[plasmashell] [Bug 494804] With Qt 6.8 controls to log in or unlock screen are non-functional on some monitors when using the Breeze SDDM or Plasma theme ("TypeError: [thing] is not a function" error)

[jackdinn]

https://bugs.kde.org/show_bug.cgi?id=494804

jackdinn <jack at jackdinn.co.uk> changed:

           What    |Removed                     |Added
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                 CC|                            |jack at jackdinn.co.uk

--- Comment #89 from jackdinn <jack at jackdinn.co.uk> ---
I have tested with a brand new installation of manjaro KDE, fully up to date
and blank. but it now crashes plasma even just by issuing a `xrandr` command or
even a `inxi`, it also crashes plasma if i try to load pycharm.

I have been tearing my hair out on this one. I cant use my computer at all
without plasma crashing all the time.

GTP says
[quote]
That long log suggests that Plasma’s display management (via KScreen) is
receiving confusing or incomplete information about your monitor. In your case,
X reports that the HDMI-1 output is “disconnected” but still assigns it a
resolution and (more importantly) a physical size of 0 mm—which is not
realistic. When KScreen tries to use that data, it ends up crashing Plasma.
[/quote]

Things i have tried:

Reset KScreen Configuration:
    Renamed the folder ~/.local/share/kscreen to force Plasma to regenerate its
display settings.
    Result: Plasma still crashed, and xrandr reported HDMI‑1 with a 0 mm × 0 mm
size.

Xorg Configuration Tweaks:
    Created /etc/X11/xorg.conf.d/10-monitor.conf to force a correct physical
size, DPI, and preferred mode for HDMI‑1:
        Added settings like DisplaySize 344 194, Option "DPI" "96 x 96", and
Option "PreferredMode" "3840x2160".
    Expanded the file to include a Screen section with a forced mode.
    Result: xrandr still showed HDMI‑1 with 0 mm dimensions, and Plasma
continued to crash when display commands (like xrandr or inxi) were run.

Disabling KScreen Autostart:
    Tried overriding KScreen’s autostart by creating a user-level autostart
file (~/.config/autostart/org.kde.kscreen.desktop) with Hidden=true.
    Also added [Module-KScreen] autoload=false to ~/.config/kded5rc.
    Result: Neither method prevented KScreen from launching—Plasma still
crashed.

Forcing X to Ignore EDID:
    Updated the Xorg config to include Option "UseEDID" "false" in the Monitor
section.
    Result: This did not change the reported 0 mm physical size, and Plasma
still crashed.

Additional Considerations:
    We also discussed switching to another desktop environment or Wayland, or
downgrading Plasma/the kernel, but these were not acceptable due to personal
preferences and hardware issues (e.g., trackpad non-functionality on Wayland).

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