[Bug 91952] [Bisected Regression] Blank screen from boot until any input on X

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91952

--- Comment #14 from Maarten Lankhorst <bugs at mblankhorst.nl> ---
Created attachment 118324
  --> https://bugs.freedesktop.org/attachment.cgi?id=118324&action=edit
Only disable planes that are potentially enabled.

Ok one thing I did notice:
[    0.000000] efi: No EFI runtime due to 32/64-bit mismatch with kernel

You're using a 32-bits kernel with 64-bits efi runtime. Not harmful in itself
probably. Could check if it goes away with noefi though..

Taking a closer looks at the reverts:

There appears to be a bug in the plane disable code where the call
intel_disable_primary_hw_plane does nothing.

This isn't noticed because the primary plane gets disabled through
intel_disable_sprite_planes.

I'm guessing the attached patch might solve the issue too.

Can you check?

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