Can I use both the HDMI and DisplayPort outputs simultaneously?
Yes, the docking station supports simultaneous video output through both HDMI and DisplayPort ports, provided the screen resolution does not exceed 2560 x 1600. If the resolution exceeds 2560 x 1600, only one display can be used at a time. (Page 12)
From the official HP Laserjet Pro Mfp M426fdw manual, page 12
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