Merge remote-tracking branch 'gavspav/master'

Author: Martin Schuhfuss

README.md

@@ -125,4 +125,17 @@ A short checklist of what you will need:
 You can buy everything at [adafruit.com](https://adafruit.com),
 [sparkfun](https://sparkfun.com), on ebay or your favourite electronics
 retailer (germany: check [conrad electronic](http://www.conrad.de)
-or [watterott](http://watterott.com) where i bought most of my stuff).
+or [watterott](http://watterott.com) where i bought most of my stuff).
+
+## Known Issues
+
+There is a conflict where the internal soundcard uses the same 
+GPIO / DMA / PWM functions that are needed to run the LED-drivers. 
+As far as I know you can not use both at the same time.
+
+One workaround is to use an external (USB) soundcard and make it the 
+default device:
+
+Edit /etc/modprobe.d/alsa-base.conf and comment out the line 
+options snd-usb-audio index=-2
+If anyone finds a better solution please get in touch!