Steam Machine gets stuck on black screen after SteamOS update – blue LEDs pulse but system won't boot

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Evaluación

Dificultad
4/5
Tiempo estimado
3-5 días
Aptitud para principiantes
30/100
Tipo de issue
Error
Claridad
Bastante claro
Estado de actividad
Activo
Stack tecnológico
linux
Área
operating-systems

Línea de trabajo

Start by comparing the working Neptune 618/EFI-A installation with the failing Neptune 72/EFI-B installation, using the available system logs and boot records to identify where startup stops. Check the SteamOS update, AMD graphics/DRM, kernel, firmware, and bootloader changes associated with the regression, and look for any existing SteamOS issue tracking the same rollback-to-Neptune-618 behavior. The issue is done when there is a confirmed cause or tested fix, or a documented workaround that avoids reinstalling SteamOS or erasing user data.

Escrito por el modelo de indexación a partir del texto del issue.

Descripción

Your system information
  • Device: Valve Steam Machine (2026)
  • Steam client version: Not yet confirmed
  • SteamOS version: 3.8.28, build 20260922.1 (currently using rollback)
  • Working kernel: Neptune 618
  • Problematic kernel: Neptune 72
  • Opted into Steam client beta?: Not confirmed
  • Opted into SteamOS beta?: Not confirmed
  • Have you checked for updates in Settings > System?: Yes. Updates are available but not installed.
Please describe your issue in as much detail as possible

After updating SteamOS, my Steam Machine developed an intermittent startup problem.

The updated version successfully booted at least once and worked normally. However, after restarting, the machine began getting stuck during startup with a completely black screen.

When this happens:

  • The blue LEDs fade in and out continuously.
  • The fans continue spinning.
  • The monitor receives no picture.
  • My Steam Controller connects, but pressing the Steam button does nothing.
  • Pressing the power button once has no effect.
  • Holding the power button forces the machine to shut down.
  • Turning it back on results in the same problem.

I have tested two different monitors and both HDMI and DisplayPort, with the same result.

Rolling back to the previous SteamOS version restores normal operation.

The working installation uses the Neptune 618 kernel on EFI-A. The problematic updated installation used Neptune 72 on EFI-B.

I have checked the available system logs but haven't found an obvious AMD graphics or DRM error.

I would like to know whether this is a known SteamOS update, kernel, firmware or bootloader issue and whether there is a fix that doesn't require reinstalling SteamOS or wiping my data.

Steps for reproducing this issue
  1. Boot the Steam Machine using the updated SteamOS version (Neptune 72).
  2. Use the system normally.
  3. Restart the machine.
  4. The machine gets stuck with pulsing blue LEDs, spinning fans and a completely black screen.

The issue has occurred repeatedly. Rolling back to Neptune 618 restores normal startup.

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