[BUG] linux driver fails to remove framebuffer device when HDMI cable plugged out

Graphics / Linux Linux
2

I have the exact same issue with intel12 and nvidia 3080 ti on a advanced optimus laptop.

I first thought it was an issue from Aquamarine (AQ), the Wayland backend used by Hyprland, but i can reproduce the issue without a graphical environment as well.


  # enable finegrained power management
  boot.extraModprobeConfig = ''
    options nvidia NVreg_EnableGpuFirmware=0 NVreg_DynamicPowerManagementVideoMemoryThreshold=0 NVreg_DynamicPowerManagement=0x02 NVreg_UsePageAttributeTable=1 NVreg_InitializeSystemMemoryAllocations=0 NVreg_PreserveVideoMemoryAllocations=1
    options nvidia-drm modeset=1 fbdev=1
  '';

  boot.kernelParams = ["nvidia-drm.modeset=1" "nvidia.NVreg_EnableGpuFirmware=0" "nvidia.NVreg_DynamicPowerManagementVideoMemoryThreshold=0" "nvidia.NVreg_DynamicPowerManagement=0x02" "nvidia.NVreg_UsePageAttributeTable=1" "nvidia.NVreg_InitializeSystemMemoryAllocations=0" "nvidia.NVreg_PreserveVideoMemoryAllocations=1"];

Maybe it is possible to manipulate the nvidia driver from the udev rules as a workaround

The issue also happen on the open driver

After a clean boot sudo cat /sys/kernel/debug/dri/129/framebuffer is empty
After plugging the external monitor, it contains

framebuffer[115]:
	allocated by = [fbcon]
	refcount=1
	format=XR24 little-endian (0x34325258)
	modifier=0x0
	size=1920x1080
	layers:
		size[0]=1920x1080
		pitch[0]=7680
		offset[0]=0
		obj[0]:
			name=0
			refcount=2
			start=00100000
			size=8294400
			imported=no

along with my wm processes framebuffers.

After unplugging, the other framebuffers are cleaned up, but fbcon allocation remains

Maybe it is related to

EDIT: issue created at RTD3 dont allow gpu to sleep after a monitor has been plugged and unplugged on prime reverse sync · Issue #759 · NVIDIA/open-gpu-kernel-modules · GitHub

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