[Bug 82439] [ivb regression] Dell Latitude 6430u failed to boot without nomodeset - since 3.16-rc5

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=82439

--- Comment #6 from Lv Zheng <lv.zheng at intel.com> ---
The first affection is:
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=1bb9e632a0aeee1121e652ee4dc80e5e6f14bcd2

commit 1bb9e632a0aeee1121e652ee4dc80e5e6f14bcd2
Author: Daniel Vetter <daniel.vetter at ffwll.ch>
Subject: drm/i915: Only unbind vgacon, not other console drivers

The console subsystem only provides a function to switch to a given
console, but we want to actually only switach away from vgacon.
Unconditionally switching to the dummy console resulted in switching
away from fbcon in multi-gpu setups when other gpu drivers are loaded
before i915.

Then either the reinitialization of fbcon when i915 registers its
fbdev emulation or the teardown of the fbcon driver killed the
machine. So only switch to the dummy console when it's required.

Kudos to Chris for the original idea, I've only refined it a bit to
still unregister vgacon even when it's currently unused.

This regression has been introduced in

commit a4de05268e674e8ed31df6348269e22d6c6a1803
Author: Daniel Vetter <daniel.vetter at ffwll.ch>
Date:   Thu Jun 5 16:20:46 2014 +0200

    drm/i915: Kick out vga console

Reported-and-tested-by: Ed Tomlinson <edt at aei.ca>
Cc: Chris Wilson <chris at chris-wilson.co.uk>
Cc: David Herrmann <dh.herrmann at gmail.com>
Reviewed-by: Chris Wilson <chris at chris-wilson.co.uk>
Reviewed-by: David Herrmann <dh.herrmann at gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>

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