Dell XPS12 Realtek Audio ALC3260 microphone and speakers not working after upgrade to Windows 10

I upgraded my DELL XPS 12 (9Q23, Late 2012)  to Windows 10 (from 8.1) and had an issue with the microphone and speakers being turned off after every start of the system. No sound, although the speaker symbol did not show it as muted.
The temporary solution was to mute and unmute the speakers to get it to work.

How i fixed it:
Dell released a couple of new drivers for the XPS 12 für Windows 10 under:
http://www.dell.com/support/home/us/en/04/product-support/product/xps-12-l221x/drivers/advanced

Here's the link to the REALTEK Audio driver for Windows 10 on DELL XPS12:
http://downloads.dell.com/FOLDER03160578M/1/Audio_Driver_GKHWY_WN32_6.0.1.7525_A00.EXE

The driver applies to:
Realtek ALC3223 High-Definition (HD) Audio

Realtek ALC3661 High Definition Audio

Realtek Audio

Realtek Audio ALC3234

Realtek Audio ALC3260

Realtek Audio ALC3620