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Could you please provide me with your system configuration?
Intel® Graphics Driver Report:
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Please see if the information at the following link can help you.
cacciu, the report would have given you the information that ivanu_intel requested. However make sure you install the latest video drivers. Windows 10 would have overwritten the drivers with the MS certified one.
Also, I have the LG ultra wide which are 21:9 as well. HDMI does not support 2560x1080. To get that resolution you need DVI-D or DisplayPort, and if you use an adapter make sure the adapter can support the resolution. Your monitor manual will tell you which ports support 2560x1080 since not all ports do support it.
After you know if you can connect using that resolution from the monitor point, then you might have a limitation in the graphics power of the embedded GPU. I am not sure it can support it.
I would try it here, but I don't have any locally with me and the only stick that I have running right now it is running Linux.
I am waiting on 2 more I ordered yesterday, so once I receive them I can try them out. But I am pretty sure the LG UM29 does not support 2560x1080 on HDMI, so I am using mine with DVI-D (my cards do not have DisplayPort).
I am also using 21:9 at home, and the monitors are connected using DisplayPort
....Checking HDMI specs, only HDMI version 1.4 would work. Previous versions did not have enough throughput to support over 1920x1200.
The Intel ComputeStick has HDMI 1.4a, but your monitor has to have 1.4 as well. In mine I could not find anything that says it does, but I do know that not even with my video cards at home the HDMI was displaying at full resolution.
If you have another computer that can display at 2560x1080 on that same monitor in HDMI then it works, otherwise it does not.
Also, LG has software for its monitors. Not sure which monitor you are using, but it is a possibility as well