Bug 509357

Summary: Message contents does not render on Wayland, X11 works
Product: [Applications] kmail2 Reporter: Lassi Väätämöinen <lassi.vaatamoinen>
Component: UIAssignee: kdepim bugs <pim-bugs-null>
Status: RESOLVED DUPLICATE    
Severity: normal    
Priority: NOR    
Version First Reported In: 6.5.0   
Target Milestone: ---   
Platform: openSUSE   
OS: Linux   
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:

Description Lassi Väätämöinen 2025-09-10 19:09:48 UTC 
SUMMARY
Message contents not rendered in the UI, but invisible text can be selected and copy-pasted or dragged. KMail UI does not render the contents, though

STEPS TO REPRODUCE
1. Open KMail
2. Click on a message in the list
3. Try to read message contents

OBSERVED RESULT
Nothing renders on screen.

EXPECTED RESULT
Message renders on screen.


SOFTWARE/OS VERSIONS
Operating System: openSUSE Tumbleweed 20250909
KDE Plasma Version: 6.4.4
KDE Frameworks Version: 6.17.0
Qt Version: 6.9.2
Kernel Version: 6.16.5-1-default (64-bit)
Graphics Platform: Wayland
Processors: 12 × AMD Ryzen 5 3600 6-Core Processor
Memory: 32 GiB of RAM (31,3 GiB usable)
Graphics Processor: AMD Radeon RX 580 Series
Manufacturer: Micro-Star International Co., Ltd.
Product Name: MS-7B79
System Version: 4.0

ADDITIONAL INFORMATION
Changing UI layout makes no change.

Starting Kmail from command line, I see the following:

lassi@kaappi:~> kmail
org.kde.pim.pimcommonactivities: Plasma activities is not running:  1
kf.windowsystem: KWindowInfo is only functional when running on X11
Backend texture is not a Vulkan texture.
Compositor returned null texture
Backend texture is not a Vulkan texture.
Compositor returned null texture
Backend texture is not a Vulkan texture.
Compositor returned null texture
Comment 1 Lassi Väätämöinen 2025-09-10 19:15:20 UTC 
Ok, something related to KMail mail renderer and Wayland. On X11 it works.
Comment 2 Lassi Väätämöinen 2025-09-10 19:18:03 UTC 
Also, this text gets printed in the console for each message I select from the list:

Compositor returned null texture
Backend texture is not a Vulkan texture.
Comment 3 Antonio Rojas 2025-09-10 19:58:52 UTC 

*** This bug has been marked as a duplicate of bug 508479 ***