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Why My Asus Laptop Kept Rebooting After Sleep and How to Fix It

Tired of your Asus laptop rebooting instead of waking from sleep? This post dives into a common, frustrating issue plaguing Asus users with MediaTek Wi-Fi adapters. The author meticulously details the surprising root cause and provides a simple, yet effective, fix that could save many from device-throwing levels of annoyance.

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The Lowdown

For three years, the author grappled with an infuriating problem: their Asus Zenbook Pro 17 would reboot from scratch after closing the lid, instead of waking from sleep. This meant lost work and a dead battery, a problem previously encountered with another Asus model. After numerous failed attempts to diagnose and fix the issue, the author believes they've finally found the definitive solution.

  • The Problem: Asus laptops, specifically those with the MediaTek Wi-Fi 6E MT7922 adapter, would perform a full reboot rather than resuming from sleep, often leading to a drained battery and a warm device in an enclosed bag.
  • The Culprit: The MediaTek Wi-Fi 6E MT7922 adapter's driver (mtkwlex) fails to properly handle the transition to a low-power state during Windows' "Modern Standby" protocol.
  • The Mechanism of Failure: When Windows attempts to transition to a deeper sleep and disconnect the network adapter, the faulty MediaTek driver crashes (generating Event ID 1033). This keeps the system partially awake, causing excessive battery drain and heat. Eventually, Windows triggers a forced wake-up (Event 507) due to exceeding the "Austerity Battery Drain Budget," but because the Wi-Fi driver is already unstable, the system crashes and reboots (Event 12).
  • The Solution: Disable the "Power Saving" option for the MediaTek Wi-Fi device within the Device Manager's Advanced tab.

This straightforward fix prevents the Wi-Fi device from attempting its problematic power-saving sleep mode, thereby avoiding the driver crash and subsequent system reboot. The author has confirmed the fix's stability over several weeks, offering a much-needed reprieve for those tormented by this specific hardware/software interaction.