UmbrelOS 1.5 incompatible with Intel Celeron N5105 (iGPU) – HDMI video corruption, downgrade to 1.4.2 required

[engmsilva]

Hello Umbrel team,

I am reporting a hardware compatibility issue with UmbrelOS 1.5.
After upgrading from UmbrelOS 1.4.2 to 1.5, the system becomes unusable due to severe video output corruption over HDMI.

The issue appears to be related to graphics driver / iGPU compatibility.
With UmbrelOS 1.4.2, the same hardware works normally.
A downgrade back to 1.4.2 was required to restore normal operation.

Observed behavior

UmbrelOS 1.5 boots, but the HDMI output is completely corrupted

The screen shows horizontal artifacts and distorted colors

No readable console or UI is visible

Issue happens immediately on boot with UmbrelOS 1.5

Downgrading to UmbrelOS 1.4.2 fully resolves the issue

Expected behavior

Normal HDMI video output, as observed on UmbrelOS 1.4.2

Hardware information

Beelink U59

System
Linux umbrel 6.1.0-34-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.135-1 (2025-04-25) x86_64 GNU/Linux

CPU
Intel(R) Celeron(R) N5105 @ 2.00GHz

Memory
16 GB RAM

Storage
NVMe: Kingston SNV3S2000G (2 TB) SSD : Kingston SA400S37960G (960 GB)

Graphics
Intel integrated GPU (multiple HDMI/DP outputs detected)

Additional notes

This system was fully functional on UmbrelOS 1.4.2

The problem started only after upgrading to UmbrelOS 1.5

This strongly suggests a kernel, DRM, or iGPU driver regression

An image of the corrupted HDMI output on UmbrelOS 1.5 is attached to this issue

Attachment

Please let me know if you need additional logs or testing.

Thank you.