Plasma style broken (?) after upgrade to 6


Today gave in and decided to jump to Manjaro’s testing branch to test the very must awaited Plasma 6. The upgrade went well (I also upgraded from kernel 6.7 to 6.8) but upon rebooting, I immediately noticed the style appeared to be broken. SDDM was different than it was before (no borders, for example), and in normal plasma shell (wayland), a lot of padding, borders and highlights were missing, some widgets seemed to be outdated. Not sure what happened, but it’s definitely not normal.

Here are a couple of example screenshots:

(in this one, I have several of those programs opened, but they don’t look like it)

Any idea what might be causing this?

Thank you!

Remove you old plasma .config files. And cache.


It is virtually essential that you perform some cleanings before/during/after the big upgrade to 6.
As mentioned above.

Beyond that.
Depending on your theme … is it updated for 6?

Similarly, things changed in 6.
The desktop theme (plasma style) now has a lot less power.
The icons in your widgets for example no longer are derived from that plasma style, but from your icon theme.

I’m using regular breeze dark, so that should be good. The icons are also fine, it really is just the lack of padding, highlights, etc, as I mentioned. I will try clearing caches and configs, and see if it helps.

Thank you both so far!

Yes it should not look like that then.

I just checked breeze-dark and it has shadows.

I tried clearing caches (with rm) and configs (by moving to .baks), but the situation seems to persist. In fact, some things seem to have gotten worse hehe, like the task bar becoming way smaller, for some reason.

Any other ideas?


Does that also mean you ran kbuildsycoca6 --noincremental** and restarted ?

(I notice on Archwiki the old kbuildsycoca5 is listed)

The taskbar/panel size is editable too by the way. I found 30px sizes nicely here.

Does that also mean you ran kbuildsycoca6 --noincremental** and restarted ?

Yup, I even tried not doing that too, same result.

I found 30px sizes nicely here.

Interesting, it now defaulted to 30 but I find that way too small, 40/42 seems to be much better :stuck_out_tongue:

Maybe try a fresh new user then and see how that operates.

If still no dice … then I might ask for some system info. Maybe something is awry.

inxi -Farz
1 Like

Create a new user and test with it.

1 Like

I did the same thing last night and found, that a lot of settings are missing (gamma for example) and the whole themeing does not work yet in a lot of places.
I switched back to the stable branch (not downgrading packages) and to the X11 session.
There most of the things still work.

I guess it is to be expected, as testing packages are basically in sync with unstable.

I will either wait, for the issues to resolve as upgraded packages will come to stable eventually, or just might set up my system anew and take the lesson to make use of Timeshift in the future.

Then you didnt change anything on the running system.
(You changed the source of your packages … without changing any of the installed packages.
Your system is still on Plasma 6.)

Besides this.

To the issue at hand - Unless Testing Branch is in a particularly broken state that I am not aware of (running Unstable here) the ‘broken’ appearance is not the result of the state of the packages, but rather some error or incongruent of the existing configuration.

We still wait on OP to respond about the state of a fresh user :slight_smile:

I tried this, but the issue is still there:

inxi -Farz

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    wm: kwin_wayland tools: avail: swayidle,swaylock vt: 7 dm: SDDM
    Distro: Manjaro base: Arch Linux
  Type: Laptop System: SchenkerGmbH product: XMG FUSION 15 (XFU15L19)
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  API: EGL v: 1.5 hw: drv: intel iris platforms: device: 0 drv: iris
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  API: OpenGL v: 4.6 compat-v: 4.5 vendor: intel mesa v: 24.0.5-manjaro1.1
    glx-v: 1.4 direct-render: yes renderer: Mesa Intel UHD Graphics 630 (CFL
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  Device-1: Intel Cannon Lake PCH cAVS driver: snd_hda_intel v: kernel
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  Device-2: NVIDIA TU116 High Definition Audio vendor: Tongfang Hongkong
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  SMART Message: Unable to run smartctl. Root privileges required.
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  Packages: 4908 pm: pacman pkgs: 4890 libs: 668 tools: octopi,pamac,paru,yay
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    running-in: kitty inxi: 3.3.34

I’m aware, but thx for stating it clearly.

On the X11 session i had some issues to get it running in the first place, but once i resolved that it’s very minor stuff, like no Manjaro icon for the app launcher in my panel (just the KDE default).

Given also the gradient on the background of the widget …

I am beginning to wonder about your compositor.

This looks to me like a compsitor failing. (no transparency, missing shadows, etc)

But if you are using wayland … wayland is the compositor.

I suppose you can hop over to the X11 session for now.
And check that, as well as its compositor settings/availability/status.

I remember the KDE plasma 4 to 5 switch was flawless for me, because i didn’t used Virtual Desktop or Widget’s features… less features, less bugs.

I hope for KDE Plasma 6 the same, but im worried about wayland.
i just hope Manjaro will delay this update till KDE released more patches.

The truth is that Unstable branch is currently the most stable with Plasma 6.0.4, plus everything synchronized with Arch stable repo and compatible with AUR packages.

And use default KDE Breeze theme for Qt, GTK and SDDM, because Manjaro theme is broken.

The issues are also present on X, I forgot to mention, sorry!

@medmedin I believe I already am using Breeze for everything, but I will double check. I guess I could also try hopping to unstable.


I switched to unstable and did a sysupgrade. No differences, as far as I can tell. :confused:

Alright, this is a bit embarrassing… After all, it seems there was just something wrong with the installation. I reinstalled every plasma package through paru -S plasma and everything seems to be good now!

Thanks to everyone who chimed in!