Bug 483203

Summary:	Window background color opacity incorrect in KiCad after upgrading from Plasma 5 Wayland to Plasma 6
Product:	[Plasma] kwin	Reporter:	Stefan Hamminga <stefan>
Component:	core	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	RESOLVED DOWNSTREAM
Severity:	normal	CC:	kde
Priority:	NOR	Keywords:	qt6
Version First Reported In:	6.0.1
Target Milestone:	---
Platform:	Arch Linux
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:
Attachments:	Screenshot of KiCad color theme preview, showing issue

Description Stefan Hamminga 2024-03-11 07:21:49 UTC

Created attachment 166936 [details]
Screenshot of KiCad color theme preview, showing issue

SUMMARY

After the regular Arch upgrades, which included Plasma 6, KiCad is unable to correctly set the window background color. The attachment shows the problem in action, where the preview background should be all black on the right (preview) panel, but is only tinted slightly (as if applying the chosen black color with 0.05 opacity or so). Changing the color does change the tint.

Discussion on this bug on the KiCad side is here:

https://gitlab.com/kicad/code/kicad/-/issues/17341

Both before and after the bug I was using Plasma with Wayland. The issue disappears when either (a) X11 is used (in Plasma 5 or 6) or (b) when forcing KiCad to use software rendering. Sadly KiCad's software rendering is _also_ broken on Plasma 6 (in different ways) so that's not a viable workaround.

KDE Plasma Version: 6.0.1
KDE Frameworks Version: 6.0.0
Qt Version: 6.6.2
Graphics: Mesa Intel UHD

Comment 1 David Edmundson 2024-03-11 09:34:54 UTC

The thread on kicad's gitlab looks like they agree it's client side.
Please reopen if there are any further developments that need our attention.