November 16th, 2016 13:00

Solved. 

For those who run into the same issue.

After in-place upgrade to Ubuntu 16.10 the new driver works fine. I get full 3200 x 1800 resolution on external 4K monitor.

~$ sudo modinfo i915

filename:       /lib/modules/4.8.0-27-generic/kernel/drivers/gpu/drm/i915/i915.ko
license:        GPL and additional rights
description:    Intel Graphics
author:         Intel Corporation
author:         Tungsten Graphics, Inc.
firmware:       i915/bxt_dmc_ver1_07.bin
firmware:       i915/skl_dmc_ver1_26.bin
firmware:       i915/kbl_dmc_ver1_01.bin
firmware:       i915/kbl_guc_ver9_14.bin
firmware:       i915/bxt_guc_ver8_7.bin
firmware:       i915/skl_guc_ver6_1.bin
...
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