uterm: drm: set VIDEO_HOTPLUG on wakeup

Be more verbose during wake-up and set VIDEO_HOTPLUG so we force the
hotplug-check. I don't know why it worked until now, but we definitely
need to force it as we have no idea what display-status changed.

Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
uterm: drm: force immediate modeset during wakeup

We need to call drmModeSetCrtc during wakeup to prepare for page-flips. An
immediate modeset is needed, otherwise we cannot be sure the FB/Crtc
configuration is still the same.

Force an immediate DRM modeset on wakeup to reset the screen.

Signed-off-by: David Herrmann <dh.herrmann@gmail.com>