### System details

- 2019 Intel MacBook Pro with T2; exact DMI model identifier, screen size and GPU SKU have not been captured.
- Installed from `omarchy-4.0.4.iso`.
- The ISO contains `linux-t2` kernel `7.2.4-arch1-Watanare-T2-3-t2`; I have not separately recorded `uname -r` from the installed system.

### What's wrong?

After installation, I could reach the login screen, but logging in caused the fans to blast, the screen to go black, and the laptop to shut off.

I initially used a modified ISO with a **Safe Graphics** entry adding `nomodeset` to the live installer's kernel command line. This helped get through installation, but did not resolve the installed system's post-login failure. That initial modification only changed the live ISO's GRUB configuration.

This appears to corroborate #9609 on Omarchy 4.0.4. I found the workaround through [discussion #4917](https://github.com/omacom/omarchy/discussions/4917) and the [T2 Linux hybrid graphics guide](https://wiki.t2linux.org/guides/hybrid-graphics/). The symptoms match the guide's hybrid-graphics freeze/shutdown description, but I do not have crash logs establishing CPU CATERR or the precise root cause on my machine.

### What worked

A second custom ISO included a **T2 Mac Intel Graphics** boot entry using:

```text
apple_gmux.force_igd=1
```

This entry does **not** use `nomodeset`. The normal entry and a separate Safe Graphics (`nomodeset`) fallback remained available, with a visible 10-second boot menu.

The installer was also patched to write the following settings into the **installed target**, before its final `limine-update`/UKI build:

`/etc/modprobe.d/99-omarchy-mbp-gmux.conf`

```conf
options apple-gmux force_igd=y
```

`/etc/limine-entry-tool.d/99-omarchy-mbp-graphics.conf`

```bash
KERNEL_CMDLINE[default]+=" apple_gmux.force_igd=1"
```

`/etc/mkinitcpio.conf.d/99-omarchy-mbp-graphics.conf`

```bash
FILES+=(/etc/modprobe.d/99-omarchy-mbp-gmux.conf)
```

`/etc/udev/rules.d/30-omarchy-mbp-amdgpu-pm.rules`

```udev
SUBSYSTEM=="drm", DRIVERS=="amdgpu", ATTR{device/power_dpm_force_performance_level}="low"
```

The custom patch gates these installed settings by the machine's DMI product name: Intel preference plus AMD low power for `MacBookPro16,1`, `MacBookPro16,4` and `MacBookPro15,3`; Intel preference only for `MacBookPro15,1`, following the guide's Polaris power-management exception. Other models receive no installed-system changes. These are the patch's supported branches, **not** models I have personally tested. The live environment also includes a model-gated AMD low-power rule.

No permanent `nomodeset` was added to the installed system. No display connector was disabled, no dGPU-off service was enabled, and no sleep, fan or thermal-protection settings were changed. AMD low-power mode may reduce graphics performance.

### Result and limitations

The T2 Mac Intel Graphics entry showed a blank screen on the first attempt, but booted successfully on the second attempt. After proceeding with this modified image, my installation now works instead of failing after login.

This is a successful workaround on one machine, not a claim of long-term stability or proof that every setting above is necessary. Intel selection and the applicable power-management changes were bundled together, so I have not isolated their individual effects. External displays, suspend/resume and GPU-heavy applications have not been evaluated as part of this report. No `omarchy-debug` output or crash journal is attached yet.

### Suggested improvement

Please consider a supported, hardware-aware T2 hybrid-graphics workaround during installation, applied before the first installed boot, and an Intel Graphics boot option for affected Macs. Keeping a separate Safe Graphics fallback would also help. Merely adding `nomodeset` to the live installer does not address this post-install failure.

Related: #9609 and discussion #4917. Posting this as an additional 4.0.4 reproduction and a record of the working installer changes; feel free to consolidate it into #9609 if that is the preferred tracking issue.