Lenovo Legion Slim 5i Nvidia RTX Not Switching Windows 11: Vantage GPU Mode Fix

Lenovo Legion Slim 5i Gen 8 is a thin gaming laptop featuring Nvidia RTX 40 series discrete graphics with Intel Iris Xe integrated graphics in a hybrid switching configuration. On Windows 11, games and applications always run on Intel Iris Xe regardless of settings, the Nvidia RTX GPU does not appear in Task Manager GPU section, or right-clicking an application to select which GPU to use shows only one option. The hybrid graphics switching failure prevents the Nvidia RTX from being used for gaming and reduces performance significantly. I have fixed GPU switching failures on Legion Slim 5i Gen 8 units and this guide covers all proven solutions.

Why Lenovo Legion Slim 5i Nvidia RTX Not Switching Windows 11

Lenovo Vantage Hybrid Mode Not Enabled or GPU Mode Set to Integrated

Lenovo Legion Slim 5i Gen 8 uses Lenovo Vantage to control the GPU operation mode. The available modes are Hybrid mode where Nvidia Optimus switches between Intel and Nvidia automatically, and Performance mode where Nvidia RTX drives all output directly. If the GPU mode is set to Integrated in Lenovo Vantage, the Nvidia RTX is powered down and all graphics tasks are handled by Intel Iris Xe only. Applications requesting the Nvidia GPU through the Windows graphics preference system receive no response. Setting the GPU mode to Hybrid or Performance in Lenovo Vantage and rebooting enables the Nvidia RTX.

Nvidia Optimus Driver Not Setting Per-Application GPU Preferences Correctly

Nvidia Optimus technology relies on the Nvidia driver correctly registering game executables in the GPU preference database. When the Nvidia RTX driver is outdated or has a corrupted Optimus database, games launch on Intel Iris Xe even when the Nvidia GPU is available. Applications set to High performance GPU in Windows Settings may still default to Iris Xe because the Optimus driver is not routing them correctly. Updating the Nvidia driver and resetting the graphics preference settings resolves the Optimus routing failure.

Windows 11 Graphics Preference Override Forcing Integrated GPU

Windows 11 has a Graphics settings panel where applications can be assigned to use Integrated graphics, High performance GPU, or Let Windows decide. If a game executable was previously set to Integrated in this settings panel, it always runs on Intel Iris Xe regardless of Lenovo Vantage settings or Nvidia Optimus preferences. A setting added for one version of a game can persist incorrectly after updates change the game executable path. Reviewing and clearing these per-app GPU assignments resolves cases where specific applications refuse to use the Nvidia RTX.

How to Fix Lenovo Legion Slim 5i Nvidia RTX Not Switching Windows 11

Step 1 — Set GPU Mode to Hybrid in Lenovo Vantage

Open Lenovo Vantage and go to My Device Settings. Find the Display or Game Mode section and look for GPU Mode or Graphics Switching. Change the setting from Integrated to Hybrid Graphics. Click Save or Apply and reboot when prompted — a reboot is always required for GPU mode changes to take effect on Legion Slim 5i. After rebooting, open Task Manager and go to the Performance tab. You should now see both Intel Iris Xe and Nvidia RTX listed under GPU. Open a game and monitor Task Manager to verify the Nvidia RTX GPU usage increases during gameplay, confirming the switch is working.

Step 2 — Set Per-Application GPU Preference to High Performance

Open Windows Settings, System, Display, Graphics. Under Custom options for apps, click Browse and navigate to the game or application executable. Select the executable and click Add. Once added, click Options next to it and select High performance to assign it to the Nvidia RTX. Click Save. Repeat for all games showing low performance. Also check for existing entries that may be set to Power saving — change these to High performance. After setting preferences, launch the game and check Task Manager to confirm the Nvidia RTX is now handling the workload. The High performance preference overrides Optimus automatic selection.

