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Auto theme mode does not work in tmux popup #19254
Description
Description
The new auto theme mode added in #18851 does not work when OpenCode is launched inside a tmux popup.
Auto theme mode works as expected when OpenCode is running:
- outside tmux
- in a normal tmux pane
- in a normal tmux window
The issue seems specific to tmux popup sessions.
Plugins
opencode-handoff
OpenCode version
1.3.2
Steps to reproduce
- Use the
Unlock Theme Modesetting from theCtrl+Pcommand panel to set the theme mode follow the OS. - Launch OpenCode inside a tmux popup.
- Change the OS appearance between light and dark mode.
- Observe that OpenCode in the popup does not follow the OS theme change.
Control cases:
5. Launch OpenCode outside tmux, or in a normal tmux pane/window.
6. Change the OS appearance again.
7. Observe that auto theme mode works correctly there.
Screenshot and/or share link
Video_2026-03-26_11-12-26_noaudio.mp4
Operating System
Arch Linux, Ubuntu
Terminal
kitty, ghostty
Reacted by Kenny-Ch, Umut Topuzoğlu, jepachecoam and Nikas
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Kenny-Ch commentedon Mar 26, 2026
Can confirm this also happens outside tmux, running opencode directly in Ghostty on macOS.
Environment:
Behavior: After updating to 1.3.2, opencode starts with a light theme regardless of the system appearance. Switching macOS back and forth between Dark/Light Mode does not trigger any theme change in opencode.
Workaround: Manually switch the theme via Ctrl+P → select a dark theme → then Lock Theme Mode. Not ideal but works.
This suggests the OSC 11 background color query in #18851 either isn't getting a response from Ghostty, or is misinterpreting it. The fallback when the query fails currently defaults to light — but I'd argue dark should be the fallback instead. Most developers using a terminal-based tool like opencode are running dark terminals, and an unexpected flash to a blinding white screen is a much worse experience than defaulting to dark when uncertain.
github-actions commentedon Jul 5, 2026
To stay organized issues are automatically closed after 60 days of no activity. If the issue is still relevant please open a new one.