That's odd because 3440x1440 actually has lower bandwidth requirements
(fewer pixels) than 3840x2160. Still, to go above 60Hz you will need
both your HDMI cable and your graphics card to be capable of HDMI 2.1,
not just 2.0.
Please tell us the model of graphics card you are using. If you're just
using the integrated graphics of the Intel i7--1255U chip then I'm not
sure that can do it with HDMI. DisplayPort looks more certain to work
(you may need a USB-C to DisplayPort cable for that).
Please also run this so we can see the modes that the kernel driver
believes are possible:
sudo apt install drm-info
drm_info > drminfo.txt
and attach the resulting text file here.
** Changed in: mutter (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/2046798
Title:
Ubuntu Wayland does not support 21:9 monitor
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