TouchBar sliders unresponsive after monitor connected

Originator:anthony
Number:rdar://29855771 Date Originated:04-Jan-2017
Status:Open Resolved:No
Product:macOS + SDK Product Version:macOS Sierra 10.12.2
Classification: Reproducible:Always
 
Area:
Something not on this list

Summary:
After connecting an external monitor the TouchBar volume and brightness sliders no longer appear when tapping their respective buttons. The buttons still show their pressed state (light background) when pressed, however no slider shows and the existing controls (both system controls and app controls) stay shown.

A restart is required to get normal behaviour back, disconnecting the monitor is not enough.

Steps to Reproduce:
1. Connect an external monitor
2. Press the volume or brightness slider buttons on the TouchBar

Expected Results:
All system and app controls to hide and the slider to show.

Actual Results:
System and app controls stay exactly as they are and the slider does not show.

Version:
macOS Sierra 10.12.2

Notes:


Configuration:
MacBook Pro (15-inch, 2016)
2.7 GHz Intel Core i7
16GB 2133 MHz LPDDR3
Radeon Pro 455 2048 MB
macOS Sierra 10.12.2

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