Fault-injection on-glass showed a killed/crashed WUDFHost leaves the devnode
"started" but HOSTLESS: PnP Status OK, no WUDFHost process, zero device-
interface instances — is_available() then fails every future session at the
vdisplay::open gate (and a reopen inside VdisplayDriver::open finds nothing),
until something cycles the device. Port reset-pf-vdisplay.ps1's adapter
disable→enable step in-process (restart_vdisplay_device): the open gate now
uses ensure_available() (cycle once + bounded re-probe; a genuinely
uninstalled driver — no adapter devnode — still fails fast), and
VdisplayDriver::open retries open_device over a short arrival window after a
cycle, covering the manager's reopen path too.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
enricobuehler
6f8fb15c9b