Lexonight1/thermalright-trcc-linux v9.5.4 on GitHub

v9.5.4

LCD panel sleeps cleanly on shutdown / app close (#143 k1w3l, Elite Vision 360 SCSI). After the app exited, the panel stayed lit showing "USB communication lost" until VBUS dropped — Windows TRCC sleeps the panel, Linux didn't. Audit of the C# v2.1.4 source confirmed Windows sends nothing at shutdown; its USB stack just selective-suspends the device. Linux can't do the same because our udev rule pins power/autosuspend=-1 to keep frames flowing. The fix: a new trcc sleep chokepoint that re-enables autosuspend (writes auto → power/control) and unconfigures each matching USB device (writes 0 → bConfigurationValue) so the firmware sees a clean detach and powers down the panel. Wired through the GUI's aboutToQuit (catches close-button), the systemd service's ExecStop= (catches reboot/shutdown), and exposed as trcc sleep / POST /trcc/sleep for any remaining flows.

Platform.suspend_usb_device(vid, pid) -> bool — new capability port. Linux walks /sys/bus/usb/devices, matches on VID:PID (covers SCSI which has no UsbAddress and the multi-LCD case where two physical devices share VID:PID), writes the sysfs nodes, returns True on at least one success. Windows returns True no-op (USB stack handles it). macOS / BSD default to False until a reporter surfaces the need.
Trcc.suspend_all_devices() -> OpResult — single chokepoint for app shutdown. Collects unique (vid, pid) across LCD+LED registries, runs cleanup() and DeviceProtocolFactory.close_all() to release transports BEFORE writing bConfigurationValue=0 (avoids EBUSY), then asks the platform to suspend each pair. Idempotent.