Problem was that vesafb.c moved from drivers/video to drivers/video/fbdev which caused the patch no longer to apply. So it was accidentally dropped at some point between Vivid and now. The Trusty patch was:
commit 24924c740ea3c5c15a27f391171fad2ca93582a2 Author: Stefan Bader <email address hidden> Date: Tue Apr 21 14:54:52 2015 +0200
UBUNTU: SAUCE: vesafb: Set mtrr:3 (write-combining) as default
Problem was that vesafb.c moved from drivers/video to drivers/video/fbdev which caused the patch no longer to apply. So it was accidentally dropped at some point between Vivid and now. The Trusty patch was:
commit 24924c740ea3c5c 15a27f391171fad 2ca93582a2
Author: Stefan Bader <email address hidden>
Date: Tue Apr 21 14:54:52 2015 +0200
UBUNTU: SAUCE: vesafb: Set mtrr:3 (write-combining) as default