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What is this?

This is a fork of the SteamOS compositor, currently based on version 1.35. It includes out of the box 4k (3840x2160) support, allows adjusting resolution/refresh rate through a configuration file, hides the annoying color flashing on startup of Proton games and adds a fix for games that start in the background, including Dead Cells, The Count Lucanor, most Feral games and probably others.

Installation

Arch Linux

Available as steamos-compositor-plus in the AUR.

SteamOS

Run the supplied steamos-install.sh script using the instructions below. This retrieves the latest pre-built binary release of the SteamOS compositor and copies it across to the right location.

  1. open a terminal
  2. run: wget https://raw.githubusercontent.com/gamer-os/steamos-compositor/master/steamos-install.sh && sudo bash steamos-install.sh
  3. restart your system

This will replace /usr/bin/steamcompmgr, /usr/bin/steamos/set_hd_mode.sh and /usr/bin/steamos-session with modified versions. The original files will be appended with .original. If there is a SteamOS update, the modified files may be overwritten and the install script will need to be run again.

Building from source

Should you wish to build from source instead of using the pre-built binaries, clone the repository and run autoreconf -i && ./configure && make

Configuration

On the first run, a configuration file will be created at ~/.config/steamos-compositor-plus. You can modify this file to manually adjust the screen resolution, refresh rate, and rotation.

The variables that can be defined in the configuration file are:

GOODMODES        an array of resolutions for the compositor to select from
GOODRATES        an array of refresh rates for the compositor to select from
ROTATION         a value of `left`, `right`, `normal`, or `inverted`
STEAMCMD         a string defining the full command line to be executed to start Steam
                 (see /usr/bin/steamos-session for the default command)
COMPOSITORCMD    a string defining the full command line to be executed to start the compositor/window manager
                 (defaults to steamcompmgr)

Usage

Add any options to the steamcompmgr command in /usr/bin/steamos-session.

The following additional options are available:

-b    Disable game focus hack
-p    Disable proton/wine color flash suppression hack
-g    Enable debug logging for game focus and proton hacks