From: Yves-Alexis Perez <corsac@debian.org>
To: Aaron Lu <aaron.lu@intel.com>
Cc: Matthew Garrett <matthew.garrett@nebula.com>,
Seth Forshee <seth.forshee@canonical.com>,
intel-gfx@lists.freedesktop.org,
Felipe Contreras <felipe.contreras@gmail.com>,
Henrique de Moraes Holschuh <ibm-acpi@hmh.eng.br>,
linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org,
"Rafael J. Wysocki" <rjw@sisk.pl>,
linux-acpi@vger.kernel.org, Lee Chun-Yi <joeyli.kernel@gmail.com>,
Richard Purdie <rpurdie@rpsys.net>,
Igor Gnatenko <i.gnatenko.brain@gmail.com>
Subject: Re: [PATCH v2 3/3] ACPI / video: Do not register backlight if win8 and native interface exists
Date: Fri, 20 Sep 2013 15:02:12 +0200 [thread overview]
Message-ID: <1379682132.9746.6.camel@oban> (raw)
In-Reply-To: <1379409796-29350-4-git-send-email-aaron.lu@intel.com>
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On mar., 2013-09-17 at 17:23 +0800, Aaron Lu wrote:
> According to Matthew Garrett, "Windows 8 leaves backlight control up
> to individual graphics drivers rather than making ACPI calls itself.
> There's plenty of evidence to suggest that the Intel driver for
> Windows 8 doesn't use the ACPI interface, including the fact that
> it's broken on a bunch of machines when the OS claims to support
> Windows 8. The simplest thing to do appears to be to disable the
> ACPI backlight interface on these systems".
>
> So for Win8 systems, if there is native backlight control interface
> registered by GPU driver, ACPI video will not register its own. For
> users who prefer to keep ACPI video's backlight interface, the
> existing
> kernel cmdline option acpi_backlight=video can be used.
>
> This patch is an evolution from previous work done by Matthew Garrett,
> Chun-Yi Lee, Seth Forshee and Rafael J. Wysocki.
>
> Signed-off-by: Aaron Lu <aaron.lu@intel.com>
Tested-by: Yves-Alexis Perez <corsac@debian.org>
--
Yves-Alexis
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_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
http://lists.freedesktop.org/mailman/listinfo/intel-gfx
WARNING: multiple messages have this Message-ID (diff)
From: Yves-Alexis Perez <corsac@debian.org>
To: Aaron Lu <aaron.lu@intel.com>
Cc: linux-acpi@vger.kernel.org, intel-gfx@lists.freedesktop.org,
dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org,
Daniel Vetter <daniel@ffwll.ch>,
"Rafael J. Wysocki" <rjw@sisk.pl>,
Matthew Garrett <matthew.garrett@nebula.com>,
Seth Forshee <seth.forshee@canonical.com>,
Lee Chun-Yi <joeyli.kernel@gmail.com>,
Richard Purdie <rpurdie@rpsys.net>,
Igor Gnatenko <i.gnatenko.brain@gmail.com>,
Felipe Contreras <felipe.contreras@gmail.com>,
Henrique de Moraes Holschuh <ibm-acpi@hmh.eng.br>,
Jani Nikula <jani.nikula@linux.intel.com>
Subject: Re: [PATCH v2 3/3] ACPI / video: Do not register backlight if win8 and native interface exists
Date: Fri, 20 Sep 2013 15:02:12 +0200 [thread overview]
Message-ID: <1379682132.9746.6.camel@oban> (raw)
In-Reply-To: <1379409796-29350-4-git-send-email-aaron.lu@intel.com>
[-- Attachment #1: Type: text/plain, Size: 1050 bytes --]
On mar., 2013-09-17 at 17:23 +0800, Aaron Lu wrote:
> According to Matthew Garrett, "Windows 8 leaves backlight control up
> to individual graphics drivers rather than making ACPI calls itself.
> There's plenty of evidence to suggest that the Intel driver for
> Windows 8 doesn't use the ACPI interface, including the fact that
> it's broken on a bunch of machines when the OS claims to support
> Windows 8. The simplest thing to do appears to be to disable the
> ACPI backlight interface on these systems".
>
> So for Win8 systems, if there is native backlight control interface
> registered by GPU driver, ACPI video will not register its own. For
> users who prefer to keep ACPI video's backlight interface, the
> existing
> kernel cmdline option acpi_backlight=video can be used.
>
> This patch is an evolution from previous work done by Matthew Garrett,
> Chun-Yi Lee, Seth Forshee and Rafael J. Wysocki.
>
> Signed-off-by: Aaron Lu <aaron.lu@intel.com>
Tested-by: Yves-Alexis Perez <corsac@debian.org>
--
Yves-Alexis
[-- Attachment #2: This is a digitally signed message part --]
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next prev parent reply other threads:[~2013-09-20 13:02 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-09-17 9:23 [PATCH v2 0/3] Fix Win8 backlight issue Aaron Lu
2013-09-17 9:23 ` [PATCH v2 1/3] backlight: introduce backlight_device_registered Aaron Lu
2013-09-17 13:03 ` Igor Gnatenko
2013-09-20 13:01 ` Yves-Alexis Perez
2013-09-20 13:01 ` Yves-Alexis Perez
2013-09-17 9:23 ` [PATCH v2 2/3] ACPI / video: seperate backlight control and event interface Aaron Lu
2013-09-17 13:04 ` Igor Gnatenko
2013-09-20 13:01 ` Yves-Alexis Perez
2013-09-20 13:01 ` Yves-Alexis Perez
2013-09-17 9:23 ` [PATCH v2 3/3] ACPI / video: Do not register backlight if win8 and native interface exists Aaron Lu
2013-09-17 13:04 ` Igor Gnatenko
2013-09-20 8:36 ` Jani Nikula
2013-09-20 8:36 ` Jani Nikula
2013-09-22 2:47 ` Aaron Lu
2013-09-22 2:47 ` Aaron Lu
2013-09-20 13:02 ` Yves-Alexis Perez [this message]
2013-09-20 13:02 ` Yves-Alexis Perez
2013-09-17 13:34 ` [PATCH v2 0/3] Fix Win8 backlight issue Igor Gnatenko
2013-09-18 1:03 ` Aaron Lu
2013-09-18 1:03 ` Aaron Lu
2013-09-18 6:30 ` Igor Gnatenko
2013-09-18 12:31 ` Aaron Lu
2013-09-18 12:36 ` Igor Gnatenko
2013-09-22 9:10 ` Aaron Lu
2013-09-22 10:23 ` Igor Gnatenko
2013-09-20 13:00 ` Yves-Alexis Perez
2013-09-20 13:00 ` Yves-Alexis Perez
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