[Bug 90039] black screen, X not starting since kernel >=3.15 with Haswell-ULT

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90039

--- Comment #21 from Chris Wilson <chris at chris-wilson.co.uk> ---
(In reply to Ander Conselvan de Oliveira from comment #18)
> Looking at your dmesg, it seems X turns off all CRTCs (which is normal
> behavior).  The odd part is that after that no CRTCs are turned on.

It's not X that is turning them off, the kernel reports all outputs as unknown
status, including the one currently active.

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