If I have screensaver set to “Yes” along with the option “Disable Missed Call Backlight” the screen saver works predictably well when the phone is idle.
However, I’d like the phone to wake back up whenever a BLF (monitored extension) goes into “in use” status. I tried turning on the feature “screensaver on if no active VPK” but unfortunately the result is that the screensaver becomes disabled permanently even if all the BLFs are idle for a very long time. The other VPK types in use are speed dial, transfer, and multicast paging.
I am inclined to report this as a bug because flipping the Screensaver setting back to “Yes” didn’t even get the screen saver working again. I had to reboot the phone to be able to get the screensaver working again after my attempt to use the “on if no active VPK” screensaver setting.