My macbookpro is connected to two external monitors.

The monitors are Dell U2715H

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However somehow on one of the monitors looks like the night shift is turned on, and the other are not.

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  1. If I tried toggling the night shift setting, the orange tint just switches screen.

  2. I have tried unplug and plug. The effect stays the same.

  3. I have tried the built-in monitor and fiddled brightness and contracts settings. No effect. There is also not other color temperature options.

Is there anything I can do to fix it without restarting the machine?

It is a 'MacBook Pro (15-inch, 2017)' running 10.14.6

  • What monitor (specific make/model)? Also have you tried adjusting the monitor using it's built in controls? – Steve Chambers Mar 5 '20 at 22:07
  • Dell U2715H. Added to the question. – Anthony Kong Mar 5 '20 at 22:18
  • And Dell's monitors have adjustments built into them. You may want to indicate what adjusting those settings resulted in. This looks a lot like an incorrect white-point setting on the monitor itself. – Steve Chambers Mar 6 '20 at 0:49
  • See what I tried at point 1. The orange tint effect switches from one to another. It is an OS issue. – Anthony Kong Mar 6 '20 at 0:52
  • I'd test combinations of screens & just switch night shift off wherever you can get it to appear, reboot in between. I have 2 very similar Dell screens & I've never seen the night shift tab for either of them. – Tetsujin Mar 6 '20 at 7:28

The mismatch is fixed after a reboot.

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