I’ve just updated to KDE 6.7, running latest Fedora workstation, KDE is alongside Gnome. On rebooting after update my second monitor is not seen. Connection is HDMI. I will check if Gnome sees 2nd monitor.
System details:
Operating System: Fedora Linux 44
KDE Plasma Version: 6.7.0
KDE Frameworks Version: 6.27.0
Qt Version: 6.11.1
Kernel Version: 7.0.12-201.fc44.x86_64 (64-bit)
Graphics Platform: Wayland
Processors: 12 × Intel® Core™ i7-10750H CPU @ 2.60GHz
Memory: 16 GiB of RAM (15.3 GiB usable)
Graphics Processor 1: Intel® UHD Graphics
Graphics Processor 2: NVIDIA GeForce RTX 2080 Super with Max-Q Design
Manufacturer: LENOVO
Product Name: 20UR000AUK
System Version: ThinkPad T15g Gen 1
Useing Intel graphics.
EDIT: I can confirm that my second monitor works when using Gnome.
Are you connecting the second monitor via a dock? If so, does that dock use DisplayLink?
If so, I am also experiencing this issue; for me, kwin is segfaulting when an external display is connected via DisplayLink on Fedora 44. This only started with Plasma 6.7, and I had to roll back to Plasma 6.6 to restore the functionality.
Just add that when I switch on the laptop my second monitor displays the Lenovo logo but after KDE login the second monitor is blank but fine on Gnome.
Perhaps DisplayLink is a red herring, and the issue is elsewhere in the monitor handling of Plasma 6.7. In both my situation and yours another monitor is being connected, and perhaps the connectivity of the monitor is irrelevant…
The possible similarity in both scenarios is the fact the display might not be wired directly to the compositing GPU. DisplayLink uses a virtual graphics card device to bypass some USB restrictions, and a laptop HDMI port might be directly wired to the dedicated GPU and not the integrated GPU.
Shooting in the dark, but there might be an issue with copies from the compositor to another GPU.
by a chance you has be using this command KWIN_DRM_DEVICES
Can be set to explicitly tell kwin_wayland which GPU(s) to use. The format is a colon-separated list, like this: /dev/dri/card1:/dev/dri/card0. As the card* file order is not stable, using the symlinks in /dev/dri/by-path is also supported, like this: KWIN_DRM_DEVICES="/dev/dri/by-path/pci-0000\:03\:00.0-card:/dev/dri/by-path/pci-0000\:59\:00.0-card" (note that the colons in the file name are escaped with \).
Hi Robin, I think this has to be a Plasma issue as I have been using the Intel graphics for a few years with no issue with KDE. As I mentioned above this is the Fedora workstation and Gnome has no issue with the second monitor although I do and much prefer KDE!