Same problem here. Asus Laptop UX305fa. Half-speed sound when connected via 3.5 
mm to external monitor conntected via HDMI.
For me this started happening after upgrading from 15.10 to 16.04. I can get 
around the issue by rebooting my machine after connecting the external 
monitor... which ofc isn't a solution, just an ugly workaround for now.

cat /proc/asound/cards
 0 [HDMI           ]: HDA-Intel - HDA Intel HDMI
                      HDA Intel HDMI at 0xf711c000 irq 50
 1 [PCH            ]: HDA-Intel - HDA Intel PCH
                      HDA Intel PCH at 0xf7118000 irq 47

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https://bugs.launchpad.net/bugs/1580882

Title:
  [, Intel Broadwell HDMI, Digital Out, HDMI] Sound like half speed

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