Yes quite a few people have reported similar problems this year with
Ubuntu's newer kernels. But I don't recall any of them being proven to
be obvious software bugs. Just a more conservative bandwidth
calculation, usually solved with a new cable.
If you want to go to maximum quality, I recommend the Apple Thunderbolt
4 Pro cables to avoid such issues. But that's a lot of money so probably
the option of last resort.
We do have a software option that might help too. In
~/.config/monitors.xml you can add maxbpc:
<monitor>
...
<maxbpc>8</maxbpc>
</monitor>
Choose 8 or 6 and then log in again. That should reduce the bandwidth
requirements, which might be enough.
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https://bugs.launchpad.net/bugs/2077766
Title:
[i915] Dell Ultrasharp 4919DW only achieves half of native resolution
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