Black Screen / Vertical tearing Skylake leap 42.2

I did a fresh install of leap 42.2 (i3 6100 and** no other graphics**)
install dvd booted to the installer but screen had vertical tearing
adding nomodeset to boot parameter fixed it though it was low res
this resulted in installer adding nomodeset to boot parameter

On booting installed system
1.default (nomodeset)

  • snd_hda_intel 0000:00:1f.3: failed to add i915 component master(-19)
  • boots to black screen (unable to login to plasma)
  • switching tty and killing x and startx results in icewm after delay (full res)

2.removing nomodeset

  • login screen comes (vertical tearing [black lines])
  • plasma is able to start but (vertical tearing [black lines])
  • icewm also has similar tearing now

3.adding i915.preliminary_hw_support=1

  • same as 1

I am totally confused (42.1 worked totally after 4.1-34 kernel)

never mind, an update seems to have fixed it