Wispr Flow + MX Ergo Mouse Trigger — Full Debug Log

Last updated: 2026-04-29

What Eric wants

Press and hold the top front button (▲) on his Logitech MX Ergo trackball to push-to-talk in Wispr Flow. Release to stop dictating.

The chain of attempts (everything we tried)

Attempt 1: Tilt scroll wheel left → ⌃⌥W (Wispr push-to-talk)

Attempt 2: Switched to Wispr Flow's Hands-free mode (toggle, not hold)

Attempt 3: Top front side button (▲) → ⌃⌥\ via Logi Options+ Keyboard Shortcut

Attempt 4: Killed legacy Logi Options.app daemon (com.logitech.manager.daemon)

Attempt 5: 2-key combo ⌘\ instead of 3-key ⌃⌥\

Attempt 6: Single key Z on the same button (sanity test)

Attempt 7: Tried mapping ⌘\ to a different physical button (Mission control button on left side near trackball)

Attempt 8: Karabiner-Elements (already installed at v15.9.0)

Attempt 9: Killed Logi Options+ entirely so Karabiner could see raw button events

Attempt 10: Path A — record mouse button directly in Wispr Flow's shortcut field

The actual root cause (discovered late)

Karabiner-Elements is installed but its driver/grabber daemon is not running.

Diagnostic:

pgrep -lf "karabiner"
# Returns only:
#   karabiner_session_monitor
#   karabiner_console_user_server
# MISSING:
#   karabiner_grabber       ← the actual event interceptor
#   karabiner_observer

ls /Library/LaunchDaemons/ | grep -i karabiner
# Returns nothing — no privileged daemon installed

sudo launchctl list | grep -i karabiner
# Returns nothing — daemon never registered

Conclusion: Karabiner-Elements was installed at some point but its DriverKit system extension was never activated. The config file exists with rules, but no grabber means no rule fires. The pre-existing "middle click → Cmd+R in Chrome" rule that's been in the config has probably been silently broken too.

What needs to happen now

To make button5 → ⌘\ actually work, Karabiner's driver has to be activated. This is a Mac system-level setup that requires UI clicks Claude Code can't do.

Steps for Claude Desktop (computer-use)

  1. Open Karabiner-Elements (/Applications/Karabiner-Elements.app) — already running.
  2. At the top of the Karabiner-Elements main window, there's a banner saying something like:

    "Karabiner-DriverKit-VirtualHIDDevice is not activated" with a button labeled Install, Enable, or Activate.

  3. Click that button. macOS will: - Show a "System Extension Blocked" notification - Redirect to System Settings → Privacy & Security
  4. In System Settings → Privacy & Security, scroll to the bottom. There will be a row saying:

    "System software from application 'Karabiner-Elements' was blocked from loading" with an Allow button. Click it. Authenticate with password.

  5. Grant Input Monitoring permission: - System Settings → Privacy & Security → Input Monitoring - Add and enable: Karabiner-Elements, karabiner_grabber, karabiner_observer, karabiner_console_user_server
  6. Grant Accessibility permission: - System Settings → Privacy & Security → Accessibility - Add and enable the same Karabiner binaries
  7. Reboot the Mac. DriverKit extensions need a fresh boot to load cleanly.
  8. After reboot, verify in Terminal: bash pgrep -lf "karabiner_grabber" Should print the /Library/Application Support/org.pqrs/Karabiner-Elements/bin/karabiner_grabber path. If it does, the rule is live.

After Karabiner is working

  1. Karabiner config is already in place at ~/.config/karabiner/karabiner.json with the rule: json { "from": { "pointing_button": "button5" }, "to": [{ "key_code": "backslash", "modifiers": ["left_command"] }], "type": "basic" } No further config edits needed.

  2. Wispr Flow already has ⌘\ set as a Push-to-talk shortcut. No further Wispr edits needed.

  3. Re-enable Logi Options+ (it's currently killed): bash launchctl load /Library/LaunchAgents/com.logi.optionsplus.plist open -a "logioptionsplus"

  4. In Logi Options+, set the top front button (▲) to "Forward" (not Keyboard shortcut). This is critical — if Logi maps it to anything else, Logi will intercept the button before Karabiner sees it.

  5. Test: - Click into a text field - Press and HOLD the ▲ button on the MX Ergo - Wispr Flow should activate (overlay/indicator appears) - Speak, release, text should land

Files Eric should reference

Sources