Upgrade path for Clockwork OS v0.2

I have two questions about HDMI connection.
The questioner’s environment is as follows.

  • ClockworkPI (CPI v3.1) development board
  • OS Image v0.2

Q1) No audio output
There is no sound when connecting to HDMI.
Does anyone know the solution?

Q2) RetroArch’s behavior is very slow
RetroArch’s behavior is very slow when connecting to HDMI.
The cursor movement of MainMenu is also slow.
Below is the VIDEO setting I tried.

<1> Very slow operation
Start in Fullscreen Mode ON
Windowed Fullscreen Mode OFF

<2> It is faster than <1>, but it still works slowly
Start in Fullscreen Mode OFF
Windowed Fullscreen Mode ON
Windowed Scale 2.0x

<3> Smooth operation
Start in Fullscreen Mode OFF
Windowed Fullscreen Mode ON
Windowed Scale 1.0x

How can I make it work smoothly with “full screen” or “Windowed Scale 2.0x”?

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