Google says `DRM_IOCTL_MODE_CREATE_DUMB failed` messages are a bug in 
webkit2gtk that is fixed in a newer version (4.0-41 googling webkit bugzilla), 
so I guess you may need to wait for that to get into your distro.  
Interestingly it works here with 4.0-37 but on Cinnamon not KDE.

Just to confirm those messages are from markdown, first launch Geany from the 
command line with default configuration by `geany -c /tmp/does_not_exist` and 
see what messages show, then enable only the markdown plugin and see what 
messages show[^1], then open a markdown file and see that the 
`DRM_IOCTL_MODE_CREATE_DUMB` messages show.

Also you could see if the webhelper plugin has the same issues, it uses 
webkit2gtk as well.

[^1]: ignore the raft of messages when the plugin manager is opened, they are 
harmless and due to GTK ignoring its own stability guarantees.

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