Gamescope

Gamescope は、Steam Deckで使用される Valve が開発したマイクロコンポジタです。その目的は、ゲームに特化したアイソレートされたコンポジタを提供し、以下のようなゲームに特化した機能をサポートすることです。

解像度のスプーフィング
AMD FidelityFX™ Super ResolutionやNVIDIA Image Scalingを使ったアップスケーリング
フレームレートの制限

マイクロコンポジタとして、既存のデスクトップ環境の上にネストされたセッションとして実行するよう設計されていますが、埋め込みコンポジタとしても使用することができます。

現在、Wayland クライアントのネイティブサポートはありません [1]。Wayland セッションでは、XWayland を使用します。

インストール

Gamescope は、gamescope パッケージ（または gamescope-git^AUR パッケージ）でインストールできます。さらに、メインラインビルドには含まれていない追加のパッチが含まれた gamescope-plus^AUR もあります。

要件

AMD：Mesa 20.3 以上
Intel：Mesa 21.2 以上
NVIDIA：プロプライエタリドライバー 515.43.04 以上、および nvidia-drm.modeset=1 カーネルパラメータ

Usage

Gamescope offers many options, far to many to cover here. For a full list use the gamescope --help command from a terminal.

From a desktop session

The following command will run supertuxkart using Gamescope and force a 1920x1080 resolution at 60 FPS

$ gamescope -W 1920 -H 1080 -r 60 -- supertuxkart

From Steam

You can force Steam to run in Big Picture Mode using Gamescope by using the following command:

$ gamescope -e -- steam -gamepadui

ノート: The -e flag tells Gamescope to enable Steam Integration.

You can also run games from Steam using Gamescope by adding the following to the games launch options

gamescope -- %command%

ノート: It is still required that you set flags such as resolution, FPS etc when launching from Steam otherwise Gamescope will launch at an incorrect resolution. You can do this in the same way as from a terminal, for example

gamescope -W 1920 -H 1080 -r 60 -- %command%

From Wine

To run programs using Gamescope through Wine, simply append wine followed by the executable.

$ gamescope -W 1920 -H 1080 -r 60 -- wine supertuxkart

Almost all the popular Wine managers such as Lutris, Bottles, and PlayOnLinux have support for Gamescope. Using them is as simple as installing the desired Gamescope package and checking the Use Gamescope (or similar) option.

ノート: Wine managers also tend to have a GUI interface to configure basic Gamescope options making them, in general, the easiest way to use Gamescope.

Through Flatpak

You can also use Gamescope from Flatpak versions of Wine managers and Steam in the same way as you would from a package install. It does however require that you first install Gamescope from Flathub with the following command:

$ flatpak install gamescope

Upscaling

The -U and -Y flags can be used to upscale games using AMD FidelityFX™ Super Resolution (FSR) or NVIDIA Image Scaling (NIS) respectively. You can also use -i for integer upscaling.

To upscale a 720p game to 1440p using FSR:

$ gamescope -h 720 -H 1440 -U -- supertuxkart

To run a game at 1080p internal resolution but display it at 4K using NIS:

$ gamescope -w 1920 -h 1080 -W 3840 -H 2160 -Y -- supertuxkart

HDR support

Gamescope is a requirement for HDR10 support when playing games, to make use of this feature you must launch your Gamescope session using the --hdr-enabled flag.

ノート: HDR support on Linux is still in its infancy and has many caveats. See HDR monitor support for details.

Troubleshooting

Switching to fullscreen causes low performance

This is a known bug when using Gamescopes fullscreen hotkey Meta+f, if you encounter this issue it can be worked around by using the fullscreen flag -f when launching the game.

Setting Gamescopes priority

Another known cause of low performance and/or stuttering is not having Gamescopes priority set correctly, you can tell this is the case if you see errors mentioning CAP_SYS_NICE in your terminal while Gamescope is running. The following command will fix this:

# setcap 'CAP_SYS_NICE=eip' $(which gamescope)