Color Profile of Monitor on Windows 10

Hello,

I bought a Datacolor Spyder Pro in order to calibrate my monitor. I have a laptop with external monitor (a benq BL2420PT). OS is Window 10. First I calibrated the external monitor and then I did the same for the laptop monitor. After the second calibration, reloading darktable I noticed very awful colors in my pictures. In order to get pleasant colors I had to set the profile of the external monitor also for the laptop monitor. the monitors are set in order to show desktop only for external monitor (the laptop monitor is off). Is there some problem in darktable when loading the correct monitor profile ?
thank you

There is known bug (as you noticed it’s using now only profile of first display) in darktable 3, 2.6 was ok.
You can see possible workarounds in discussion here: https://discuss.pixls.us/t/which-profile-is-darktable-using-on-a-windows10-multi-monitor-pc

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thank you!!