Shutdown hang with Xid 56

Graphics / Linux Linux
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1

Specs

Relevant kernel args: rd.driver.blacklist=nouveau,nova_core modprobe.blacklist=nouveau rd.driver.pre=nvidia,nvidia_modeset,nvidia_uvm,nvidia_drm nvidia-drm.modeset=1 nvidia-drm.fbdev=1

Issue

Whenever I try to shutdown my computer, the system hangs with a black screen indefinitely, never fully shutting down unless I hold the power button or perform the alt-sysrq-REISUB sequence. However, if I boot into a TTY instead of graphical desktop and shutdown via systemctl poweroff, the shutdown completes normally, leading me to suspect a bug in nvidia-drm and/or its interaction with kwin/wayland. Over the past few months I’ve been searching online and trying various solutions & kernel args to no avail, leading me to post here.

Upon each reboot I check the kernel logs via journalctl -k -b -1 and find slight variations of this sequence at the end:

Apr 13 19:01:17 fedora kernel: Lockdown: systemd-logind: hibernation is restricted; see man kernel_lockdown.7
Apr 13 19:01:17 fedora kernel: NVRM: Xid (PCI:0000:08:00): 56, CMDre 00000000 00000200 00000001 00000005 00210031
Apr 13 19:01:20 fedora kernel: nvidia-modeset: WARNING: GPU:0: Lost display notification (0:0x00000000); continuing.
Apr 13 19:01:24 fedora kernel: [drm:nv_drm_atomic_commit [nvidia_drm]] *ERROR* [nvidia-drm] [GPU ID 0x00000800] Flip event timeout on head 0
Apr 13 19:01:27 fedora kernel: [drm:nv_drm_atomic_commit [nvidia_drm]] *ERROR* [nvidia-drm] [GPU ID 0x00000800] Flip event timeout on head 1

There’s an Xid 56 code here, which seems to be some kind of display error.

This happens consistently on every shutdown, though sometimes there are no nv_drm_atomic_commit errors, e.g. just:

Apr 04 19:45:44 fedora kernel: NVRM: GPU at PCI:0000:08:00: GPU-01806c90-3368-4bf5-d5a3-249917ad8c01
Apr 04 19:45:44 fedora kernel: NVRM: Xid (PCI:0000:08:00): 56, CMDre 00000000 00000200 00000001 00000005 00210031
Apr 04 19:45:47 fedora kernel: nvidia-modeset: WARNING: GPU:0: Lost display notification (0:0x00000000); continuing.
Apr 04 19:45:47 fedora kernel: kauditd_printk_skb: 82 callbacks suppressed

What I’ve tried so far

Various other kernel args that I found online. The only one that kind-of works is nvidia-drm.fbdev=0 but that causes stuttering, phantom display devices, and general instability on Wayland.

Switching between akmod-nvidia and akmod-nvidia-open has the same behavior.

While I have two displays, unplugging/disabling either of them before shutdown/reboot doesn’t change the overall behavior. It just removes the head 1 lines but not the head 0 ones.

Kernel arg initcall_blacklist=simpledrm_platform_driver_init causes it to hang on boot, same with env var KWIN_DRM_NO_AMS=1.

Attached some debug files. Thanks in advance!

journalctl.log (121.0 KB)

nvidia-bug-report.log.gz (499.2 KB)