In same time I was consulting my issue with Unitek support. They are telling that their docking station on DisplayLink chipset is not supporting 21:9 resolutions.
Quote:
I am afraid that HDMI port of Y-3704 doesn't support resolution 2560x1080 at display 21:9, cause display ratio 21:9 was not available when Y-3704 was released over 7 years ago and the chipset solution didn't take it into account.
When we produce this product, there is not 21:9 screen product. So it is not suitable for your screen.
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However they are giving my table with max resolutions for DL-3700 where are:
16:9 - 2560x1440
16:9 - 1960x1080
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so even when both resolutions from above. are supported, then is no possibility to run 2560x1080 ?