Nick Coghlan posted on Fri, 15 Apr 2016 11:59:16 +1000 as excerpted:
> P.S. I know the underlying multiple monitor support in X11 is pretty
> terrible, so it wouldn't shock me to learn that this won't be 100%
> reliable until after Wayland is usable as the default display server :)
On my setup it shouldn't be so hard, regardless of what order the
monitors enumerate in when coming back from monitor power-down, etc.
1) I have the exact same hardware configured in the same layout the
entire time.
2) The layout configuration is in xorg.conf. That directory and the
files inside are readable by all, so if kde/plasma has a problem getting
it right, all they have to do is use the xorg.conf configuration.
3) Xorg/kwin apparently gets it right, as the pointer still moves from
monitor to correct monitor upon hitting the expected edge of the first.
Given that the xorg pointer remains correct, xorg's view of the situation
remains correct. It's only plasma that can't figure things out, with
krunner appearing offscreen until restarted, panels appearing on the
wrong monitor/randr-screen, and activities as well deciding they want to
switch monitors.
If xorg has it correct, as it does because the pointer still moves
correctly between monitors, then xorg screen and randr screen coordinates
must still be correct.
And other windows, including the ones set to specific coordinates by kwin
window rules, go to the correct location.
It's only plasma and krunner that continue to get things so spectacularly
wrong.
Why I don't know, but it can't be blamed on xorg when only plasma and
krunner have the problem, everything else works as expected.
Indeed, to the extent that plasma sets distinct window properties so I
can, I'm able to set window rules for it as well, and the windows then
behave according to those rules. Unfortunately, plasma sets the same
title and class properties on a whole bunch of unrelated windows and
apparently no longer sets window role at all, so that doesn't work as it
should, either. =:^(
--
Duncan - List replies preferred. No HTML msgs.
"Every nonfree program has a lord, a master --
and if you use the program, he is your master." Richard Stallman
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