[Bug 93987] [SKL] Screens fail to go into standby

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93987

--- Comment #10 from Norbert Varzariu <loomsen at gmail.com> ---
OK, even more weird: 
- with former working 4.3.5 kernel I get complete lockups when the screens have
been in standby for a while:
May 25 14:15:29 desktop kernel: [drm:check_wm_state [i915]] *ERROR* mismatch in
DDB state pipe B plane 1 (expected (0,0), found (446,884))
May 25 14:15:29 desktop kernel: [drm:check_wm_state [i915]] *ERROR* mismatch in
DDB state pipe B cursor (expected (0,0), found (884,892))

- with kernels 4.6-rc6 and later, which used to work kind of fine until just a
couple of days ago, it now fails consistently to go into standby.

- standby with those kernels as well as the latest fedora kernel works in GDM
when not logged in, but not after login.

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