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C0: disable VRR on ringtail DP-1 to stop OMEN panel flicker

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The OMEN 27i IPS pumps brightness when its refresh swings into the low
VRR range during low-framerate content (game cutscenes), producing a
~20Hz flicker that compounds over a session until a reboot. GPU health
is clean (no Xid/ECC/thermal); pinning fixed 165Hz eliminates it.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This commit is contained in:
Erich Blume 2026-05-27 12:59:29 -07:00
commit 753fa9cb63
2 changed files with 7 additions and 1 deletions
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docs/changelog.d/+ringtail-vrr-flicker.bugfix.md Normal file
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Disabled adaptive sync (VRR) on ringtail's DP-1 output. The OMEN 27i IPS panel pumps brightness when its refresh rate swings into the low VRR range during low-framerate content (e.g. game cutscenes), producing a flicker that worsened over a session until a reboot. Pinning the panel to a fixed 165Hz eliminates it.

7
nixos/ringtail/configuration.nix
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@ -337,7 +337,12 @@ in
output = { output = {
"DP-1" = { "DP-1" = {
mode = "2560x1440@165Hz"; mode = "2560x1440@165Hz";
adaptive_sync = "on"; # VRR off: the OMEN 27i IPS pumps gamma/brightness when the panel
# refresh swings into its low VRR range (e.g. low-fps game
# cutscenes), producing a ~20Hz flicker that compounds over a long
# session until a reboot. Fixed refresh at 165Hz eliminates it.
# If you want VRR back, cap in-game fps so refresh never dips low.
adaptive_sync = "off";
bg = "~/.config/sway/wallpaper.jpg fill"; bg = "~/.config/sway/wallpaper.jpg fill";
}; };
}; };