From 9b8320cead708e70a9db4729d25ed7258bc12208 Mon Sep 17 00:00:00 2001
From: nnduc <nnduc@home>
Date: Sun, 27 Sep 2026 17:16:30 +0700
Subject: [PATCH] adaptive sync

---
 README.md               |  6 ++++++
 sway/config             |  4 +++-
 sway/scripts/lock-now   | 10 +++++-----
 sway/scripts/vrr-follow | 14 ++++++++++++++
 4 files changed, 28 insertions(+), 6 deletions(-)
 create mode 100755 sway/scripts/vrr-follow

diff --git a/README.md b/README.md
index 92b519c..a2e8750 100755
--- a/README.md
+++ b/README.md
@@ -189,6 +189,12 @@ sudo emerge --ask games-util/gamemode
 - `mangohud` is **not in the main Gentoo tree** — GURU overlay
   (`sudo emerge --ask games-util/mangohud` after enabling GURU).
 
+Adaptive sync (sway): the desktop runs at a fixed 240 Hz with VRR off, because
+sway only renders on change and idle frame rates fall below the panel's 48 Hz
+floor (out of LFC range → flicker). `sway/scripts/vrr-follow` turns VRR on for
+DP-1 only while the visible workspace has a fullscreen window; `lock-now` turns
+it off while locked. Needs `jq`.
+
 ### GPU monitoring & tuning
 
 **Arch**
diff --git a/sway/config b/sway/config
index 8ed5263..2f26caa 100755
--- a/sway/config
+++ b/sway/config
@@ -38,7 +38,9 @@ exec --no-startup-id ~/.config/sway/scripts/wallpaper-rotate $wallpaper_dir
 # You can get the names of your outputs by running: swaymsg -t get_outputs
 # adaptive_sync on the desktop makes sway stutter/flicker; 120Hz avoids AMD
 # VRAM clock flicker at high refresh (see README).
-output DP-1 mode 1920x1080@120Hz adaptive_sync off allow_tearing yes
+output DP-1 mode 1920x1080@240Hz adaptive_sync off allow_tearing yes
+exec_always pkill -xf '/bin/sh /home/nnduc/.config/sway/scripts/vrr-follow'; ~/.config/sway/scripts/vrr-follow
+#output DP-1 mode 1920x1080@240Hz adaptive_sync on allow_tearing yes
 
 ### Idle configuration
 #
diff --git a/sway/scripts/lock-now b/sway/scripts/lock-now
index 5292c3e..16d78b0 100755
--- a/sway/scripts/lock-now
+++ b/sway/scripts/lock-now
@@ -1,8 +1,8 @@
 #!/bin/bash
 wall_dir="${1:?wallpaper directory required}"
 img=$(find "$wall_dir" -type f \( -iname "*.jpg" -o -iname "*.jpeg" -o -iname "*.png" \) | shuf -n1)
-if [ -n "$img" ]; then
-    exec swaylock -f -i "$img"
-else
-    exec swaylock -f
-fi
+swaymsg -q output DP-1 adaptive_sync off            # lock screen redraws rarely: fixed 240 Hz
+swaylock -f ${img:+-i "$img"}
+# once unlocked, let vrr-follow decide again (in background so swayidle/suspend aren't held up)
+( while pgrep -x swaylock >/dev/null; do sleep 1; done
+  ~/.config/sway/scripts/vrr-follow once ) &
diff --git a/sway/scripts/vrr-follow b/sway/scripts/vrr-follow
new file mode 100755
index 0000000..5fc9f27
--- /dev/null
+++ b/sway/scripts/vrr-follow
@@ -0,0 +1,14 @@
+#!/bin/sh
+# adaptive_sync on DP-1 only while the visible workspace shows a fullscreen window
+OUT=DP-1
+update() {
+  if [ "$(swaymsg -t get_tree | jq --arg o "$OUT" '
+      .nodes[] | select(.name==$o) as $out | $out.nodes[]
+      | select(.name==$out.current_workspace)
+      | [.. | objects | select((.fullscreen_mode? // 0) > 0)] | length')" -gt 0 ]
+  then s=on; else s=off; fi
+  [ "$s" != "$last" ] && swaymsg -q output "$OUT" adaptive_sync "$s" && last=$s
+}
+[ "$1" = once ] && { update; exit; }
+update
+swaymsg -t subscribe -m '["workspace","window"]' | while read -r _; do update; done