== History == Prior to nvidia 545 the driver did not provide a framebuffer and instead relied on framebuffers from CONFIG_EFI_FB and CONFIG_VESA_FB alike.
SimpleDRM (required on a modern Wayland-only system) can also provide a framebuffer (simplefb), and indeed Ubuntu does not use EFI_FB and VESA_FB anymore, relying purely on SimpleDRM to provide a fallback framebuffer. However SimpleDRM also provides a DRM device which creates this phantom display. Since nvidia 545, the driver has gained the capability to provide a framebuffer device, currently opt-in with the option `nvidia- drm.fbdev=1`. Enabling this makes SimpleDRM go away like it would with amdgpu or i915 (*currently racy, see [1]). == Solutions == 1. The first option is to enable fbdev=1 by default, like we do for nvidia-drm.modeset=1. This is still considered to be in test-stage by nvidia, and unfortunately on my Ubuntu machine it breaks any graphical session with bug [2]. NB: somehow this bug does not happen on my Fedora install, where fbdev=1 is already the default. 2. Prior to having the nvidia-drm.fbdev option in Fedora we would instead disable SimpleDRM if-and-only-if the nvidia driver is installed. You may achieve this either by appending `initcall_blacklist=simpledrm_platform_driver_init` to the kernel commandline through a package install-time script, or through a patch like [3]. But we are now left with no framebuffer device, so switching VT leaves you with a black screen (imho unacceptable). The solution to that issue is to enable CONFIG_EFI_FB/CONFIG_VESA_FB again so that nvidia systems will keep access to VTs, albeit low-res ones compared to simplefb. [1]: https://bugs.launchpad.net/ubuntu/+source/sddm/+bug/2063143 [2]: https://forums.developer.nvidia.com/t/545-29-06-18-1-flip-event-timeout-error-on-startup-shutdown-and-sometimes-suspend-wayland-unusable/274788 [3]: https://gitlab.com/cki-project/kernel-ark/-/merge_requests/1788/diffs -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2060268 Title: Phantom "Unknown Display" shown in Settings after installing the Nvidia driver To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2060268/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
