The vboxvideo driver is missing a call to remove conflicting framebuffers.
Surprisingly, when using legacy BIOS booting this does not really cause any issues. But when using UEFI to boot the VM then plymouth will draw on both the efifb /dev/fb0 and /dev/drm/card0 (which has registered /dev/fb1 as fbdev emulation).
VirtualBox will actual display the output of both devices (I guess it is showing whatever was drawn last), this causes weird artifacts because of pitch issues in the efifb when the VM window is not sized at 1024x768 (the window will resize to its last size once the vboxvideo driver loads, changing the pitch).
Adding the missing drm_fb_helper_remove_conflicting_pci_framebuffers() call fixes this.
Cc: stable@vger.kernel.org Fixes: 2695eae1f6d3 ("drm/vboxvideo: Switch to generic fbdev emulation") Signed-off-by: Hans de Goede hdegoede@redhat.com --- drivers/gpu/drm/vboxvideo/vbox_drv.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/drivers/gpu/drm/vboxvideo/vbox_drv.c b/drivers/gpu/drm/vboxvideo/vbox_drv.c index 8512d970a09f..261255085918 100644 --- a/drivers/gpu/drm/vboxvideo/vbox_drv.c +++ b/drivers/gpu/drm/vboxvideo/vbox_drv.c @@ -76,6 +76,10 @@ static int vbox_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent) if (ret) goto err_mode_fini;
+ ret = drm_fb_helper_remove_conflicting_pci_framebuffers(pdev, "vboxvideodrmfb"); + if (ret) + goto err_irq_fini; + ret = drm_fbdev_generic_setup(&vbox->ddev, 32); if (ret) goto err_irq_fini;