Surface Laptop 7 display glitch after boot (Snapdragon) – external monitor fine

In your case:

1. Works in Safe Mode
2. External monitor works
3. Breaks after driver loads

All these suggest it's not a hardware issue but it's a display driver / update bug.

Open Device Manager and uninstall the Display Driver.

Reboot.

Install ONLY official Surface drivers (not Windows Update first)

Download from Microsoft:

Surface Laptop 7 driver pack.

Based on the symptoms and the troubleshooting already done, this aligns more with a driver/firmware or panel pipeline issue than with the Snapdragon X Elite GPU itself, but hardware cannot be fully ruled out without Surface diagnostics.

Key points from the scenario:

• Internal panel glitches only in normal Windows mode.
• Safe Mode (basic display driver) works correctly.
• External monitor over USB‑C works correctly.
• Display drivers and Surface Panel Driver have already been reinstalled.

This pattern matches a problem in the Surface display stack (panel driver/firmware or display driver) rather than a general GPU failure.

Recommended next steps:

1. Confirm latest Surface Laptop 7 firmware and drivers
   Surface Laptop 7th Edition (Snapdragon) has active driver and firmware servicing through 2030, and recent updates specifically target display reliability and black‑screen issues when resuming from sleep:
   • June 2025 update includes:
     • “Improves overall stability, reducing occurrences of unexpected crashes and error screens.”
     • “Minimizes display timeout events and reduces the frequency of recovery cycles.”
     • “Resolves an issue that caused the screen to remain black when resuming from Sleep mode.” Ensure Windows 11 Version 24H2 or later is installed and that all Surface firmware updates from Windows Update are applied.
2. Run standard Windows display troubleshooting for flicker/distortion
   Even though this is more than simple flicker, follow the official steps for isolating driver vs. app issues:
   • Press Windows logo key + Ctrl + Shift + B to reset the graphics driver when the distortion appears.
   • Use Ctrl + Alt + Delete → open Task Manager:
     • If Task Manager also shows distortion/flicker, the display driver is implicated. If the distortion persists and affects everything including Task Manager, this further confirms a low‑level display driver/panel issue.
3. Check for app‑independent behavior
   Since Safe Mode is fine, test right after a clean boot (no third‑party startup apps) to rule out any incompatible software. If the distortion still appears immediately after sign‑in with a clean boot, it is unlikely to be caused by user apps.
4. Use Surface display troubleshooting guidance
   Follow the Surface display support flow:
   • Start from “My Surface screen is flickering, is distorted, or has other display issues” under the Surface screen help page.
   • Also review “I see black or blank screens on my Surface” if the panel sometimes goes black after the distortion. These guides walk through additional checks (brightness/contrast features, external display tests, etc.) and help determine if the issue is likely hardware.
5. Differentiate software vs. hardware and contact support
   Given:
   • Safe Mode and external displays are fine.
   • The issue is reproducible only in normal mode with the full Surface display stack.
   • Firmware updates exist that address related resume/display issues on Surface Laptop 7.
   If the device is fully updated (Windows 11 24H2+, latest Surface firmware) and the problem persists after driver reset and clean boot, this should be treated as a potential hardware or low‑level firmware defect. At that point, the next step is to contact Surface Support and run through their diagnostics; they can determine if a repair or replacement is required.

In summary, the behavior is more consistent with a Surface display driver/firmware problem than with the Snapdragon GPU itself. If all current updates are installed and the issue continues, support should evaluate the device for possible panel or mainboard replacement.

References:

• Surface Laptop (7th Edition) update history
• Surface devices driver and firmware lifecycle for Windows-based devices
• Troubleshoot screen flickering in Windows
• Get help with Surface screen issues