While the YUV icon is displayed, the screen will not go to power saver even if the Video Blanking interval option is set.

Reference: CR 12240490

A user who creates two Linux sessions cannot create a screen lock for the second session. When Sun Ray Software needs to lock the screen, it uses xlock for the second session. When the user tries to lock the screen from the menu, nothing happens. The workaround is to start a screensaver daemon for the second session manually, to enable screen locking and stop Sun Ray Software from using xlock.

# /usr/X11R6/bin/xscreensaver -nosplash &