SUMMARY kwin 6.3.1 fails to start on a Fedora 42 installation with the NVIDIA driver: ``` kwin_core: Failed to open drm node: "" kwin_scene_opengl: couldn't find dev node for drm device kwin_scene_opengl: No render nodes have been found, falling back to primary node kwin_scene_opengl: 0x502: GL_INVALID_OPERATION error generated. <image> and <target> are incompatible kwin_wayland_drm: Failed to create framebuffer: Invalid argument kwin_wayland_drm: Failed to create framebuffer: Invalid argument ``` STEPS TO REPRODUCE 1. Install Fedora 42 2. Enable RPMfusion and install NVIDIA proprietary driver 3. Log in KDE Plasma OBSERVED RESULT Screen stays black. EXPECTED RESULT KDE session starts. SOFTWARE/OS VERSIONS Linux/KDE Plasma: KDE Plasma Version: 6.3.1-1.fc42.x86_64 KDE Frameworks Version: kf6-frameworkintegration-6.11.0-1.fc42.x86_64 Qt Version: 6.8.2-1.fc42.x86_64 ADDITIONAL INFORMATION GNOME Shell as a Wayland compositor works fine on that exact same setup. ``` s -l /dev/dri/ total 0 drwxr-xr-x. 2 root root 100 Feb 19 11:56 by-path crw-rw----+ 1 root video 226, 0 Feb 19 11:56 card0 crw-rw----+ 1 root video 226, 1 Feb 19 11:56 card1 crw-rw-rw-. 1 root render 226, 128 Feb 19 11:56 renderD128 ``` card0 is simpledrm and card1 is nvidia: ``` $ ls -l /sys/class/drm/card0/device/driver/ total 0 --w------- 1 root root 4096 Feb 19 12:15 bind lrwxrwxrwx 1 root root 0 Feb 19 12:15 simple-framebuffer.0 -> ../../../../devices/pci0000:51/0000:51:01.0/0000:52:00.0/simple-framebuffer.0 --w------- 1 root root 4096 Feb 19 2025 uevent --w------- 1 root root 4096 Feb 19 12:15 unbind $ ls -l /sys/class/drm/card1/device/driver/ total 0 lrwxrwxrwx 1 root root 0 Feb 19 12:15 0000:52:00.0 -> ../../../../devices/pci0000:51/0000:51:01.0/0000:52:00.0 --w------- 1 root root 4096 Feb 19 12:15 bind lrwxrwxrwx 1 root root 0 Feb 19 12:15 module -> ../../../../module/nvidia --w------- 1 root root 4096 Feb 19 12:15 new_id --w------- 1 root root 4096 Feb 19 12:15 remove_id --w------- 1 root root 4096 Feb 19 12:15 uevent --w------- 1 root root 4096 Feb 19 12:15 unbind ```
FWIW, it works in mutter because mutter uses the udev property `boot_vga` to select the device to use, see `meta_is_udev_device_boot_vga()`: https://gitlab.gnome.org/GNOME/mutter/-/blob/main/src/backends/meta-udev.c?ref_type=heads#L64-74
Did 6.2 work?
Actually, Austin Shafer from NVIDIA pointed at https://github.com/NVIDIA/open-gpu-kernel-modules/issues/788 as being the issue, basically, the NVIDIA driver does not enable the fbdev options with RC kernels as found in F42 at the moment.
FTR, If anyone else with the same problem comes across this bug report, a workaround suggested by Xaver is to set `KWIN_DRM_DEVICES` to point to the NVIDIA device, e.g.: ``` $ cat /etc/environment KWIN_DRM_DEVICES=/dev/dri/card1 ```
Hi - just to double-check on this one, is there still an issue to be tackled here for KWin? If so, are there updated steps to reproduce, since it sounds like perhaps the immediate issue when this bug was filed has since been resolved? Thanks!
🐛🧹 ⚠️ This bug has been in NEEDSINFO status with no change for at least 15 days. Please provide the requested information, then set the bug status to REPORTED. If there is no change for at least 30 days, it will be automatically closed as RESOLVED WORKSFORME. For more information about our bug triaging procedures, please read https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging. Thank you for helping us make KDE software even better for everyone!
The issue is presumably caused by the use on an RC kernel as Austin pointed out (comment #3). Dunno why that works with GNOME, maybe by chance, so please feel free to close this bug if you reckon this is not KDE.
🐛🧹 This bug has been in NEEDSINFO status with no change for at least 30 days. Closing as RESOLVED WORKSFORME.