From: Daniel Vetter <daniel.vetter@ffwll.ch>
To: Matthew Garrett <mjg59@srcf.ucam.org>
Cc: Yves-Alexis Perez <corsac@debian.org>,
linux-acpi@vger.kernel.org, seth.forshee@canonical.com,
joeyli.kernel@gmail.com,
intel-gfx <intel-gfx@lists.freedesktop.org>,
dri-devel <dri-devel@lists.freedesktop.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Len Brown <lenb@kernel.org>, "Rafael J. Wysocki" <rjw@sisk.pl>,
Henrique de Moraes Holschuh <hmh@debian.org>
Subject: Re: [PATCH 0/3] Fix backlight issues on some Windows 8 systems
Date: Tue, 25 Jun 2013 18:10:35 +0200 [thread overview]
Message-ID: <CAKMK7uEtF9XnPem+rTQuBgAef6RDhRuj-=SdvufTa4zBs80Ssw@mail.gmail.com> (raw)
In-Reply-To: <20130625160848.GA27123@srcf.ucam.org>
On Tue, Jun 25, 2013 at 6:08 PM, Matthew Garrett <mjg59@srcf.ucam.org> wrote:
> On Sat, Jun 22, 2013 at 11:46:39PM +0200, Yves-Alexis Perez wrote:
>
>> Before Linux support for acpi_osi("Windows 2012") (and when booting with
>> acpi_osi="!Windows 2012"), brightness keys were handled by the kernel
>> just fine, whether in console, in the display manager or in my desktop
>> environment (Xfce). xfce4-power-manager just needs to be told that the
>> brightness keys are already handled and it doesn't need to do anything.
>
> Right, the kernel has special-casing to hook the backlight keys up to
> the ACPI backlight control. This is an awful thing, because there's no
> way to detect this case other than parsing a single driver-specific
> module parameter.
>
> Could this functionality be duplicated across other backlight drivers?
> Not easily. The ACPI driver receives keypresses and performs backlight
> control. The i915 driver doesn't receive keypresses. We could easily tie
> certain keycodes into backlight events, but which backlight should they
> control? You're really starting to get into the kind of complex policy
> decision that's best left to userspace, which is where it should have
> been to begin with.
Do we have any chances to amend this mistake by (gradually) phasing
out support for the direct keypress forwarding in ACPI? Or at least
some plans?
-Daniel
--
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch
next prev parent reply other threads:[~2013-06-25 16:10 UTC|newest]
Thread overview: 108+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-06-09 23:01 [PATCH 0/3] Fix backlight issues on some Windows 8 systems Matthew Garrett
2013-06-09 23:01 ` [PATCH 1/3] acpi: video: add function to support unregister backlight interface Matthew Garrett
2013-06-09 23:01 ` [PATCH 2/3] ACPICA: Add interface for getting latest OS version requested via _OSI Matthew Garrett
2013-06-17 22:31 ` Rafael J. Wysocki
2013-06-17 22:37 ` Matthew Garrett
2013-06-17 22:37 ` Matthew Garrett
2013-06-18 0:42 ` Rafael J. Wysocki
2013-06-25 23:23 ` Rafael J. Wysocki
2013-07-02 13:56 ` [PATCH 0/2] Expose OSI version Aaron Lu
2013-07-02 13:59 ` [PATCH 1/2] ACPICA: expose " Aaron Lu
2013-07-02 14:01 ` [PATCH 2/2] ACPI / OSL: add a wrapper function to return " Aaron Lu
2013-07-03 21:57 ` Rafael J. Wysocki
2013-07-04 1:24 ` Aaron Lu
2013-07-05 19:52 ` Rafael J. Wysocki
2013-06-09 23:01 ` [PATCH 3/3] i915: Don't provide ACPI backlight interface if firmware expects Windows 8 Matthew Garrett
2013-06-10 7:40 ` Daniel Vetter
2013-06-10 9:22 ` joeyli
2013-06-10 14:09 ` Alex Deucher
2013-06-14 6:47 ` Aaron Lu
2013-06-14 17:29 ` Matthew Garrett
2013-06-14 17:29 ` Matthew Garrett
2013-06-15 1:26 ` Aaron Lu
