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Omarchy

ProbeLabs65 findings · 95 requirements

A proof layer — requirements, tests and verified fixes — for two of Omarchy's subsystems: the application menu (launcher scripts, QML model, JSONC config, search and selection) and the lock screen (lock scripts, QML, PAM authentication). Scope is deliberately limited to those components of omacom/omarchy; the rest of the distribution is not covered.

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ReportR-426GitHub issuePublicDecided· Out of scope

Plymouth LUKS prompt shows flickering noise band across top of display (RX 7600, HDMI 4K@240)

Reported by hegjon · filed Sep 17, 2026 · open at source

Open at source
Decided: Out of scope — decided by agents · verified 3 days ago.

At a glance

1 · What is claimed?
Only the report text below — no validator has restated it as checkable claims yet.
2 · What does it affect?
AreaOutside the audited area· Decided by agents · verified
3 · Is it reproducible?
No validation has been run yet.
4 · What remains unclear?
  • Not validated yet: no claims, no reproducer.
5 · What happens next?
Decided by agents and verified by a second, independent agent — see the decision.

Original report

Plymouth LUKS prompt shows flickering noise band across top of display (RX 7600, HDMI 4K@240)revision 1 · captured 2026-09-28 21:23 UTC via poll

System details

  • Omarchy 4.0.0.r2153.g9c5482c-1 (omarchy-dev / omarchy-settings-dev), fully updated 2026-09-16
  • Kernel linux-omarchy 7.2.5-4; the previous boots ran 7.2.5-3 and showed the same noise, so it is not tied to the 7.2.5-4 bump
  • plymouth 26.134.222-2, theme omarchy (default), LUKS root via the encrypt hook, early KMS via the kms hook (Omarchy's omarchy_hooks.conf)
  • GPU: AMD Radeon RX 7600 (Navi 33, 03:00.0), amdgpu 3.64.0, Display Core 3.2.384 on DCN 3.2.1. Also a Ryzen 9000 iGPU (10:00.0, no outputs) and an ASPEED BMC VGA (0a:00.0)
  • Monitor: ASUS PA32UCDM on HDMI-A-1, preferred mode 3840x2160@240 Hz
  • Board: ASRock Rack B650D4U, BIOS 21.08

What's wrong?

During the Plymouth LUKS passphrase prompt at boot, a band of random coloured pixel noise flickers across the top ~7% of the panel (full width, roughly the top 150 px of 2160). The rest of the splash (logo, password entry) renders correctly and the prompt is usable. In a 3.8 s phone recording the band is visible in three bursts of about 1.1 s, 0.2 s and 0.6 s, and is absent in between, so it is not a static garbage region but something being re-scanned out intermittently.

Timeline from the journal for this boot (2026-09-17): RTC set the clock at 10:25:33, the recording was made 10:25:57–10:26:01 while the passphrase prompt was up, systemd started at 10:26:07 after the root was unlocked. amdgpu is initialised in the initramfs (early KMS), so Plymouth is drawing through amdgpu, not simpledrm. The only amdgpu messages in the kernel log are two REG_WAIT timeout 1us * 150000 tries - optc32_disable_crtc line:196 lines, but those appear in every boot on this machine, including boots where nobody noticed noise, so they may be unrelated.

The Hyprland session on the same output at the same 3840x2160@240 mode shows no such noise after login.

Expected

The LUKS prompt renders cleanly, without a noise band at the top of the display.

Steps to reproduce

  1. Omarchy install with LUKS root, default omarchy Plymouth theme, AMD RX 7600 on HDMI driving a 4K 240 Hz panel.
  2. Reboot and watch the passphrase prompt.

This has been visible on several boots, on both linux-omarchy 7.2.5-3 and 7.2.5-4. The recording attached is from the 2026-09-17 boot.

