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Nested games on the Bazzite host saw the wrong display: refresh capped at 60 Hz, the box's connected TV's EDID modes leaking in (DOOM landed on 2560×1440@60), and the resolution fixed at whatever the always-on session was launched at — the client's requested mode never reached the game. Root causes: the session-plus gamescope command has no --nested-refresh (Xwayland advertises 59.96 Hz for every mode), --prefer-output HDMI-A-1 makes gamescope read the TV EDID, and the ATTACH model launches one fixed-resolution session. New vdisplay path: PUNKTFUNK_GAMESCOPE_SESSION=<client> — the host LAUNCHES gamescope-session-plus headless AT THE CLIENT'S mode and relaunches it when the mode changes. Injected via a host-written GAMESCOPE_BIN wrapper (--nested-refresh $PF_HZ, the flag session-plus doesn't expose) + DRM_MODE=cvt (gamescope generates clean CVT modes at that refresh instead of the TV's EDID). The session runs as a transient `systemd-run --user` unit (clean cgroup teardown of the Steam tree); state lives in a host-lifetime static (MANAGED_SESSION), NOT in GamescopeDisplay (which is per-client-session) — so a same-mode reconnect REUSES the running session instantly (no Steam restart) while a different mode RELAUNCHES it (games can't change output mode live; a game/Steam restart on a mode change is unavoidable and acceptable). Reuses the existing node + EIS auto-discovery (find_gamescope_node / find_gamescope_eis_socket, factored into point_injector_at_eis) and the existing mid-stream Reconfigure → vd.create(mode) machinery — no protocol or m3 control-flow change. Validated live on bazzite (RTX 4090): games' Xwayland now advertises 5120×1440 @ 239.90 Hz as the preferred mode (was 59.96), the TV's 3840×2160/4096×2160@60 modes are gone, frames stream; reconnect at 1920×1080@120 relaunches and games see that; same-mode reconnect reuses with no restart and frames flow instantly. scripts: host.env.example documents PUNKTFUNK_GAMESCOPE_SESSION (mutually exclusive with the legacy NODE=auto attach); punktfunk-steam-session.service marked deprecated (superseded — must not run alongside the host-managed path). Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
45 lines
2.4 KiB
Desktop File
45 lines
2.4 KiB
Desktop File
# punktfunk headless Steam session — systemd USER unit (Bazzite / SteamOS-like hosts).
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#
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# DEPRECATED — superseded by the host-managed session (`PUNKTFUNK_GAMESCOPE_SESSION=steam` in
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# host.env). The host now LAUNCHES gamescope-session-plus on demand AT THE CLIENT'S mode (so games
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# see the client's exact resolution + refresh, dynamically per connection) and relaunches it on a
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# mode change. Do NOT enable this fixed-resolution unit alongside the host-managed path — two
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# gamescope sessions publish two Video/Source nodes and break node discovery. Kept only for the
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# legacy fixed-mode ATTACH setup (`PUNKTFUNK_GAMESCOPE_NODE=auto`); it caps every game at this
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# unit's resolution. The PREREQS below still apply to the host-managed path too.
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#
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# Prereq — free Steam from the local gaming session (so this owns it), on a headless box:
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# sudo loginctl enable-linger $USER # user services run without a graphical login
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# sudo systemctl set-default multi-user.target # don't auto-start the local gaming session
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# sudo systemctl isolate multi-user.target # stop it now (or reboot)
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# sudo cp scripts/99-punktfunk-net.conf /etc/sysctl.d/ && sudo sysctl --system # big UDP buffers (4K/5K)
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#
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# Install:
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# mkdir -p ~/.config/systemd/user && cp scripts/punktfunk-steam-session.service ~/.config/systemd/user/
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# # edit SCREEN_WIDTH/HEIGHT below to your client's resolution, then:
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# systemctl --user daemon-reload && systemctl --user enable --now punktfunk-steam-session
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#
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# Revert to local gaming mode anytime:
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# systemctl --user disable --now punktfunk-steam-session
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# sudo systemctl set-default graphical.target && sudo systemctl isolate graphical.target
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[Unit]
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Description=punktfunk headless Steam Big Picture session (gamescope-session-plus)
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After=pipewire.service pipewire-pulse.service
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Wants=pipewire.service
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[Service]
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# Headless gamescope at the streamed resolution. gamescope-session-plus reads all of these from
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# the environment (see /usr/share/gamescope-session-plus/gamescope-session-plus). Set the WIDTH/
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# HEIGHT to your client's mode; CUSTOM_REFRESH_RATES advertises selectable rates to Big Picture.
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Environment=BACKEND=headless
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Environment=SCREEN_WIDTH=5120
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Environment=SCREEN_HEIGHT=1440
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Environment=CUSTOM_REFRESH_RATES=60,120,240
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Environment=STEAM_DISPLAY_REFRESH_LIMITS=60,240
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ExecStart=/usr/share/gamescope-session-plus/gamescope-session-plus steam
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Restart=on-failure
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RestartSec=5
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[Install]
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WantedBy=default.target
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