## What happened

Installing Omarchy on a Mac with an Apple T1/T2 chip permanently disables the
Touch Bar, FaceTime camera, Touch ID and ambient light sensor — and nothing in
the installer warns that this will happen.

On these machines the T1/T2 coprocessor loads its firmware from a directory
that macOS maintains **on the EFI System Partition**. When the installer
replaces the partition map and creates a fresh ESP, that firmware is gone. The
coprocessor then falls back to DFU/recovery mode on every boot:

```
usb 1-3: New USB device found, idVendor=05ac, idProduct=1281
usb 1-3: Product: Apple Mobile Device (Recovery Mode)
serial:  CPID:8002 CPRV:10 CPFM:03 SCEP:01 BDID:12 IBFL:3D
```

A healthy T1 enumerates as `05ac:8600` ("iBridge"). Everything behind it dies
with it:

- `/sys/bus/hid/devices/` is empty — no Touch Bar, and **no Esc or function
  keys at all**, since on these models both live in the Touch Bar
- no `/dev/video*`, `uvcvideo` never loads — the FaceTime camera is gone
- Touch ID and the ambient light sensor are gone
- the entire USB tree contains only the DFU device

I had deliberately partitioned the drive beforehand to dual-boot, but the
install overwrote the partition map and took the whole disk anyway.

## Why this is worse than normal data loss

This is not recoverable from Linux. Apple restricts Configurator revive/restore
to T2 and Apple Silicon — [T1 is explicitly excluded](https://support.apple.com/en-us/108900)
("Other Mac models don't apply"), and there is no documented file-level way to
restore T1 firmware. The only fix is **reinstalling macOS**, which for a
single-disk machine means wiping the Omarchy install that just replaced it.

So a user who installs Omarchy on a T1 Mac loses Esc, the function row, and the
webcam, and can only get them back by erasing Omarchy again.

## Expected

The installer should detect Apple hardware with a T1/T2 coprocessor and, before
touching the partition map, warn that a full-disk install will permanently
disable the Touch Bar, camera and Touch ID until macOS is reinstalled — and
point at the free-space install option that preserves the existing ESP.

Being told *before* the install rather than discovering it afterwards is the
whole ask. A guard or a confirmation prompt would be enough.

## Steps to reproduce

1. Take a Touch Bar Mac with a T1 or T2 chip (e.g. MacBookPro14,2) running macOS
2. Install Omarchy from the ISO using the standard full-disk path
3. Boot Omarchy — the Touch Bar and camera are dead
4. `grep 05ac /sys/bus/usb/devices/*/idVendor` → the device reports `1281`,
   not `8600`

## Notes

Discussion [#2457](https://github.com/basecamp/omarchy/discussions/2457) covers
the same hardware and notes the "Free space install" option preserves macOS and
the T1 firmware. That option works — but it is only discoverable *after* you
already know this failure mode exists, which is exactly the gap.

Filing this as an issue rather than a suggestion because the outcome is
permanent hardware loss with no in-place recovery, not a missing feature.

## System

| | |
|---|---|
| Omarchy | 4.0.1-1 (stable) |
| Kernel | 7.1.9-arch1-2 |
| Model | MacBookPro14,2 (Mac-CAD6701F7CEA0921) |
| Firmware | 529.140.2.0.0, 06/23/2024 |
| CPU | Intel Core i7-7567U |
| GPU | Intel Iris Plus Graphics 650 (Kaby Lake-U GT3) |
| Disk | APPLE SSD AP1024J, 931.8G |

Prior to installing, this machine ran macOS Ventura with a fully working Touch
Bar, so the hardware itself is known good.