[Bug] Blocky / pixelated backdrop blur in Control Center and UI layers

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Assessment

Research direction

Description

Send logs report ID

NM-NO

Environment

OS: macOS 15.8.1 (Build 24H32)
Driver Version: 2.5.3 (NVAccel / NVRMFB / NVRMAGDC)
CPU: AMD Ryzen 7 3800X
GPU: NVIDIA GeForce RTX 3080 10GB (Device ID: 10DE:2206)
Boot-args: keepsyms=1 debug.nvrmfb_flip_latch=2 (tested with and without -nvkmsnosmooth)

What happens

Noticed visual corruption on UI surfaces that use backdrop blur (most obvious in Control Center, spotlight and menu drop-downs).

Instead of a smooth Gaussian blur gradient, the background breaks down into large pixelated blocks / coarse dithering tiles. Looks like an issue with texture downsampling or improper filter pass in CABackdropLayer when resolving through NVMTL.

Reproduces consistently on desktop:

1. Open Control Center from the menu bar.
2. The background behind the modules (Wi-Fi, Bluetooth, sound/display sliders) renders as a chunky pixel grid instead of smooth glass blur.

Written by you

• I wrote this report myself. AI-written issues are closed without review (see CONTRIBUTING.md).

App or game (if it is one)

No response

Did you change anything yourself?

No response

Getting set up

First steps

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2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
3. Fork the repository and make your change on a branch.
4. Open a pull request that references the issue number.

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