# AMD Radeon 9700 AI PRO (Navi 48) Tuning Guide

This guide show you how to enable undervolting and raise the power limit on the Radeon PRO R9700 on Fedora 43. 

## 1. Prerequisites (Enable Overclocking)

The `ppfeaturemask` must be set to unlock voltage control.

```bash
sudo grubby --update-kernel=ALL --args="amdgpu.ppfeaturemask=0xffffffff"
```

**Reboot your system after running this.**

## 2. Identify Your GPU

You need the **PCI Bus ID** of the target card (e.g., `07:00.0`).

Run this command to list your AMD GPUs:

```bash
lspci -nn | grep "VGA" | grep "AMD"
```

*Example output:*
`07:00.0 VGA compatible controller...`
*(In this example, your ID is `0000:07:00.0`)*

## 3. Tuning Script

Save this script as `tune_r9700.sh`.

**Important:** Edit the `PCI_ID` variable at the top to match the ID you found in Step 2.

```bash
#!/bin/bash

# --- CONFIGURATION ---
# Replace this with your specific PCI ID from 'lspci'
# Format must be 0000:XX:XX.X
PCI_ID="0000:07:00.0"
# ---------------------

# 1. Robustly Find the Card Name (e.g., card1) directly from the PCI Bus
# We look inside the PCI device's 'drm' folder for a folder starting with 'card' followed only by numbers.
if [ ! -d "/sys/bus/pci/devices/$PCI_ID/drm" ]; then
    echo "Error: PCI Device $PCI_ID not found or has no DRM driver attached."
    exit 1
fi

# This finds 'card1' but ignores 'card1-DP-6'
CARD_NAME=$(ls "/sys/bus/pci/devices/$PCI_ID/drm" | grep -E '^card[0-9]+$' | head -n 1)

if [ -z "$CARD_NAME" ]; then
    echo "Error: Could not determine card name for $PCI_ID"
    exit 1
fi

# Construct the clean path (e.g., /sys/class/drm/card1)
CARD_PATH="/sys/class/drm/$CARD_NAME"

echo "Tuning GPU: $CARD_NAME (at $CARD_PATH)..."

# 2. Force Manual Performance Level (Required for UV)
# We use 'tee' without pipe to ensure exact errors are caught, but your 'echo | sudo tee' method is fine.
echo "manual" | sudo tee "$CARD_PATH/device/power_dpm_force_performance_level" > /dev/null
if [ $? -ne 0 ]; then echo "Failed to set Manual mode. Check permissions/path."; exit 1; fi

# 3. Apply -75mV Undervolt
echo "vo -75" | sudo tee "$CARD_PATH/device/pp_od_clk_voltage" > /dev/null
echo "c" | sudo tee "$CARD_PATH/device/pp_od_clk_voltage" > /dev/null
echo "Applied Undervolt (-75mV)"

# 4. Set Power Limit to 315W
# Find the hwmon directory strictly inside the device
HWMON_DIR=$(find "$CARD_PATH/device/hwmon/" -maxdepth 1 -name "hwmon*" | head -n 1)
if [ -n "$HWMON_DIR" ]; then
    echo "315000000" | sudo tee "$HWMON_DIR/power1_cap" > /dev/null
    echo "Applied Power Limit (315W)"
else
    echo "Error: Could not find hwmon directory for power limit."
fi
```

### Usage

```bash
chmod +x tune_r9700.sh
sudo ./tune_r9700.sh
```

## 4\. Verification

Run these commands to confirm settings are active.

**Check Undervolt:**

```bash
# Look for: OD_VDDGFX_OFFSET: -75mV
cat /sys/class/drm/card0/device/pp_od_clk_voltage 
```

**Check Power Limit:**

```bash
# Should be ~315 W
cat /sys/class/drm/card0/device/hwmon/hwmon*/power1_cap 
```