## System details

AMD Ryzen 7 8845HS with Radeon 780M Graphics (amdgpu), LG UltraGear evo 27GM950B-B connected via DisplayPort (DP-1), Omarchy 4.0.1-1, Hyprland 0.56.2, Linux 7.1.9-arch1-2, ddcutil 2.2.7.

Diagnostic log: https://logs.omarchy.org/6F0h7h

## What's wrong?

The Display panel detects the external monitor and shows a brightness slider, but dragging the slider does not change the monitor's brightness. The panel also reports success because the underlying helper exits successfully, although the monitor's VCP brightness value remains unchanged.

This is reproducible with the packaged DDC helper:

```text
$ ddcutil --bus 9 getvcp 10 --brief
VCP 10 C 100 100

$ omarchy-brightness-display --no-osd --monitor DP-1 70%
$ echo $?
0

$ ddcutil --bus 9 getvcp 10 --brief
VCP 10 C 100 100
```

The same monitor responds correctly when the DDC checks are not skipped:

```text
$ ddcutil --bus 9 setvcp 10 70
$ ddcutil --bus 9 getvcp 10 --brief
VCP 10 C 70 100
```

The fast path used by Omarchy reproduces the failure:

```text
$ ddcutil --bus 9 --skip-ddc-checks --noverify setvcp 10 70
$ ddcutil --bus 9 getvcp 10 --brief
VCP 10 C 100 100
```

The packaged helper `/usr/share/omarchy/bin/omarchy-brightness-display-ddc` currently invokes:

```bash
ddcutil --bus "$bus" --skip-ddc-checks --noverify setvcp 10 "$raw_target"
```

It appears that this monitor accepts the command without an error but ignores the write when `--skip-ddc-checks` is used. The normal `ddcutil` path successfully changes VCP 0x10. A possible fix would be to retry without `--skip-ddc-checks` when the requested value is not applied, or otherwise allow a per-monitor fallback.

The monitor is identified by `ddcutil` as LG ULTRAGEAR+, product code 23800, serial 605NTUWKV886, on I2C bus 9; VCP 0x10 is reported as writable with a range of 0–100.

Expected: dragging the Display panel brightness slider changes the physical monitor brightness.

Actual: the slider moves in the UI, but the physical brightness remains unchanged.