OSX 10.10.5 Yosemite, VLC 2.2.3 Weatherwax (Intel 64-bit), MacBook Pro Retina (Early 2015), native audio (built-in speakers, native audio and video drivers, etc.).
More information about this bug can be found in my post on the old topic page (@ajmas I apologize for not knowing the rules about reviving old threads—this bug seems to have been around for awhile, and I didn't want to start a 4th or 5th separate forum topic on this same bug, so I chose the thread that seemed to have the most extensive information on the bug instead of the most recent).
But for convenience, I'll copy over my use case / instructions to reproduce below:
Observed behavior:
1) Construct playlist in VLC
2) Start playing music
3) Start working out in my room while listening to music
...5 minutes elapse...
4) Computer switches into Energy Saving mode, screen dims
5) Song currently playing will finish
6) VLC switches to next song, but no audio is heard
...1 minute elapses...
7) Frustrated that workout is interrupted, walk over to computer and touch trackpad
Computer screen comes back on, audio returns, song is at 1:00 mark (this tells me that the process is active and the computer has been prevented from entering sleep mode, but for some reason the audio is not outputted)
Desired behavior:
1) Construct playlist in VLC
2) Start playing music
3) Start working out in my room while listening to music
4) Finish 30-minute workout with uninterrupted audio