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From: Andreas Noever <andreas.noever@gmail.com>
Date: Tue, 19 Aug 2014 17:45:00 +0200
Message-ID: <CAMxnaaWQoX9KMQVCKHTkeqSxGEybz5u1qU6AVBqzW3+mj_nJHQ@mail.gmail.com>
Subject: Re: [PATCH 0/2] x86, ia64: Move EFI_FB vga_default_device()
 initialization to pci_vga_fixup()
To: =?UTF-8?Q?Bruno_Pr=C3=A9mont?= <bonbons@linux-vserver.org>
Cc: Bjorn Helgaas <bhelgaas@google.com>,
	DRI mailing list <dri-devel@lists.freedesktop.org>,
	Linux PCI <linux-pci@vger.kernel.org>,
	Dave Airlie <airlied@linux.ie>,
	Matthew Garrett <matthew.garrett@nebula.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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On Sat, Aug 16, 2014 at 7:21 PM, Bruno Prémont
<bonbons@linux-vserver.org> wrote:
> This series improves on commit 20cde694027e (x86, ia64: Move EFI_FB
> vga_default_device() initialization to pci_vga_fixup()):
> - cleanup remaining but always-true #ifndefs
> - fix boot regression on dual-GPU Macs
>
> Andreas, can you please test this series? It is a modification from
> previous testing patch that should still work fine for you.
> That testing patch would have been failing X startup on old BIOS systems
> booted with vga=normal (or otherwise in VGA text mode).
>
>
> Greg, in case you have scheduled above-mentioned commit for your next
> stable iteration, please hold it back in the queue until this follow-up
> has landed and can be included within the same stable update as alone
> that patch regresses for Macs with dual-GPU and using efifb.
>
> Bruno

Fails again (with and without efifb).

The vga_set_default_device in vga_arbiter_add_pci_device is at fault.
It sets the boot video device to intel. Removing it makes the system
bootable again.