On Sat, Jun 16, 2018 at 6:16 AM Pawel Veselov wrote:
Hello.
There are a couple of things that's been annoying me in KDE for a
while, and I'd like to poke around and understand how I can help
making them any better.
1. Which is not as bad, but still, is the screen power. It seems to
randomly not work, i.e. leave the power on despite the settings to
turn it off. It may work with one external monitor, but not another,
may not work at all, may only shut off one monitor, but not both.
2. Switching monitors. There seems to be some support to remember what
last monitor was connected (I carry my laptop between home and work,
where different monitors, and arrangement is used), and what the
configuration with that monitor was, but it often seems to not work,
and do more harm than good (i.e. I'd rather configure it from scratch,
rather have it "help" me restore the last state). Before the latest
update, I only had to regularly deal with having to reconfigure the
monitor - including resolution, position (mostly), and primary flags.
But now, I also regularly see cases when the system recognizes one
monitor as connected (the monitor arrangement shows NEC, for example),
but the options are applied to a different monitor (for example,
Samsung). So the multi-screen configuration engages, but the monitor
that is connected doesn't show anything.
Recently (I think in Plasma 5.13), there's been some improvements in this area to apply the right configuration to the right display. The issue probably occurs due to inconsistent/confusing EDID information of the display/monitor.
These things are hard to reproduce, and even convert into a bug
description. I'd like to at least set up some debugging going on, and
look at the code, to understand what is what. I mean, after all, the
problem may be in my own configuration, but it's not at all obvious.
Well, I'm new to KDE all together, and all in all, the connectivity
and the components involved in modern Linux desktop software stack,
are a bit of a mystery to me. If there are some resources that I can
go over, to understand the architecture of how, say, the monitor power
saving is done, or the multi-screen configuration is applied, it'd be
helpful. I mean, at least name of the involved modules, and how they
communicate with each other.
The relevant components are libkscreen (https://cgit.kde.org/libkscreen.git) and KScreen (https://cgit.kde.org/kscreen.git) and you may have better chance contacting the KDE Plasma development mailing list (https://mail.kde.org/mailman/listinfo/plasma-devel) or Phabricator (https://phabricator.kde.org/).
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