Hunting Down Who A Monitor (or Sometimes Two) Goes Blank

I am running Slackware 14 with three screens, using KDE.

The issue I have is that all three display ports seem properly configured, and have worked for a couple of years, and all of the sudden the last several days, mid-day, something happens and one or more screens go blank.

Looking at messages and syslog, I don't see anything unusual. Can someone point me in the right direction towards figuring this out?


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