2013-06-15 1:38 ` Matthew Garrett
2013-06-15 1:38 ` Matthew Garrett
2013-06-15 4:14 ` Aaron Lu
2013-06-15 4:14 ` Aaron Lu
2013-06-15 4:19 ` Matthew Garrett
2013-06-15 12:29 ` Aaron Lu
2013-06-15 12:29 ` Aaron Lu
2013-06-15 15:16 ` Matthew Garrett
2013-06-15 18:29 ` Daniel Vetter
2013-06-15 18:44 ` Matthew Garrett
2013-06-15 20:27 ` Rafael J. Wysocki
2013-06-15 20:35 ` Daniel Vetter
2013-07-05 12:20 ` Rafael J. Wysocki
2013-07-05 20:00 ` Rafael J. Wysocki
2013-07-05 21:40 ` Rafael J. Wysocki
2013-07-05 22:23 ` Rafael J. Wysocki
2013-07-06 5:45 ` Aaron Lu
2013-07-06 13:33 ` Rafael J. Wysocki
2013-07-07 13:19 ` Rafael J. Wysocki
2013-07-07 13:19 ` Rafael J. Wysocki
2013-07-08 8:00 ` Aaron Lu
2013-07-13 0:46 ` [Update][PATCH] ACPI / video / i915: Remove ACPI backlight " Rafael J. Wysocki
2013-07-15 2:36 ` Aaron Lu
2013-07-15 11:42 ` Rafael J. Wysocki
2013-07-16 3:24 ` Aaron Lu
2013-07-16 11:54 ` Rafael J. Wysocki
2013-07-15 13:06 ` Igor Gnatenko
2013-07-15 13:06 ` Igor Gnatenko
2013-07-15 23:53 ` Rafael J. Wysocki
2013-07-16 7:45 ` Igor Gnatenko
2013-07-16 7:45 ` Igor Gnatenko
2013-07-16 13:32 ` Igor Gnatenko
2013-07-16 13:32 ` Igor Gnatenko
2013-07-16 17:08 ` Matthew Garrett
2013-07-16 17:08 ` Matthew Garrett
2013-07-16 22:01 ` Rafael J. Wysocki
2013-07-17 5:16 ` Igor Gnatenko
2013-07-17 5:16 ` Igor Gnatenko
2013-07-17 11:38 ` Rafael J. Wysocki
2013-07-17 12:03 ` Igor Gnatenko
2013-07-17 12:03 ` Igor Gnatenko
2013-06-10 11:59 ` [PATCH 0/3] Fix backlight issues on some Windows 8 systems Rafael J. Wysocki
2013-06-10 13:48 ` Matthew Garrett
2013-06-10 13:48 ` Matthew Garrett
2013-06-11 13:08 ` Seth Forshee
2013-06-22 21:46 ` Yves-Alexis Perez
2013-06-25 16:08 ` Matthew Garrett
2013-06-25 16:10 ` Daniel Vetter [this message]
2013-06-25 16:13 ` Matthew Garrett
2013-06-25 20:43 ` Yves-Alexis Perez
2013-06-25 20:43 ` Yves-Alexis Perez
2013-06-25 20:54 ` Matthew Garrett
2013-06-25 21:10 ` Yves-Alexis Perez
2013-06-25 21:14 ` Matthew Garrett
2013-06-25 21:30 ` Yves-Alexis Perez
2013-06-25 21:33 ` Matthew Garrett
2013-06-25 21:33 ` Matthew Garrett
2013-06-25 21:46 ` Yves-Alexis Perez
2013-06-25 21:49 ` Matthew Garrett
2013-06-25 21:49 ` Matthew Garrett
2013-07-17 15:51 ` Felipe Contreras
2013-07-17 19:57 ` Yves-Alexis Perez
2013-07-18 0:16 ` [Update][PATCH " Rafael J. Wysocki
2013-07-18 0:20 ` [PATCH 1/3] ACPICA: expose OSI version Rafael J. Wysocki
2013-07-18 5:38 ` Igor Gnatenko
2013-07-18 5:38 ` Igor Gnatenko
2013-07-18 0:21 ` [PATCH 2/3] ACPI / video: Always call acpi_video_init_brightness() on init Rafael J. Wysocki
2013-07-18 5:40 ` Igor Gnatenko
2013-07-18 5:40 ` Igor Gnatenko
2013-07-18 0:22 ` [PATCH 3/3] ACPI / video / i915: No ACPI backlight if firmware expects Windows 8 Rafael J. Wysocki
2013-07-20 13:16 ` [Update][PATCH 0/3] Fix backlight issues on some Windows 8 systems Felipe Contreras
2013-07-26 13:24 ` Jani Nikula
2013-07-29 18:01 ` Felipe Contreras
2013-07-30 5:03 ` Jani Nikula
2013-07-31 0:01 ` Rafael J. Wysocki
2013-07-31 0:01 ` Matthew Garrett
2013-07-31 0:01 ` Matthew Garrett
2013-07-31 6:48 ` Igor Gnatenko
2013-07-31 6:48 ` Igor Gnatenko
2013-07-31 9:08 ` Aaron Lu
2013-08-07 7:44 ` Backlight control only in the kernel? Borislav Petkov
2013-08-07 9:03 ` Aaron Lu
2013-08-07 10:34 ` Borislav Petkov
2013-08-07 10:36 ` Matthew Garrett
2013-08-07 10:36 ` Matthew Garrett
2013-08-07 11:04 ` Borislav Petkov
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