I've got a Samsung S34J552 34" especially for using with 3440x1440 resolution but looks like it only work at 2560x1080 with Ubuntu 20.04. I tried o add the 3440x1440 profile using xrandr without success (it goes back to the 2560x1080).

Dell XPS 13 9380 - Inter UHD 620 - Monitor connected with HDMI cable, Linux 5.10.13-051013-generic

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1 Answer

I resolved by using a DVI - USBC cable and it work great!

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