SetPortFeature(PORT_INDICATOR) was issued unconditionally for every
connected+enabled port. QEMU's usb-hub does not advertise indicator
support and NAKs the request indefinitely; with no control-transfer
timeout the daemon hung before the post-enable debounce, so devices
behind the hub never attached. Gate on wHubCharacteristics bit 7
(HUB_CHAR_PORTIND, USB 2.0 Table 11-13), matching Linux hub_configure's
has_indicators check.
Red Bear OS
0e948dd2a7