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186 lines
3.3 KiB
Markdown
186 lines
3.3 KiB
Markdown
# OMEN Linux ACPI / DSDT Patch Setup
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This guide documents the **working and reliable method** to fix boot and hardware issues (notably ACPI-related) on HP OMEN laptops under Linux using a custom DSDT override.
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⚠️ **Prerequisite:**
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This assumes **GRUB2 is installed and functioning correctly**.
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If you are using **Arch/NIX**, you may need to:
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* Install Linux initially using `noapic` or `pci=nobar`
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* Boot once with the same kernel parameters
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* Switch from `systemd-boot` to **GRUB2**
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Once GRUB is active, follow the steps below.
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---
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## Overview
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The solution involves:
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* Dumping your system’s **native DSDT**
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* Applying known fixes
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* Recompiling the table
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* Loading it via GRUB using `acpi /boot/dsdt.aml`
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⚠️ **Important:**
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The `acpi /boot/dsdt.aml` line **must be placed above the `linux` line** in the GRUB entry, or the override will not be detected.
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---
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## Step-by-Step Instructions
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### 1. Install Linux
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Install Linux using **one** of the following kernel parameters:
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* `noapic`
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* `pci=nobar`
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---
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### 2. Boot Linux
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Boot the installed system using the **same kernel parameter** you used during installation.
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(Keep an external keyboard/mouse handy if input devices are unstable.)
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---
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### 3. Update the System
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Update to the **latest kernel** available for your distribution.
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---
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### 4. Install ACPI Tools
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Install the required ACPI/DSDT tools.
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On NixOS:
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```bash
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coreboot-tools.x64
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```
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On most other distros:
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```bash
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iasl (ACPICA tools)
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```
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---
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### 5. Dump Your DSDT
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Extract your system’s current DSDT:
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```bash
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cat /sys/firmware/acpi/tables/DSDT > dsdt.dat
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```
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---
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### 6. Decompile the DSDT
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```bash
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iasl -d dsdt.dat
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```
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This will generate `dsdt.dsl`.
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---
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### 7. Apply Required Fixes
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Edit `dsdt.dsl` and apply the changes from the following commit:
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🔗
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[https://github.com/j0hnwang/OMEN-Transcend-16-ACPI-fix/commit/2e4feda9529c09133f5f7e9623ec11226db581](https://github.com/j0hnwang/OMEN-Transcend-16-ACPI-fix/commit/2e4feda9529c09133f5f7e9623ec11226db581)
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Use a text editor such as:
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```bash
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nano dsdt.dsl
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# or
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vim dsdt.dsl
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```
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---
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### 8. Recompile the DSDT
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```bash
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iasl -tc dsdt.dsl
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```
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If successful, this will produce:
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```
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dsdt.aml
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```
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---
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### 9. Copy the AML File to /boot
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```bash
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sudo cp dsdt.aml /boot/
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```
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---
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### 10. Reboot
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Reboot your system normally.
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---
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### 11. Modify GRUB Entry (Temporary Test)
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At the GRUB menu:
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1. Highlight your Linux entry
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2. Press **`e`** to edit
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3. Add the following line **above** the `linux` line:
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```
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acpi /boot/dsdt.aml
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```
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4. Boot with **Ctrl + X** or **F10**
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---
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### 12. Verify Boot
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If the system boots normally **without `noapic` / `pci=nobar`**, the patch is working.
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🎉 **Success**
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---
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### 13. Optional: Speaker Fix
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You can optionally apply John’s additional patch for speaker functionality (not tested here yet).
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---
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## ⚠️ Important Warning About Precompiled AML Files
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Avoid using the precompiled `dsdt.aml` provided in:
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[https://github.com/j0hnwang/OMEN-Transcend-16-ACPI-fix](https://github.com/j0hnwang/OMEN-Transcend-16-ACPI-fix)
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**Reasons:**
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* That AML is compiled specifically for **one laptop**
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* Your ACPI tables **will differ**
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* Using it caused GRUB to hang and prevented disk detection
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✅ **Always dump, edit, and compile your own DSDT** from:
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```bash
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/sys/firmware/acpi/tables/DSDT
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```
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This ensures compatibility and avoids serious boot issues.
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