LT1423P (wireless) - Conneting but fails to connect

I've yet to have a stable connection my LT1423P for over a month now. I raised a support case about not being able to connect to it via 5Ghz and was sent a replacement. when I tried that one it also didn't connect at 5Ghz. Since then, I can't connect at all via wireless!!
I just get Connecting... in the Lenovo control panel, the LT1423P connects, displays the screen (but not touch sensitive), then after about 10 to 15 seconds it disconnects, then reconnects, then disconnects etc.. for a few times, then no connection.
It works fine when connected via USB though, and it worked before I tried connecting via 5Ghz.
I've tried uninstalling everything and re-installing but still no luck (everything = Lenovo control panel, displaylink, RTLink wifi drivers) - I've even gone into device manager, shown hidden devices and deleted the ones that appear to be to do with Lenovo or RTLink.
Any ideas on how I can sanitise my system of all the Lenovo software (files, devices, drivers, registry etc..) so I can start again? and before you suggest - NO, I'm not rebuilding or reinstalling or repairing my Windows 8.1 as there is far too much on it and I don't have the time to do that.
Many thanks

I got the problem too.
This comes from the fact the the monitor does not support recent DisplayLink drivers in wireless mode.
To use it in wireless mode, you have to stick with displaylink driver version 7.4 M4, and not above as far as I can tell.

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$ lspci -vv
03:00.0 Network controller: Intel Corporation Centrino Ultimate-N 6300 (rev 35)
Subsystem: Intel Corporation Centrino Ultimate-N 6300 3x3 AGN
Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
Latency: 0, Cache Line Size: 64 bytes
Interrupt: pin A routed to IRQ 35
Region 0: Memory at d5300000 (64-bit, non-prefetchable) [size=8K]
Capabilities: <access denied>
Kernel driver in use: iwlwifi
$ sudo systemctl status NetworkManager-wait-online.service
● NetworkManager-wait-online.service - Network Manager Wait Online
Loaded: loaded (/usr/lib/systemd/system/NetworkManager-wait-online.service; enabled; vendor preset: disabled)
Active: failed (Result: exit-code) since Sun 2014-12-21 22:58:55 EST; 12min ago
Main PID: 500 (code=exited, status=1/FAILURE)
Dec 21 22:58:55 Defiant systemd[1]: NetworkManager-wait-online.service: main process exited, code=exited, status=1/FAILURE
Dec 21 22:58:55 Defiant systemd[1]: Failed to start Network Manager Wait Online.
Dec 21 22:58:55 Defiant systemd[1]: Unit NetworkManager-wait-online.service entered failed state.
Dec 21 22:58:55 Defiant systemd[1]: NetworkManager-wait-online.service failed.
$ sudo systemctl status NetworkManager-dispatcher.service
● NetworkManager-dispatcher.service - Network Manager Script Dispatcher Service
Loaded: loaded (/usr/lib/systemd/system/NetworkManager-dispatcher.service; enabled; vendor preset: disabled)
Active: inactive (dead)
$ sudo systemctl status NetworkManager.service
● NetworkManager.service - Network Manager
Loaded: loaded (/usr/lib/systemd/system/NetworkManager.service; enabled; vendor preset: disabled)
Active: active (running) since Sun 2014-12-21 22:58:23 EST; 13min ago
Main PID: 341 (NetworkManager)
CGroup: /system.slice/NetworkManager.service
└─341 /usr/bin/NetworkManager --no-daemon
Dec 21 23:10:12 Defiant NetworkManager[341]: <info> Activation (wlp3s0) Stage 4 of 5 (IPv6 Configure Timeout) started...
Dec 21 23:10:12 Defiant NetworkManager[341]: <info> (wlp3s0): device state change: ip-config -> failed (reason 'ip-config-unavailable') [70 120 5]
Dec 21 23:10:12 Defiant NetworkManager[341]: <info> Disabling autoconnect for connection 'Bifröst'.
Dec 21 23:10:12 Defiant NetworkManager[341]: <warn> Activation (wlp3s0) failed for connection 'Bifröst'
Dec 21 23:10:12 Defiant NetworkManager[341]: <info> Activation (wlp3s0) Stage 4 of 5 (IPv6 Configure Timeout) complete.
Dec 21 23:10:12 Defiant NetworkManager[341]: <info> (wlp3s0): device state change: failed -> disconnected (reason 'none') [120 30 0]
Dec 21 23:10:12 Defiant NetworkManager[341]: <info> (wlp3s0): deactivating device (reason 'none') [0]
Dec 21 23:10:12 Defiant NetworkManager[341]: <warn> Connection disconnected (reason -3)
Dec 21 23:10:12 Defiant NetworkManager[341]: <info> (wlp3s0): supplicant interface state: completed -> disconnected
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Additionally, after stopping NetworkManager and trying wifi-menu, it scans correctly but fails to connect, never even prompting for a passphrase.
So I tried wpa_supplicant on its own:
$ sudo wpa_supplicant -B -i wlp3s0 -c <(wpa_passphrase "Bifr\xc3\xb6st" "mypassword")
Successfully initialized wpa_supplicant
wlp3s0: failed to initialize driver interface
For good measure:
$ rfkill list
0: tpacpi_bluetooth_sw: Bluetooth
Soft blocked: no
Hard blocked: no
1: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
2: hci0: Bluetooth
Soft blocked: no
Hard blocked: no
$ ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: enp0s25: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
link/ether f0:de:f1:62:13:b8 brd ff:ff:ff:ff:ff:ff
inet 10.0.0.11/24 brd 10.0.0.255 scope global enp0s25
valid_lft forever preferred_lft forever
3: wlp3s0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN group default qlen 1000
link/ether 00:24:d7:c6:ab:48 brd ff:ff:ff:ff:ff:ff
I'm at a loss. and I've googled my little heart out. Any help would be appreciated.

Welcome to the forums - and thanks for a great initial post, all the needed information seems to be here.
Specifically, the following error from wpa_supplicant will most likely be best to dig into:
wlp3s0: failed to initialize driver interface
I see several results of this error in a google search, but none of them quickly translated into solutions yet. To get some more information on it, could you run the same wpa_supplicant command, but with the verbose debugging flag "-dd" and post the ouput here?
I don't have a intel wireless card, so I don't know what the diagnostic signs are for the problem addressed in the wiki, but you may want to try the modprobe options shown in this section of the wiki.
EDIT: there is a similar but unresolved thread on these forums here which points to using the -D flag for wpa_supplicant to specify other drivers. I was thinking this too upon my first reading, but I don't fully understand what these are so I was reluctant to suggest it. It certainly can't hurt anything to use the command in the wiki to see which drivers are available, then try each one.
EDIT 2: and this thread seems to indicate that the -D flag driver specification is the right solution. So start here with the -D flag and only if that fails follow up with my initial debugging suggestions.
Last edited by Trilby (2014-12-22 12:52:13)

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Dia duit!
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Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation. All rights reserved.
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C:\Users\(user name removed)>

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LT1423P (wireless) - Conneting but fails to connect

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