Comment 56 for bug 1500751

Timo's suggestion in comment 54 resolves the issue with default ubuntu kernel:

 linux-image-3.19.0-30-generic 3.19.0-30.34
 linux-image-extra-3.19.0-30-generic 3.19.0-30.34

I applied the following change:

--- /usr/share/initramfs-tools/hooks/framebuffer.orig 2015-10-20 10:49:27.894272802 +0200
+++ /usr/share/initramfs-tools/hooks/framebuffer 2015-10-20 10:34:22.515012294 +0200
@@ -20,6 +20,7 @@

 copy_modules_dir kernel/drivers/char/agp
 copy_modules_dir kernel/drivers/gpu
+copy_modules_dir kernel/ubuntu/i915

 manual_add_modules fbcon
 manual_add_modules vesafb

And ran the command

 update-initramfs -k all -u

I have a Dell XPS 13 2015.