https://bugs.kde.org/show_bug.cgi?id=437824
Bug ID: 437824
Summary: Chronic display configuration amnesia
Product: kwin
Version: 5.21.5
Platform: Other
OS: Linux
Status: REPORTED
Severity: major
Priority: NOR
Component: multi-screen
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
Since Kwin naively ties basic desktop configs to overly-specific and fragile
"display setups" (how exactly these setups are "auto-detected" internally I
have no idea but it's a pretty fragile process that can be easily thrown off
course). Thus KDE constantly "forgets" which monitor should use which settings,
with predictably catastrophic results.
And I only have two monitors - laptop and external. I only use one display at a
time. It's the simplest possible configuration involving more than one monitor
(dual monitors carry show-stoppers of their own - namely all windows moving to
the left-most display when it's plugged in, ).
Here are a couple examples of how can break:
1. The wrong display gets often gets "disabled" on wake, requiring manual
intervention to enable the external display every time and disable the laptop.
2. Often, the sole existing display is disabled on wake. Thus you must either
track down your secondary monitor and plug it in, or reboot the machine.
3. It is essentially impossible to change the wallpaper permanently. Wallpaper
change isn't respected even on the *sole primary display.* Whenever KDE
"forgets" the display (it thinks the assembly has changed for some reason), it
applies the previous wallpaper.
4. Panels would probably suffer from the same problems as the wallpaper, though
I can't test this because I use latte dock - which is tied to display hardware
name and always respects the primary display.
It seems that the source of this amnesia is two fold:
1. (plasma) The expectation that each unique "display setup" can have a totally
unique plasma config for each display within that "setup", and other
configurations in other setups. The number of unique setups is of course
infinite.
2. (kwin) The over-specification of "display setups" - KDE tries to find an
exact match for the setup and predictably fails.
These problems wouldn't arise if the architecture was based on the concept of
primary and secondary monitors (only two distinct classes) instead of infinite
unique "setups," each with its own set of unique per-display configs.
I know these are general architectural issues and don't expect a fix too soon.
But are these problems at least recognized as such? KDE is the only desktop
that can be rendered inoperable by the existence of multiple displays, but I
don't see any recognition of this fact.
Possibly related https://bugs.kde.org/show_bug.cgi?id=292419
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