I tried changing the value of the speaker volume in snd_soc_msm_2x, but after saving it, a large part of the file disappeared, and after my battery reached zero and my phone died, it was stuck in a bootloop when I tried to turn it on again.
So, I flashed CM11 again, everything works fine but there are 2 missing features at the moment.
1. The home button and multitask buttons don't do anything anymore, they still light up and vibrate though.
2. I have a pin code to unlock my phone, but it only asks for my pin code when I turn it on the first time. When I lock my phone and unlock it, it doesn't ask for a pincode.
Maybe there are even more problems but this is just what I noticed until now.
Tried wiping cache and dalvik, didn't help.