[Bug 216277] New: X11 doesn't wait for amdgpu driver to be up

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=216277

            Bug ID: 216277
           Summary: X11 doesn't wait for amdgpu driver to be up
           Product: Drivers
           Version: 2.5
    Kernel Version: 5.18.11+
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri@kernel-bugs.osdl.org
          Reporter: dark_sylinc@yahoo.com.ar
        Regression: No

# Context

I'm using Xubuntu 20.04
I compiled Kernel 5.18.11+ myself (shows bug)
I compiled Kernel 5.13.7+ myself (does not show bug)
My GPU is AMD Radeon 6800 XT 16GB, I don't have an iGPU (CPU is Ryzen 5900X)

Mesa is:

OpenGL renderer string: AMD Radeon RX 6800 XT (sienna_cichlid, LLVM 14.0.1, DRM
3.46, 5.18.11+)
OpenGL core profile version string: 4.6 (Core Profile) Mesa 22.0.5 - kisak-mesa
PPA
OpenGL core profile shading language version string: 4.60


# Steps to reproduce

1. Turn on the PC
2. On *some* occasions X11 will crash, taking down the keyboard; leaving the
computer in a seemingly frozen state while displaying tty with the last info
messages
3. As a workaround, I can login via ssh and type `sudo service lightdm restart`
and the X11 server will start and everything starts working perfectly fine

# Diagnostic

It seems X11 doesn't wait for amdgpu to be up. This can be seen by checking
/var/log/Xorg.0.log (attached):

[     7.718] (II) modesetting: Driver for Modesetting Kernel Drivers: kms
[     7.718] (II) FBDEV: driver for framebuffer: fbdev
[     7.718] (II) VESA: driver for VESA chipsets: vesa
[     7.718] (WW) xf86OpenConsole: setpgid failed: Operation not permitted
[     7.718] (WW) xf86OpenConsole: setsid failed: Operation not permitted
[     7.719] (EE) open /dev/dri/card0: No such file or directory
[     7.719] (WW) Falling back to old probe method for modesetting
[     7.719] (EE) open /dev/dri/card0: No such file or directory

Visually speaking, I *think* that X11 tries to init while tty is still in VESA
mode before/during switching to 1920x1080

AFAIK, systemd is responsible for waiting the GPU drivers are up. Does anybody
know where I should look? Does systemd need an update? Could this be a libDRM
issue? I currently have installed 2.4.110 in /usr/lib and libdrm 2.4.111
compiled from source in /usr/local/lib

I could try bisecting but unfortunately the reproducibility isn't "always"
which makes it hard to debug.

All of this has been working fine with Kernel 5.13.7+

Cheers

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