[SOLVED] KDE Plasma 5: Windows can not be moved off screen

c00l.wave · Apprentice Joined: 24 Aug 2003 Posts: 268

I'm used to freely move my windows around using Alt/Meta + Drag in KDE Plasma 5 and I am pretty sure I was able to move them out the top and left edges of my screen. Somehow, after a recent update (or some configuration change that I'm not aware of), that's no longer possible. I can only move them out to the right or bottom but they get stuck when the top-left window corner hits the top/left screen edges.

Does anyone know what changed and how I can restore the old behaviour?
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asturm · Developer Joined: 05 Apr 2007 Posts: 9259

https://bugs.kde.org/show_bug.cgi?id=469426

c00l.wave · Apprentice Joined: 24 Aug 2003 Posts: 268

Thanks; sounds like it's some difference between target architectures in GCC? I've changed from an old Intel i7 to a modern Ryzen and as part of profile changes recompiled the entire system with -march=znver4 recently which in the bug comments is suspected to cause that (and potentially other) issues through AVX512 instructions.

Is there some way to define a different -mtune GCC flag per ebuild to only (and always) compile kwin/Plasma without those AVX instructions as a workaround? It's unlikely that there will be any bugfix for Plasma 5 as it is EOL (but I have doubts that Plasma 6 is already equal to Plasma 5 in terms of features and usability, having gone through all the previous KDE major releases).

Edit: Found it: https://wiki.gentoo.org/wiki//etc/portage/package.env#Use_different_MAKEOPTS_for_a_specific_package

1. create a .conf suffixed file in /etc/portage/env/ to hold the override (both CFLAGS and CXXFLAGS, variable substitution works)
2. refer the package to that env file in /etc/portage/package.env (which is a file, not a directory)

In my case:

Chiitoo · Posted: Sun Jun 30, 2024 2:27 pm Post subject:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110260
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sam_ · Developer Joined: 14 Aug 2020 Posts: 1946

Really, I'd say it's the KDE bugs https://bugs.kde.org/show_bug.cgi?id=469426 and https://bugs.kde.org/show_bug.cgi?id=460572.

The GCC bug you filed could easily be a mix of different things and some testcase would ideally be had. I haven't yet hit it myself but I do now have more AVX512 HW...

Chiitoo · Posted: Sun Jun 30, 2024 3:23 pm Post subject:

Probably yeah.

I haven't actually tried with kwin:6 yet, to see if I still need to disable it.

Will try later today.

Edit:

From a quick emerge and 'kwin_x11 --replace &' looks like not needed any longer hmmm.

I'm also using GCC 14 already, though not sure if relevant.
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c00l.wave · Apprentice Joined: 24 Aug 2003 Posts: 268

sam_ · Developer Joined: 14 Aug 2020 Posts: 1946