Ubuntu w/ LG 5k2K monitor glitches and artifacts

Framework Laptop 13 Linux
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  • Which OS (Operating System)?

    ❯ lsb_release -a
No LSB modules are available.
Distributor ID:	Ubuntu
Description:	Ubuntu 25.04
Release:	25.04
Codename:	plucky

  • Which Framework product (Laptop 13, Laptop 16, Laptop 12 or Desktop) and which generation (Intel 11th gen, Intel 12th gen , Intel 13th gen, Chromebook, AMD 7040 Series, AMD AI 300 Series, AMD Ai Max 300 Series)

    13", AMD 7040

Anyone else tried plugging HDMI into the new LG 5k2k monitor?

The lil’laptop seems to struggle to keep a steady output (my nvidia desktop handles it just fine).

Other information that may be useful

❯ uname -r
6.14.0-23-generic

Another thing I noticed was the the laptop didn’t detect the max resoultion. It only went up to 4k.

I was looking at AMD’s website, and they say that the CPU can go up to 8k (at lower refresh rate), so… maybe it’s a linux/kernel/driver issue?

How do I debug this sort of thing?

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I’m pretty sure this was an issue with the HDMI module / port I have.

I bought a USB-C to HDMI adapter, and things work fine now.

So I suppose the HDMI module I got with my laptop is either too old or just doesn’t support the resolution for the monitor

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