
Description: Ubuntu 16.04.3 LTS
Release: 16.04

Package name/version:
rtl8812au-dkms/4.3.8.12175.20140902+dfsg-0ubuntu2

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: rtl8812au-dkms 4.3.8.12175.20140902+dfsg-0ubuntu2
ProcVersionSignature: Ubuntu 4.4.0-101.124-generic 4.4.95
Uname: Linux 4.4.0-101-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia
ApportVersion: 2.20.1-0ubuntu2.12
Architecture: amd64
CurrentDesktop: X-Cinnamon
Date: Mon Nov 20 18:29:05 2017
InstallationDate: Installed on 2016-08-11 (466 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
PackageArchitecture: all
SourcePackage: rtl8812au
UpgradeStatus: No upgrade log present (probably fresh install)

[Jeremy (wa113y3s)]

andrea there is an issue involving dkms that causes the module to be build on the old kernel source rather than the new kernel. Open terminal and enter "modinfo 8812au" post the output

[[e-mail] (andrea.iacoponigmail.com)]

root@ubabbu16:~# modinfo 8812au
filename: /lib/modules/4.4.0-104-generic/updates/dkms/8812au.ko
version: v4.3.8_12175.20140902
author: Realtek Semiconductor Corp.
description: Realtek Wireless Lan Driver
license: GPL
srcversion: 5E9D12706FAF7E2BB4F284E
alias: usb:v2357p0103d*dc*dsc*dp*ic*isc*ip*in*
alias: usb:v2357p0101d*dc*dsc*dp*ic*isc*ip*in*
alias: usb:v20F4p805Bd*dc*dsc*dp*ic*isc*ip*in*
alias: usb:v2001p3316d*dc*dsc*dp*ic*isc*ip*in*
alias: usb:v2001p3315d*dc*dsc*dp*ic*isc*ip*in*
alias: usb:v07B8p8812d*dc*dsc*dp*ic*isc*ip*in*
alias: usb:v2019pAB30d*dc*dsc*dp*ic*isc*ip*in*
alias: usb:v1740p0100d*dc*dsc*dp*ic*isc*ip*in*
alias: usb:v13B1p003Fd*dc*dsc*dp*ic*isc*ip*in*
alias: usb:v1058p0632d*dc*dsc*dp*ic*isc*ip*in*
alias: usb:v2001p3313d*dc*dsc*dp*ic*isc*ip*in*
alias: usb:v0586p3426d*dc*dsc*dp*ic*isc*ip*in*
alias: usb:v0E66p0022d*dc*dsc*dp*ic*isc*ip*in*
alias: usb:v0B05p17D2d*dc*dsc*dp*ic*isc*ip*in*
alias: usb:v0409p0408d*dc*dsc*dp*ic*isc*ip*in*
alias: usb:v0789p016Ed*dc*dsc*dp*ic*isc*ip*in*
alias: usb:v04BBp0952d*dc*dsc*dp*ic*isc*ip*in*
alias: usb:v0DF6p0074d*dc*dsc*dp*ic*isc*ip*in*
alias: usb:v7392pA822d*dc*dsc*dp*ic*isc*ip*in*
alias: usb:v2001p330Ed*dc*dsc*dp*ic*isc*ip*in*
alias: usb:v050Dp1106d*dc*dsc*dp*ic*isc*ip*in*
alias: usb:v0BDAp881Cd*dc*dsc*dp*ic*isc*ip*in*
alias: usb:v0BDAp881Bd*dc*dsc*dp*ic*isc*ip*in*
alias: usb:v0BDAp881Ad*dc*dsc*dp*ic*isc*ip*in*
alias: usb:v0BDAp8812d*dc*dsc*dp*ic*isc*ip*in*
depends:
vermagic: 4.4.0-101-generic SMP mod_unload modversions
parm: rtw_ips_mode:The default IPS mode (int)
parm: rtw_usb_rxagg_mode:int
parm: rtw_qos_opt_enable:int
parm: ifname:The default name to allocate for first interface (charp)
parm: if2name:The default name to allocate for second interface (charp)
parm: rtw_initmac:charp
parm: rtw_channel_plan:int
parm: rtw_special_rf_path:int
parm: rtw_chip_version:int
parm: rtw_rfintfs:int
parm: rtw_lbkmode:int
parm: rtw_network_mode:int
parm: rtw_channel:int
parm: rtw_mp_mode:int
parm: rtw_wmm_enable:int
parm: rtw_vrtl_carrier_sense:int
parm: rtw_vcs_type:int
parm: rtw_busy_thresh:int
parm: rtw_ht_enable:int
parm: rtw_bw_mode:int
parm: rtw_ampdu_enable:int
parm: rtw_rx_stbc:int
parm: rtw_ampdu_amsdu:int
parm: rtw_vht_enable:int
parm: rtw_lowrate_two_xmit:int
parm: rtw_rf_config:int
parm: rtw_power_mgnt:int
parm: rtw_smart_ps:int
parm: rtw_low_power:int
parm: rtw_wifi_spec:int
parm: rtw_antdiv_cfg:int
parm: rtw_antdiv_type:int
parm: rtw_enusbss:int
parm: rtw_hwpdn_mode:int
parm: rtw_hwpwrp_detect:int
parm: rtw_hw_wps_pbc:int
parm: rtw_max_roaming_times:The max roa...

[Jeremy (wa113y3s)]

The filename doesn't match the vermagic
filename: /lib/modules/4.4.0-104-generic/updates/dkms/8812au.ko
vermagic: 4.4.0-101-generic SMP mod_unload modversions

It was built against the older kernel headers

[[e-mail] (andrea.iacoponigmail.com)]

I see.
Because of that I did reinstaller the driver, letting the driver rebuilding.

The new situation is:
uname -a: Linux ubabbu16 4.4.0-109-generic #132-Ubuntu SMP Tue Jan 9 19:52:39 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
dkms status: rtl8812au, 4.3.8.12175.20140902+dfsg, 4.4.0-109-generic, x86_64: installed
modinfo 8812au: vermagic: 4.4.0-109-generic SMP mod_unload modversions

However: driver do not load (i.e is not listed in lsmod). I can issue modprobe 8812au and load the driver, but it is useless (i.e. is not used).

Any help will be very appreciated, because I have a limited knowledge about mods and drivers.

[Reinhard Koehn (rekoehn)]

This seems to be a duplicate of bug 1705820 and bug 1804832

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.