HDMI trackpad: first swipe after a restart, and long two-finger presses (board)

Change: openspec/changes/the-hdmi-trackpad-survives-restarts-and-long-two-finger-presses. Evidence class for everything here: injected raw touch + shell/daemon log + grim. No finger touched the glass.

Method

tools/fake-touchscreen.py creates a uinput protocol-B touchscreen with the GT9895’s axis ranges. tools/trackpad-fake-run.sh starts a second k230-touch-trackpad instance (the installed binary, --device= pointed at the fake panel, --log-events). That exercises the real gate, relay, virtual touchpad, libinput, compositor and shell path. The service’s own instance keeps serving the real panel. Pointer placement used tools/board-pointer.py.

Before the fix (system 4ad02cm5… and earlier, 2026-10-15)

• 22:48:36: the operator’s first two-finger swipe after a live deployment logged k230-touch-trackpad: shell IPC phase=begin error=BrokenPipe and was dropped.
• A 1 s still two-finger press with the cursor on a widget produced no secondary click on page 1 or page 2. The daemon output a valid two-finger down and up, but with the source timestamps 1 s apart, which is past libinput’s tap timeout.

After the fix (system c2wxyv7h…, deployed live 2026-10-15)

1. Restart (with the first fixed daemon build, 4sr6kyyw…, which has the same IPC code): a fake-panel instance swiped, then systemctl restart shell.service restarted sway, then the same instance swiped again. Its log shows shell IPC phase=begin error=BrokenPipe followed by shell fingers=2 accepted=true, and first-swipe-after-sway-restart-page2-1280x800-grim.png shows Home on page 2.
2. Cursor on the Clock, hold2 0.6 0.3 1000 (two still fingers for 1 s): the shell logged home-widget-secondary-click and long-two-finger-press-clock-1280x800-grim.png shows rearrange mode.
3. Done, then swipe2 0.5 0.15 0.5 0.85 400 (accepted, Home to page 2), cursor on Weather, hold2 0.6 0.3 1000: home-widget-secondary-click, with the Weather badge visible in long-two-finger-press-page2-after-swipe-1280x800-grim.png.
4. Cursor on Done, one-finger tap: pointer-down, pointer-up, and rearrange mode closed.