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docs: point rpm-ostree users at the working acpi-fix method #52

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4 changes: 4 additions & 0 deletions docs/linux/bazzite.md
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Expand Up @@ -226,6 +226,10 @@ systemctl reboot

## Post-Installation Configuration

### ACPI Fix (CPU C-States and P-States)

The [ACPI fix](../system/governor.md#acpi-fix-installation) enables CPU idle states and frequency scaling. On Bazzite, follow the **rpm-ostree variant** of Step 2 on that page: the plain-Fedora BLS instructions do not work here, because Bazzite's boot entries are managed by ostree.

### Temperature Sensors

For **read-only monitoring** (temperatures, voltages, fan speeds):
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19 changes: 19 additions & 0 deletions docs/system/governor.md
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Expand Up @@ -789,6 +789,23 @@ sudo grub-mkconfig -o /boot/grub/grub.cfg # Arch
sudo update-grub # Debian
```

On Bazzite, Fedora Atomic and other rpm-ostree distros:

The two variants above do not apply here. An ostree system has no `/boot/loader/entries/<machine-id>-<kernel>.conf` (its BLS entries are regenerated `ostree-*.conf` files, and hand edits do not survive the next deployment), which is why the Fedora command opens an empty file. Use the dracut override method already documented on the [Fedora CoreOS page](../linux/fedora-coreos.md#enable-acpi-c-states-and-p-states) instead. Only the `git clone` from Step 1 is needed; skip the cpio archive:

```bash
sudo mkdir -p /etc/dracut.conf.d/acpi/
sudo cp bc250-acpi-fix/*.aml /etc/dracut.conf.d/acpi/
sudo tee /etc/dracut.conf.d/99-acpi-override.conf <<'CONF'
acpi_override="yes"
acpi_table_dir="/etc/dracut.conf.d/acpi"
CONF
sudo rpm-ostree initramfs --enable
sudo systemctl reboot
```

After the reboot, `dmesg | grep SSDT` should report both tables found in the initrd, as shown on the CoreOS page.

**Step 3: Reboot and verify**

```bash
Expand All @@ -809,6 +826,8 @@ echo schedutil | sudo tee /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor
!!!warning "Kernel Update Note"
When you update to a new kernel, the BLS entry for the new kernel won't include the ACPI override. You'll need to edit the new entry or automate this with a kernel-install hook.

This does not apply to the rpm-ostree method: with `rpm-ostree initramfs --enable`, the initramfs is regenerated with the tables on every deployment, so the override persists across updates.

## Community Resources

- [NexGen3D SteamMachine Scripts](https://github.com/NexGen-3D-Printing/SteamMachine) — automated Bazzite setup (governor + swap/zram + CPU mitigations); links to this documentation as the main guide
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