Unbind AMD GPU without restarting the display manager
Solution 1:
Technically it is possible. However, AMD didn't implement it for Linux.
static void
amdgpu_pci_remove(struct pci_dev *pdev)
{
struct drm_device *dev = pci_get_drvdata(pdev);
#ifdef MODULE
if (THIS_MODULE->state != MODULE_STATE_GOING)
#endif
DRM_ERROR("Hotplug removal is not supported\n");
drm_dev_unplug(dev);
amdgpu_driver_unload_kms(dev);
pci_disable_device(pdev);
pci_set_drvdata(pdev, NULL);
drm_dev_put(dev);
}
Source: https://cgit.freedesktop.org/~agd5f/linux/tree/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c?h=drm-next-5.7