linux-kernel - Re: Regression: Screen turns off when booting in EFI mode

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Message-ID: <CAErSpo7iUsV4ca0vhs085_prsTXBEvuTnuw1O_NUr-CvUytYGQ@mail.gmail.com>
Date:	Wed, 27 Mar 2013 13:29:15 -0600
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	Matthew Garrett <mjg59@...f.ucam.org>
Cc:	Dave Airlie <airlied@...il.com>,
	Mantas Mikulėnas <grawity@...il.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Matthew Garrett <mjg@...hat.com>,
	Seth Forshee <seth.forshee@...onical.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Ben Skeggs <skeggsb@...il.com>, bugzilla@...orremedies.com
Subject: Re: Regression: Screen turns off when booting in EFI mode

[+cc Chris, reporter of Fedora issue]

On Mon, Mar 25, 2013 at 5:55 PM, Matthew Garrett <mjg59@...f.ucam.org> wrote:
> On Tue, Mar 26, 2013 at 09:52:14AM +1000, Dave Airlie wrote:
>> >>> Because it's the only way to get the PCI ROM in some cases, like on
>> >>> pretty much all Apples with Radeons. Only using it if we have no other
>> >>> options probably makes sense, though. Something like this (entirely
>> >>> untested)?
>> >>
>> >> This looks reasonable. Mantas?
>> >
>> > It compiles, boots, and even makes the graphics card work again.
>> > So it looks good to me.
>>
>> https://bugzilla.redhat.com/show_bug.cgi?id=927451
>>
>> popped up sounds like a regression caused by this.

That RedHat bugzilla is from kernel-3.9.0-0.rc4.git0.1.fc19.x86_64.
Does that kernel include Matthew's patch from Mar 19?  I'm wondering
if that report is for the same problem Mantas saw and possibly would
be *fixed* by the Mar 19 patch, or if it is for a problem with the Mar
19 patch itself.

I would check this myself, but I don't know how to figure out what's
in kernel-3.9.0-0.rc4.git0.1.fc19.x86_64.

Mantas confirmed that the Mar 19 problem fixed *his* issue, but I
haven't seen any reports from either Mantas or Chris (the RedHat
bugzilla reporter) for the new Mar 26 patches.

> Sigh. I guess we need to figure out where it thinks it's getting that
> image from. The alternative is basically to go back to what Linus
> suggested, remove this from pci_map_rom() and add an explicit lookup to
> the video drivers.
>
> --
> Matthew Garrett | mjg59@...f.ucam.org
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