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i3/scripts/dpms-inhibit

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+#!/bin/bash
+# Suspends xset screensaver/DPMS blanking while any visible workspace has a
+# fullscreen window (video, game, presentation), restores normal timeouts
+# once nothing is fullscreen.
+interval="${1:-5}"
+
+# Single-instance lock: i3 restarts/reloads re-run our autostart exec, so
+# without this, stray duplicate loops accumulate and race each other's state.
+exec 9>"/tmp/.dpms-inhibit-$(id -u).lock"
+flock -n 9 || exit 0
+
+has_fullscreen() {
+    python3 - <<'EOF'
+import json, subprocess, sys
+
+def is_fullscreen(node):
+    if node.get('window') and node.get('fullscreen_mode', 0) > 0: return True
+    return any(is_fullscreen(c) for c in node.get('nodes', []) + node.get('floating_nodes', []))
+
+def find_ws(node, name):
+    if node.get('type') == 'workspace' and node.get('name') == name: return node
+    for c in node.get('nodes', []) + node.get('floating_nodes', []):
+        r = find_ws(c, name)
+        if r: return r
+
+try:
+    wss = json.loads(subprocess.check_output(['i3-msg', '-t', 'get_workspaces'], stderr=subprocess.DEVNULL))
+    tree = json.loads(subprocess.check_output(['i3-msg', '-t', 'get_tree'], stderr=subprocess.DEVNULL))
+    for ws in wss:
+        if ws.get('visible'):
+            node = find_ws(tree, ws['name'])
+            if node and is_fullscreen(node):
+                sys.exit(0)
+except Exception:
+    pass
+sys.exit(1)
+EOF
+}
+
+inhibited=0
+while true; do
+    if has_fullscreen; then
+        xset s off
+        xset -dpms
+        inhibited=1
+    else
+        if [ "$inhibited" -eq 1 ]; then
+            xset s 300 300
+            xset dpms 300 600 900
+            inhibited=0
+        fi
+    fi
+    sleep "$interval"
+done