From: Jani Nikula <jani.nikula@linux.intel.com>
To: Matthew Garrett <matthew.garrett@nebula.com>
Cc: Aaron Lu <aaron.lu@intel.com>, "Rafael J. Wysocki" <rjw@sisk.pl>,
Daniel Vetter <daniel@ffwll.ch>,
ACPI Devel Mailing List <linux-acpi@vger.kernel.org>,
Daniel Vetter <daniel.vetter@ffwll.ch>,
"intel-gfx\@lists.freedesktop.org"
<intel-gfx@lists.freedesktop.org>,
Yves-Alexis Perez <corsac@debian.org>,
"linux-kernel\@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"dri-devel\@lists.freedesktop.org"
<dri-devel@lists.freedesktop.org>,
Seth Forshee <seth.forshee@canonical.com>, "Lee\,
Chun-Yi" <joeyli.kernel@gmail.com>,
Igor Gnatenko <i.gnatenko.brain@gmail.com>,
Henrique de Moraes Holschuh <hmh@hmh.eng.br>,
Lee Chun-Yi <jlee@novell.com>, Len Brown <lenb@kernel.org>
Subject: Re: [PATCH 2/2] ACPI / video / i915: Remove ACPI backlight if firmware expects Windows 8
Date: Wed, 11 Sep 2013 13:29:29 +0300 [thread overview]
Message-ID: <87d2ofy7li.fsf@intel.com> (raw)
In-Reply-To: <1378889140.945.0.camel@x230.lan>
On Wed, 11 Sep 2013, Matthew Garrett <matthew.garrett@nebula.com> wrote:
> On Wed, 2013-09-11 at 11:45 +0300, Jani Nikula wrote:
>
>> Before plunging forward, have you observed any difference between the
>> boot modes? We have reports [1] that the backlight behaviour is
>> different with UEFI vs. UEFI+CSM or legacy boot. So I'm wondering if the
>> acpi_gbl_osi_data >= ACPI_OSI_WIN_8 check in patch 2/2 is the whole
>> story.
>>
>> Further, if we tell the BIOS we're Windows 8 to use the tested BIOS code
>> paths, what guarantees do we have of UEFI+CSM or legacy boots working?
>
> We have no evidence of Windows behaving differently based on the exposed
> firmware type.
By "behaving differently", do you mean internally adapting to the boot
mode, or exhibiting different behaviour to the user?
We have evidence of the firmware behaving differently (VBT, backlight)
based on the boot mode, all else being equal. We don't adapt to that,
and we fail. I don't know if we should adapt, or do things differently
altogether. I don't even know if Windows 8 works on all boot modes on
the machines in question.
BR,
Jani.
--
Jani Nikula, Intel Open Source Technology Center
next prev parent reply other threads:[~2013-09-11 10:27 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-09-09 8:37 [PATCH 0/2] Rework ACPI video driver Aaron Lu
2013-09-09 8:40 ` [PATCH 1/2] ACPI / video: seperate backlight control and event interface Aaron Lu
2013-09-10 5:23 ` Igor Gnatenko
2013-09-09 8:42 ` [PATCH 2/2] ACPI / video / i915: Remove ACPI backlight if firmware expects Windows 8 Aaron Lu
2013-09-09 9:32 ` Daniel Vetter
2013-09-09 12:16 ` Rafael J. Wysocki
2013-09-09 15:21 ` Daniel Vetter
2013-09-09 15:38 ` Matthew Garrett
2013-09-09 20:23 ` Rafael J. Wysocki
2013-09-10 13:53 ` Jani Nikula
2013-09-10 13:56 ` Matthew Garrett
2013-09-10 14:21 ` Jani Nikula
2013-09-10 14:21 ` Matthew Garrett
2013-09-10 19:23 ` Rafael J. Wysocki
2013-09-11 1:32 ` Aaron Lu
2013-09-11 8:45 ` Jani Nikula
2013-09-11 8:45 ` Matthew Garrett
2013-09-11 9:09 ` Yves-Alexis Perez
2013-09-11 10:29 ` Jani Nikula [this message]
2013-09-11 10:30 ` Matthew Garrett
2013-09-12 2:26 ` Aaron Lu
2013-09-10 6:30 ` Aaron Lu
2013-09-09 11:44 ` Igor Gnatenko
2013-09-10 3:27 ` Aaron Lu
2013-09-10 5:13 ` Igor Gnatenko
2013-09-10 5:16 ` Aaron Lu
2013-09-10 5:22 ` Igor Gnatenko
2013-09-10 5:42 ` Aaron Lu
2013-09-10 5:23 ` Igor Gnatenko
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