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[David Klasinc <bigwhale@xxxxxxxxxx>]

I think I found a reason why this happens.
I left xrandr running in a loop, logging everything and then I forced both displays into standby with xset.

After checking the logs this is what I noticed:

DP-0 connected primary 3840x2160+0+0 (normal left inverted right x axis y axis) 597mm x 336mm
DVI-D-0 connected 1920x1080+3840+0 (normal left inverted right x axis y axis) 510mm x 290mm
DP-0 connected primary 3840x2160+0+0 (normal left inverted right x axis y axis) 597mm x 336mm
DVI-D-0 connected 1920x1080+3840+0 (normal left inverted right x axis y axis) 510mm x 290mm
DP-0 disconnected (normal left inverted right x axis y axis)
DVI-D-0 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 510mm x 290mm
DP-0 connected primary 3840x2160+0+0 (normal left inverted right x axis y axis) 597mm x 336mm
DVI-D-0 connected 1920x1080+3840+0 (normal left inverted right x axis y axis) 510mm x 290mm
DP-0 connected primary 3840x2160+0+0 (normal left inverted right x axis y axis) 597mm x 336mm
DVI-D-0 connected 1920x1080+3840+0 (normal left inverted right x axis y axis) 510mm x 290mm

When displays go to low power mode my 4K screen is briefly turned off
and then back on. When 4K screen is turned off, the 1080p becomes
primary and and all the windows are moved to it, when screen is
connected back and windows are restored everything is put in the wrong
place.

This seems like a wrong implementation of DPMS with the screen
manufacturer, not much can be done about this, but WM could go around
this.

(strangely enough, same thing happens if I just turn off my HiDPI
screen, I don't know how I didn't remember this before)

Which brings up a separate problem - handling of windows when one screen
is turned off.

WM should remember position of windows when one screen is disconnected.
Windows should be then placed on the _visible_ area on the remaining
screen. When previous screen is connected again if windows were not
moved, they should go back to their original positions.

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https://bugs.launchpad.net/bugs/1295267

Title:
  Windows change Monitor/Desktop after screen lock

Status in Unity:
  Fix Released
Status in Unity 7.1 series:
  Fix Released
Status in compiz-plugins-main package in Ubuntu:
  Fix Released
Status in unity package in Ubuntu:
  Triaged

Bug description:
  I run a dual monitor configuration, with one portrait and one
  landscape.

  I nearly always have multiple applications open in multiple windows
  across both monitors and all virtual desktops.

  When I lock the screen and then unlock, my application windows will
  move from their original position.

  Sometimes they are in completely random positions;

  Other times they seem to get the monitors confused, and rather than
  being in the top half of the portrait monitor they are on the top half
  of the landscape monitor;

  Sometimes it is only a new desktop, but the monitor position is the
  same;

  Sometimes it is the same desktop, but on the other monitor.

  Description:	Ubuntu 13.10
  Release:	13.10

  What I expect to happen: When I unlock my computer, all the windows
  are in the same position on the same monitor and desktop as I left
  them.

  What actually happens: When I unlock my computer, some or all of the
  windows have been changed to a random position on a random monitor
  and/or desktop.

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