Comment 13 for bug 850895

From the plymouth debug log:

[./plugin.c] initialize_head:initializing 2048x1536 head

Those sure don't look like the dimensions we want. So this may be a bug with the resolution being handed off from grub, or it may be a bug in the nouveau framebuffer driver itself.

Another option you can try is to boot with the option 'plymouth:force-drm', which will cause plymouth to use the drm backend instead of the framebuffer backend. Note that this is not safe when running the system with dual monitors.