Step 3 — Reinstall Nvidia RTX Driver Using Lenovo-Provided Version

Go to Lenovo support page and search for Legion Slim 5i Gen 8 by model number. Under Drivers and Software, download the Nvidia RTX driver in the Display section. Download Display Driver Uninstaller and boot into Safe Mode. Run DDU to remove all Nvidia driver components cleanly. After rebooting normally, run the Lenovo Nvidia driver installer. Avoid the GPU Mode Only option if it appears — use the full driver installation. Reboot after installation. Open Lenovo Vantage and confirm GPU mode is set to Hybrid. Test a game and verify Nvidia RTX activity in Task Manager during play.

My Legion Slim 5i was playing all games on Intel graphics. Task Manager showed zero Nvidia RTX usage. Went into Lenovo Vantage and found GPU Mode was set to Integrated. Changed to Hybrid, rebooted, and now games run on RTX with GPU usage jumping to 80-90 percent during gameplay. The integrated setting completely powers off the discrete GPU. — Kevin L., Lenovo Gaming Community

Frequently Asked Questions

Should I use Hybrid or Performance mode on Lenovo Legion Slim 5i for gaming?

Performance mode (Discrete GPU) provides the highest gaming performance because it routes display output directly through the Nvidia RTX without the Optimus switching overhead. Hybrid mode uses less power but adds a small latency through the Optimus multiplexing. For competitive gaming requiring maximum frame rates, use Performance mode. For battery-conscious gaming or mixed use where you switch between gaming and productivity, Hybrid mode balances performance and battery life.

What Nvidia RTX GPU options are available in Lenovo Legion Slim 5i Gen 8?

Lenovo Legion Slim 5i Gen 8 is available with Nvidia GeForce RTX 4060 and RTX 4070 GPU options depending on the configuration. Both GPUs support Nvidia DLSS 3, Frame Generation, and Ray Tracing. The RTX 4070 provides approximately 25 to 35 percent higher performance than the RTX 4060 at maximum settings. Both configurations use the same Optimus hybrid switching system requiring the same GPU mode management in Lenovo Vantage.

Does Lenovo Legion Slim 5i Gen 8 support G-Sync or FreeSync?

Lenovo Legion Slim 5i Gen 8 supports Nvidia G-Sync Compatible mode, which uses the same Adaptive Sync technology as FreeSync. G-Sync Compatible requires Performance mode with the display connected directly to the Nvidia RTX. In Hybrid mode, G-Sync is typically not available because the output passes through the Intel iGPU. The Slim 5i display panel supports variable refresh rate up to 165Hz or 240Hz depending on the configuration.

Why does Lenovo Legion Slim 5i battery drain faster after switching to Discrete mode?

Discrete GPU mode keeps the Nvidia RTX powered on continuously regardless of workload. At idle, the RTX draws significantly more power than Intel Iris Xe. This constant power draw reduces battery life by approximately 30 to 50 percent compared to Hybrid mode where the Nvidia GPU powers down when not needed. Switch to Hybrid mode when on battery for everyday tasks and switch to Discrete Only when gaming on AC power for maximum performance.

Conclusion

Lenovo Legion Slim 5i Nvidia RTX not switching on Windows 11 is caused by Lenovo Vantage GPU mode being set to Integrated which powers off the Nvidia GPU, the Nvidia Optimus driver routing applications to Iris Xe due to a corrupted graphics preference database, or Windows graphics settings explicitly assigning specific applications to the integrated GPU. Check Lenovo Vantage GPU mode first and switch from Integrated to Hybrid as the immediate fix requiring a reboot, assign high-performance GPU preference to games in Windows Settings, System, Display, Graphics for applications that still default to Iris Xe, and reinstall the Lenovo-validated Nvidia driver using DDU for a clean installation if Optimus routing fails persistently. The Lenovo Vantage GPU mode check and reboot resolves the vast majority of reported GPU switching failures on Legion Slim 5i Gen 8.