Wifi stopped working. Not even manually.

Hi,
I've no idea, where to go from here. Wifi on my Thinkpad Edge 13 Laptop stopped working (meanwhile a few weeks ago). Until then I had it running with NetworkManager and everything was fine. At home it is a WPA-connection. Still works without problems on mobile and kids' laptop (ubuntu). "iw wlan0 scan" shows hardly any networks although there're loads around. That used to be different before. At work, an EAP-connection works well under NetworkManager. Now I removed NetworkManager in order to try manual connection.
When I start wpa_supplicant, I get "device or resource busy" and the connection fails. My conf-file consits only of the output of wpa_passphrase. The corresponding dmesg shows several
[ 1838.093841] wlan0: authenticate with 00:24:d1:79:a7:7d
[ 1838.103460] wlan0: direct probe to 00:24:d1:79:a7:7d (try 1/3)
[ 1838.206524] wlan0: direct probe to 00:24:d1:79:a7:7d (try 2/3)
[ 1843.108643] wlan0: deauthenticating from 00:24:d1:79:a7:7d by local choice (reason=3)
After this, the interface comes down by itself. The output of dmesg is the same with NetworkManager. I've also tried wicd and netctl without success. I have ABSOLUTELY no idea how to continue debugging and appreciate any comment that might give me a new direction.
Question on the side: when I reinstall NetworkManager and enable it under systemd, do I have to enable dhcpcd under systemd as well or is that taken care of by NetworkManager?

Thank you for helping me out. When I tried again today I couldn't even get my interface up due to RF-kill. Installed rfkill (was there before when I tried wicd) and removed the soft block on phy0. Now these are the services running:
$ sudo systemctl -t service
UNIT LOAD ACTIVE SUB DESCRIPTION
avahi-daemon.service loaded active running Avahi mDNS/DNS-SD Stack
cronie.service loaded active running Periodic Command Scheduler
dbus.service loaded active running D-Bus System Message Bus
[email protected] loaded active running Getty on tty1
polkit.service loaded active running Authorization Manager
slim.service loaded active running SLiM Simple Login Manager
systemd-journald.service loaded active running Journal Service
systemd-logind.service loaded active running Login Service
systemd-modules-load.service loaded active exited Load Kernel Modules
systemd-remount-fs.service loaded active exited Remount Root and Kernel File
systemd-sysctl.service loaded active exited Apply Kernel Variables
systemd-t...es-setup.service loaded active exited Recreate Volatile Files and D
systemd-udev-trigger.service loaded active exited udev Coldplug all Devices
systemd-udevd.service loaded active running udev Kernel Device Manager
systemd-update-utmp.service loaded active exited Update UTMP about System Rebo
systemd-u...sessions.service loaded active exited Permit User Sessions
systemd-v...le-setup.service loaded active exited Setup Virtual Console
udisks2.service loaded active running Disk Manager
upower.service loaded active running Daemon for power management
Nothing network as far as I can tell. Then I get wlan0 up with "sudo ip link set". Starting wpa_supplicant I get this output (as before):
Successfully initialized wpa_supplicant
wlan0: Trying to associate with 00:24:d1:79:a7:7d (SSID='UPC009875' freq=2412 MHz)
ioctl[SIOCSIWFREQ]: Device or resource busy
wlan0: Association request to the driver failed
wlan0: Authentication with 00:24:d1:79:a7:7d timed out.
wlan0: CTRL-EVENT-DISCONNECTED bssid=00:24:d1:79:a7:7d reason=3 locally_generated=1
After I quit with Ctrl-C the interface is down again...
Looks like the ioctl... is coming in my way, I'll try to figure out what that is.

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What do I do when WiFi stops working?

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