Arch Linux

This was attempted see  FS#72645 

It is a nice feature have a decent failsafe option for Wayland and Xorg (https://gitlab.freedesktop.org/xorg/xserver/-/commit/b89fdd523e2c9e9b0cdf37b263833c4b0a8868b8).

They will go even further in Fedora 39:

https://fedoraproject.org/wiki/Changes/LegacyXorgDriverRemoval

What a shame NVIDIA.

https://github.com/negativo17/nvidia-driver/issues/129#issuecomment-1445376122
https://bugzilla.redhat.com/show_bug.cgi?id=2161104#c83

525 nvidia driver (both open and closed) now support simpledrm?

This is still broken with 525, see  FS#77603 .

 FS#77603  was with 525.89.02.

525.105.17 release notes:

"Added support for console restoration when using simpledrm."

https://www.nvidia.com/download/driverResults.aspx/202504/

Who knows...

Setting CONFIG_SYSFB_SIMPLEFB=y (*keeping* CONFIG_FB_EFI=y, CONFIG_FB_VESA=y) and carrying this patch downstream would be too much?

https://gitlab.com/cki-project/kernel-ark/-/commit/811fe0e4dcfd86a0db5135d3bfef4936794efdb6
(buried here: https://src.fedoraproject.org/rpms/kernel/blob/f38/f/patch-6.4-redhat.patch )

I'll consider it.

linux 6.4.8.arch1-1 has the patch and the config enabled.

Working fine on Intel hardware. Anyone with Nvidia drivers? (nvidia-drm.modeset=1 cmdline is required)

Should this be implemented in linux-lts too?

> Anyone with Nvidia drivers? (nvidia-drm.modeset=1 cmdline is required)

@marcosfrm, please see  FS#79306  (even though it looks like a hyprland crash, maybe this kernel config option is the cause?). Any comments?

If nvidia-drm.modeset=1 is set, kernel should behave as before (CONFIG_SYSFB_SIMPLEFB not set). From the reports I have seen, without the patch VTs would simply not work.

> Anyone with Nvidia drivers? (nvidia-drm.modeset=1 cmdline is required)
After upgrading my kernel from 6.4.7.arch1-3 to 6.4.8.arch1-1 and 6.4.9.arch1 GDM cannot start Wayland nor X anymore due to segfault (see attachment)

I do not have nvidia-drm.modeset=1 in kernel cmdline, but do in /etc/modprobe.d/nvidia-drm.conf:
➜ cat /etc/modprobe.d/nvidia-drm.conf
options nvidia_drm modeset=1

I tried to add nvidia modules to initrd and move nvidia_drm modeset=1 to kernel cmdline, but got no effect
When using 6.4.7.arch1-3 kernel I'm able to run both X and Wayland sessions:
➜ echo $XDG_SESSION_TYPE
wayland

Can you post /proc/cmdline contents?

I checked /proc/cmdline and found a misconfiguration. I added nvidia-drm.modeset=1 kernel option to wrong config, so it was not applied.
With nvidia-drm.modeset=1 in kernel cmdline, even without nvidia modules in initrd, X/Wayland starts normally.
If nvidia-drm.modeset=1 kernel options is absent, nvidia driver starts to segfault even if modeset is enabled using /etc/modprobe.d/.

My current cmdline is "init=/usr/lib/systemd/systemd quiet loglevel=3 rd.systemd.show_status=auto rd.udev.log_priority=3 modules-load=nvidia nvidia-drm.modeset=1"
My misconfigured cmdline was "init=/usr/lib/systemd/systemd quiet loglevel=3 rd.systemd.show_status=auto rd.udev.log_priority=3 modules-load=nvidia"

> With nvidia-drm.modeset=1 in kernel cmdline, even without nvidia modules in initrd, X/Wayland starts normally.

Great.

We should mention in the Wiki nvidia-drm.modeset=1 is required now. Btw, the option is wrong there:

https://wiki.archlinux.org/title/NVIDIA#DRM_kernel_mode_setting

as a Arch and Hyprland user (not an experienced Arch user as you all), I just updated linux 6.4.9 and uncommented an environment variable before launching Hyprland and it worked.
# env = GBM_BACKEND,nvidia-drm
(which was set in hyprland.conf) (this could have been set .bashrc/.bash_profile)

I also have
> cat /etc/modprobe.d/nvidia.conf
options nvidia_drm modeset=1

Also have this
> cat /proc/cmdline
BOOT_IMAGE=/vmlinuz-linux root=UUID=223628a8-299a-4e2b-84b8-e6ea139ffa49 rw loglevel=3 quiet

I did not have the GRUB_CMDLINE_DEFAULT option set.
Although Hyprland updated wiki has the kernel command line option as ;
"...
For people using systemd-boot you can do this adding nvidia_drm.modeset=1 to the end of /boot/loader/entries/arch.conf. For people using grub you can do this by adding nvidia_drm.modeset=1 to the end of GRUB_CMDLINE_LINUX_DEFAULT= in /etc/default/grub, then run # grub-mkconfig -o /boot/grub/grub.cfg
..."
I thought this might help too.

The kernel command line option is nvidia-drm.modeset=1, not nvidia_drm.modeset=1.

@salimp2009 starting with 6.4.8.arch1-1 and 6.4.8.zen1-1, if you do not set nvidia-drm.modeset=1, simpledrm *will* activate. Nvidia added some code to support it in 525 branch with mixed success reports. Maybe it is working for you...

Btw, openSUSE kernels have the same patch.

ok. sorry for the typo. I have nvidia-drm modeset=1 in nvidia.conf
So I guess misunderstood prev comment about nvidia-drm.modeset=1 is needed in kernel cmdline

Sorry, I was wrong. Actually the driver accepts both nvidia-drm.modeset=1 and nvidia_drm.modeset=1 since it uses module_param_named():

https://github.com/NVIDIA/open-gpu-kernel-modules/blob/535.98/kernel-open/nvidia-drm/nvidia-drm-linux.c#L46

Fedora patch uses early_param() therefore will work with both. Hence the Wiki is ok.