108 lines
3.0 KiB
Markdown
108 lines
3.0 KiB
Markdown
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# AMD Radeon 9700 AI PRO (Navi 48) Tuning Guide
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This guide show you how to enable undervolting and raise the power limit on the Radeon PRO R9700 on Fedora 43.
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## 1. Prerequisites (Enable Overclocking)
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The `ppfeaturemask` must be set to unlock voltage control.
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```bash
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sudo grubby --update-kernel=ALL --args="amdgpu.ppfeaturemask=0xffffffff"
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```
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**Reboot your system after running this.**
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## 2. Identify Your GPU
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You need the **PCI Bus ID** of the target card (e.g., `07:00.0`).
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Run this command to list your AMD GPUs:
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```bash
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lspci -nn | grep "VGA" | grep "AMD"
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```
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*Example output:*
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`07:00.0 VGA compatible controller...`
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*(In this example, your ID is `0000:07:00.0`)*
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## 3. Tuning Script
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Save this script as `tune_r9700.sh`.
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**Important:** Edit the `PCI_ID` variable at the top to match the ID you found in Step 2.
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```bash
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#!/bin/bash
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# --- CONFIGURATION ---
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# Replace this with your specific PCI ID from 'lspci'
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# Format must be 0000:XX:XX.X
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PCI_ID="0000:07:00.0"
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# ---------------------
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# 1. Robustly Find the Card Name (e.g., card1) directly from the PCI Bus
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# We look inside the PCI device's 'drm' folder for a folder starting with 'card' followed only by numbers.
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if [ ! -d "/sys/bus/pci/devices/$PCI_ID/drm" ]; then
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echo "Error: PCI Device $PCI_ID not found or has no DRM driver attached."
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exit 1
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fi
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# This finds 'card1' but ignores 'card1-DP-6'
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CARD_NAME=$(ls "/sys/bus/pci/devices/$PCI_ID/drm" | grep -E '^card[0-9]+$' | head -n 1)
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if [ -z "$CARD_NAME" ]; then
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echo "Error: Could not determine card name for $PCI_ID"
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exit 1
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fi
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# Construct the clean path (e.g., /sys/class/drm/card1)
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CARD_PATH="/sys/class/drm/$CARD_NAME"
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echo "Tuning GPU: $CARD_NAME (at $CARD_PATH)..."
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# 2. Force Manual Performance Level (Required for UV)
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# We use 'tee' without pipe to ensure exact errors are caught, but your 'echo | sudo tee' method is fine.
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echo "manual" | sudo tee "$CARD_PATH/device/power_dpm_force_performance_level" > /dev/null
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if [ $? -ne 0 ]; then echo "Failed to set Manual mode. Check permissions/path."; exit 1; fi
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# 3. Apply -75mV Undervolt
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echo "vo -75" | sudo tee "$CARD_PATH/device/pp_od_clk_voltage" > /dev/null
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echo "c" | sudo tee "$CARD_PATH/device/pp_od_clk_voltage" > /dev/null
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echo "Applied Undervolt (-75mV)"
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# 4. Set Power Limit to 315W
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# Find the hwmon directory strictly inside the device
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HWMON_DIR=$(find "$CARD_PATH/device/hwmon/" -maxdepth 1 -name "hwmon*" | head -n 1)
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if [ -n "$HWMON_DIR" ]; then
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echo "315000000" | sudo tee "$HWMON_DIR/power1_cap" > /dev/null
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echo "Applied Power Limit (315W)"
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else
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echo "Error: Could not find hwmon directory for power limit."
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fi
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```
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### Usage
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```bash
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chmod +x tune_r9700.sh
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sudo ./tune_r9700.sh
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```
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## 4\. Verification
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Run these commands to confirm settings are active.
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**Check Undervolt:**
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```bash
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# Look for: OD_VDDGFX_OFFSET: -75mV
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cat /sys/class/drm/card0/device/pp_od_clk_voltage
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```
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**Check Power Limit:**
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```bash
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# Should be ~315 W
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cat /sys/class/drm/card0/device/hwmon/hwmon*/power1_cap
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```
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