Comment 19 for bug 1547204

I haven't run older Ubuntu on this machine.

Warnings don't happen with mainline kernel 4.2.0-040200-generic.

Upgrading BIOS (from 1.13 to 1.15) didn't help.

With mainline kernel 4.5: only two warnings: dmesg | grep "cut here" -A 1
[ 8.852365] ------------[ cut here ]------------
[ 8.852476] WARNING: CPU: 0 PID: 75 at /home/kernel/COD/linux/drivers/gpu/drm/i915/intel_fbdev.c:412 intel_fb_initial_config+0x2e4/0x600 [i915]()
--
[ 8.855788] ------------[ cut here ]------------
[ 8.855807] WARNING: CPU: 0 PID: 75 at /home/kernel/COD/linux/drivers/gpu/drm/drm_atomic_helper.c:715 drm_atomic_helper_update_legacy_modeset_state+0x26a/0x280 [drm_kms_helper]()