ValveSoftware / ValveSoftware/SteamOS

Gaming Mode uses incorrect display regardless of config/settings.

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Description

Your system information
  • Steam client version: 1788400362
  • SteamOS version: 3.9
  • Opted into Steam client beta?: Y
  • Opted into SteamOS beta?: Y
  • Have you checked for updates in Settings > System?: Y
Please describe your issue in as much detail as possible:

Using SteamOS 3.9 (Preview), primary monitor (connected on DP-3) does not work in Gaming Mode. Instead, it falls back to secondary monitor on HDMI, despite editing modes.cfg and making a custom environment.d/10-gamescope-session.conf

Rolling back to SteamOS 3.8.26 (Beta) resolved this issue; the configs are now respected and Gaming Mode uses my primary monitor.

Steps for reproducing this issue:
  1. Select SteamOS Preview (3.9)
  2. Reboot
  3. See display use wrong monitor.

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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by reproducing the issue on SteamOS 3.9 Preview using the listed steps, then inspect modes.cfg and environment.d/10-gamescope-session.conf while comparing behavior with SteamOS 3.8.26. Done means Gaming Mode uses the configured primary monitor on DP-3 instead of falling back to the HDMI display.

Written by the indexing model from the issue text.

Assessment

Tech stack
linux
Domain
operating-systems
Issue type
Bug
Difficulty
3/5
Estimated time
1-2 days
Activity status
Active
Clarity
Mostly clear
Newbie friendliness
55/100

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