Actually the problem might just be that the Linux kernel doesn't
understand extended vendor-specific display timings. I've decoded your
monitor's EDID and it reveals that 3840x2160 30Hz is mentioned:
edid-decode (hex):
00 ff ff ff ff ff ff 00 04 69 a3 28 24 51 00 00
0e 1b 01 03 80 3e 22 78 3a
Thanks. The file xrandr.txt indeed shows the HDMI connection is limited
to 1920x1080. It also shows that's the "current" mode but it lists no
"preferred" mode, which does support the idea that the monitor can do
higher resolution...
The manufacturer's specs mention that 4K is limited to 30Hz over
Done. Thanks
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https://bugs.launchpad.net/bugs/1890418
Title:
External monitor will not display to 4k
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** Attachment added: "journal.txt"
https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/1890418/+attachment/5399092/+files/journal.txt
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** Attachment added: "lspcik.txt"
https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/1890418/+attachment/5399093/+files/lspcik.txt
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** Attachment added: "xrandr.txt"
https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/1890418/+attachment/5399094/+files/xrandr.txt
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Please run this command to attach more information about the system:
apport-collect 1890418
Please also run these commands:
lspci -k > lspcik.txt
journalctl -b0 > journal.txt
xrandr --verbose > xrandr.txt
and attach the resulting text files here.
** Tags added: focal
** Changed in:
