Xbox Ally X - Fan spins up to maximum speed after waking from sleep

[BrynnChu]

Your system information

• Steam client version: 3.9 20251218
• SteamOS version: 3.9 20251218
• Opted into Steam client beta?: [Yes]
• Opted into SteamOS beta?: [Yes]
• Have you checked for updates in Settings > System?: [Yes]

Please describe your issue in as much detail as possible:

If the system is put into sleep mode by pressing the power button while the fan is running or during a game, then woken up after a few minutes or hours, the fan speed ramps up to the maximum and then gradually decreases back to normal.

Steps for reproducing this issue:

1. Launch a game while the fan is running
2. Press the power button to put the device into sleep mode
3. Wait for a few minutes to several hours
4. Wake up the device

[BrynnChu]

I’ve observed the same issue on Windows and Bazzite as well, so this is likely an MCU firmware issue or a BIOS issue on the Xbox Ally X. It may only be fixable by waiting for an official fix from ASUS.

[matte-schwartz]

Yes, known BIOS issue. I have the same issue on mine fwiw.