WiFi not working on Samsung Galaxy S3: "WifiStateMachine( 2240): Failed to load driver"

**Problem description:** I have a WLAN problem with my Samsung Galaxy S3 (GT-I930). I cannot activate WiFi. Logcat shows me that the driver could not be loaded (detailed WiFi logging has been activated via the developer options):

D/WifiService( 2240): setWifiEnabled: true pid=3142, uid=1000

E/WifiService( 2240): Invoking mWifiStateMachine.setWifiEnabled

E/WifiStateMachine( 2240):  InitialState !CMD_START_SUPPLICANT 0 0

E/WifiStateMachine( 2240): Failed to load driver

The netcfg command does not list any wlan0 interface:

lo       UP     127.0.0.1/8   0x00000049 00:00:00:00:00:00
sit0     DOWN     0.0.0.0/0   0x00000080 00:00:00:00:00:00
ip6tnl0  DOWN       0.0.0/0   0x00000080 00:00:00:00:00:00
rmnet0   DOWN       0.0.0/0   0x00001090 00:00:00:00:00:00
rmnet1   DOWN       0.0.0/0   0x00001090 00:00:00:00:00:00
rmnet2   DOWN       0.0.0/0   0x00001090 00:00:00:00:00:00

In the WLAN advanced settings, there is no MAC address available. The WiFistatus that can be reached via the **#*#*4636#*#*** service code on the phone number pad lists the following information: Wi-Fi state: Disabled
Network state:
Supplicant state: UNINITIALIZED
RSSI: -127
BSSID:
SSID:
Hidden SSID: false
IPaddr: 0.0.0.0
MAC addr:
Network ID: -1
Link speed: -1 Mbps
Scan results:
**Android version:** The phone is rooted, ClockworkMod Recovery (CWM) is installed. I tried different custom ROMs (see next point "history"). The current Android version is 5.0.2 (ROM: Liquid Smooth Lollipop, Kernel-Version: 3.0.31-CM-gdd7ad6a) **History** At first, I rooted my phone and flashed **Cyanogenmod 10.2 cm-10.2.0-i9300** (Stable Version, Android 4.3)). Everything worked fine (including WiFi) and I was pleased with the smoothness and beauty of the Cyanogenmod. Out of curiosity, I tried a **Cyanogenmod cm-11-20150614-NIGHTLY-i9300** (Android 4.4) and faced the problem the first time. After returning from airplane mode, the WiFi was broken. I assumed the nightly build to be still buggy and reflashed the Cyanogenmod 10.2. However, I was not able to get the WiFi back. After that, I returned to a **stock ROM** but no luck. The WiFi was still dead. I started to consider that it might be a hardware issue and got a **new WLAN antenna as well as a new WLAN-speaker-thingy**. I changed the parts and tried again with Cyanogenmod 10.2. Guess what, the WiFi was working again. But unfortunately not very long. I am not quite sure but I assume the WiFi went away again after returning from airplane mode. Well, I then tried two other custom ROMs: **SlimKat 4.4. Slim-i9300-4.4.4.build.9.0-OFFICIAL-8312** and **Liquid Smooth Lollipop (5.0.2)** which is still on the phone. **On Liquid Smooth, I was able to get the WiFi back a couple of times** (meaning I could see local networks in range and even connect to one of them) but never really long and in the end, it died again forever. I am really confused about the question: Is it a software or a hardware issue? I sent the WLAN speaker module back to the merchant and tried another one but was not able to revive the WLAN since then. **Other things I tried** I tried some WLAN fixer apps (without success): - Wifi Fixer - Blade Wifi Fix - FXR WiFi fix and rescue 1.5.0 I tried some useless stuff with the wpa_supplicant.conf file that I have read about in another forum. In addition to that, I also did googling and I think I got through the whole first page of search results for a lot of search terms. **Logcats** I pasted the detailed logcats in Pastebin: - Liquid Smooth boot on the day WLAN was working for a short period of time: https://pastebin.com/dT9Ucbs5 - Liquid Smooth successful WLAN activating (search for "banana" that is the SSID I connected with): https://pastebin.com/yQsgkQiV - Liquid Smooth boot and failed WLAN activation (freshest log): https://pastebin.com/ikDr9vJi - The dmesg output: https://pastebin.com/0caXAPAd . There is a message: "failed to power up DHD generic adapter" **I would really appreciate any kind of help or advice. What can I still try? What could be the cause of the problem? Anything I have overlooked?**