Terribly strange problem that just cropped up w/o any hardware changes (or software that I'm aware of.)
Dell E5520 Laptop (i5, on-board video) f/ FHD (1920x1080) 17" screen.
Use with Dell docking station and two monitors at home.
Monitor 1 - HP LP2465 (16:10) set as 1200x1920 (portrait) <== this is the problematic one
Monitor 2 - Acer 24" 1920x1080
Monitor 1 is the one that has the issue.
Set up is that in dock laptop's native display is off (in windows it's mirrored with the HP, Monitor 1) and desktop extended to the Acer (Monitor 2)
This worked well for the last 3 or so weeks (since I've added the HP - a new-to-me but 2nd hand monitor) and then suddenly a few days ago I started getting weird behaviors when I maximize a window on the HP - I get a flickering "vertical" line (vertical as the monitor is set to portrait) or sometimes I'll get a bunch of blue dots (similar to what you see in some screen tearing issues) or the monitor will just go blank for about 2 seconds and then come back on. It will repeat this on and off, sometimes ending in just off.
I've never seen this behavior, it only happens when I maximize a window. If I size the window to damn near maximized it doesn't do it but as soon as I maximize it does. If I "restore" the window while it's happening, it stops.
And to make it stranger, if I maximize a window that's predominantly black (I have a time keeping app with a dark theme) then the monitor does NOT flicker.
Not sure where to look. Could it be hardware? What could fail in a monitor that would make it ONLY turn of in a maximized white window?
Software - I haven't changed any refresh rates since when it was working for the 3 weeks prior and haven't changed any softwares (save for Windows Updates but I don't think the vid driver's been touched) from when it was working to now.
At a loss to explain this. Would really appreciate some insight as to wth is going on, how to troubleshoot and (hopefully) resolve.
Edited by hamluis, 29 November 2017 - 03:20 PM.
Movedx from Win 7 to Internal Hardware - Hamluis.