[Bug 100755] [HSW] linux next-20170407+ boots to a blank screen

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100755

--- Comment #4 from Dhinakaran Pandiyan <dhinakaran.pandiyan at intel.com> ---
(In reply to Rafael Ristovski from comment #0)
> Created attachment 130972 [details]
> next-20170324 with fastboot=1, shows suspend/resume, works fine
> 
> Ever since next-20170407 (last good next-20170324, versions in-between not
> tested) my laptops screen stopped turning on after resuming. 
> Upon removing i915.fastboot=1 from cmdline, the display now turns off
> immediately after boot, which means enabling fastboot only covered up the
> real issue.
> 
> HW:
> i7-4500U Haswell with HD 4400

I think you are right, fastboot adjusts the m_n values, which might explain why
it worked with fastboot=1. I have attached the revert for you test. Please let
me know if that works.

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