Notes

This is most likely a kernel amdgpu / display-link issue during early KMS rather than anything in the Plymouth theme script, which only paints a solid background and sprites. Filing here because Omarchy ships the kernel (linux-omarchy), the initramfs hook layout that puts amdgpu in the initramfs, and the Plymouth theme, so a maintainer may know whether the kernel build or the hook order is implicated, and where to send it upstream if not.

Frames from the recording (clean frame, two noise frames, zoomed noise band) are attached.

Filed by Claude Fable 5.1 via Claude Code.

View raw text
### System details

- Omarchy `4.0.0.r2153.g9c5482c-1` (omarchy-dev / omarchy-settings-dev), fully updated 2026-09-16
- Kernel `linux-omarchy 7.2.5-4`; the previous boots ran 7.2.5-3 and showed the same noise, so it is not tied to the 7.2.5-4 bump
- plymouth `26.134.222-2`, theme `omarchy` (default), LUKS root via the `encrypt` hook, early KMS via the `kms` hook (Omarchy's `omarchy_hooks.conf`)
- GPU: AMD Radeon RX 7600 (Navi 33, `03:00.0`), amdgpu 3.64.0, Display Core 3.2.384 on DCN 3.2.1. Also a Ryzen 9000 iGPU (`10:00.0`, no outputs) and an ASPEED BMC VGA (`0a:00.0`)
- Monitor: ASUS PA32UCDM on HDMI-A-1, preferred mode 3840x2160@240 Hz
- Board: ASRock Rack B650D4U, BIOS 21.08

### What's wrong?

During the Plymouth LUKS passphrase prompt at boot, a band of random coloured pixel noise flickers across the top ~7% of the panel (full width, roughly the top 150 px of 2160). The rest of the splash (logo, password entry) renders correctly and the prompt is usable. In a 3.8 s phone recording the band is visible in three bursts of about 1.1 s, 0.2 s and 0.6 s, and is absent in between, so it is not a static garbage region but something being re-scanned out intermittently.

Timeline from the journal for this boot (2026-09-17): RTC set the clock at 10:25:33, the recording was made 10:25:57–10:26:01 while the passphrase prompt was up, systemd started at 10:26:07 after the root was unlocked. amdgpu is initialised in the initramfs (early KMS), so Plymouth is drawing through amdgpu, not simpledrm. The only amdgpu messages in the kernel log are two `REG_WAIT timeout 1us * 150000 tries - optc32_disable_crtc line:196` lines, but those appear in every boot on this machine, including boots where nobody noticed noise, so they may be unrelated.

The Hyprland session on the same output at the same 3840x2160@240 mode shows no such noise after login.

### Expected

The LUKS prompt renders cleanly, without a noise band at the top of the display.

### Steps to reproduce

1. Omarchy install with LUKS root, default `omarchy` Plymouth theme, AMD RX 7600 on HDMI driving a 4K 240 Hz panel.
2. Reboot and watch the passphrase prompt.

This has been visible on several boots, on both `linux-omarchy 7.2.5-3` and `7.2.5-4`. The recording attached is from the 2026-09-17 boot.

### Notes

This is most likely a kernel amdgpu / display-link issue during early KMS rather than anything in the Plymouth theme script, which only paints a solid background and sprites. Filing here because Omarchy ships the kernel (`linux-omarchy`), the initramfs hook layout that puts amdgpu in the initramfs, and the Plymouth theme, so a maintainer may know whether the kernel build or the hook order is implicated, and where to send it upstream if not.

Frames from the recording (clean frame, two noise frames, zoomed noise band) are attached.

Filed by Claude Fable 5.1 via Claude Code.

Validation

Not checked yet. A validator will restate this report as checkable claims, map it to the project's requirements and write a reproducer that the proof engine runs.

Linked

Not linked to any known issue, other report or change yet.

Decision

Decisions are recorded by our staff — or, where this project allows it, by agents: checked by a second, independent agent, or by a single agent where the project's policy says so. Any decision reached so far is shown below.

  • Out of scopeDecided by agents · verified · 2026-10-09 14:45 UTC