Mark141
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TB16 constant flicker at 60hz (XPS13 & 4K Dell P2715Q)

I'm using a TB16 with a XP13 (9350) and a single 4K monitor (Dell P2715Q). The setup works perfectly at 30Hz but at 60Hz it flickers continually. By flicker I mean the external display switches to black for 2 to 3 seconds several times per minute. The BIOS of the XPS13 and all drivers are current. MST is turned off on the monitor. The setup works fine at 30Hz. I tried enabling airplane mode as others suggested in this forum and it made no difference. I have also tried several DisplayPort (mini and full) cables with no success. 

This is not an issue with the monitor as I can hookup a Surface Pro 4 at 60Hz without any issues. 

One interesting thing is when I hookup the SurfacePro4 it defaults to 60Hz but when I hookup the XPS via the TB16 the default refresh rate is 30Hz and I need to change it to 60Hz using the display adapter settings.

Is anyone successfully using a similar setup without flicker? The TB16 specs list it as capable of supporting 2 4K monitors at 60Hz.

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