[Bug 48652] [IVB CPU eDP] local flat panel stays blank, workaround: intel_iommu=igfx_off

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=48652

--- Comment #113 from Oleksij Rempel <bug-track at fisher-privat.net> ---
After your comment i did some more tests -- just in case.
Enabled VT-d and removed intel_iommu=igfx_off line. Result is really
interesting:
I get oops only on second boot without igfx_off. First boot without igfx_off is
ok, both displays are working, but after power off and new start with same
configuration - without igfx_off kernel it will oops.

Other Zenbook had similar problem with suspend. After some suspend issue it
wasn't able to boot. Reason - memory corruption. May be some thing similar is
happening here. And some controller stay confused after power off with not
setted "intel_iommu=igfx_off".

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