Please check this: https://insights.club-3d.com/thread/how-i-got-4k-60hz-working-with-intel-graphics/

Also i have feedback  from many users who have it working on Skylake HD520/530/540 graphics, so that should certainly not be an issue. With HD6000 it is a bit more tricky, but as you can see on the above link, this user has it working even on a HD4600 …