I finally dug a 4k monitors out and plugged it into my laptop. Of course, my laptop needs to use MST to drive it at 60Hz.
I got to fix version 2.24 of gtk+:
https://bugzilla.gnome.org/show_bug.cgi?id=759912
Next, I wanted to automatically configure things when I plugged and
unplugged the external monitor.
A long time ago, I wrote a simple C program that monitored randr events
and ran scripts when things changed; this moves the policy out of the C
program and into a "simple" shell script:
git://people.freedesktop.org/~keithp/x-on-resize.git
I'd had a workable shell script for a long time. I started trying to
hack that to also support MST configuration, but eventually decided to
abandon that and start over. I've added my new 'xrandr-auto' script to
the x-on-resize git repository. The MST monitor configuration bits are
general purpose, but there's a bit of policy about which monitor should
be primary, and how to lay monitors out in the screen.
This works for me; and can probably be hacked to work for others.
--
-keith
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