From: Zhang Rui <rui.zhang@intel.com>
To: Norbert Preining <preining@logic.at>
Cc: Matthew Garrett <mjg59@srcf.ucam.org>,
Mattia Dongili <malattia@linux.it>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
ACPI Devel Mailing List <linux-acpi@vger.kernel.org>
Subject: Re: regression since 2.6.36: backlight in sony-laptop not working
Date: Fri, 12 Nov 2010 15:38:39 +0800 [thread overview]
Message-ID: <1289547519.8148.1795.camel@rui> (raw)
In-Reply-To: <20101112035027.GD26742@gamma.logic.tuwien.ac.at>
On Fri, 2010-11-12 at 11:50 +0800, Norbert Preining wrote:
> On Fr, 12 Nov 2010, Matthew Garrett wrote:
> > > Seems so that the sys files have changed to new locations:
> > > /sys/devices/virtual/backlight/acpi_video0/brightness
> > >
> > > (mind the additional "virtual")
> > > as well as thermal zone etc etc.
> > >
I think the /sys/class/thermal/ and /sys/class/backlight/acpi_video0
still exists, right?
we make ACPI video procfs I/F depend on CONFIG_ACPI_PROCFS, which is
cleared by default, in 2.6.36, and removed this I/F in 2.6.37-rc1.
perhaps the backlight control depends on the procfs I/F?
thanks,
rui
> > > Could that explain the problem?
> >
> > Only if you have some wonderfully badly written software. What are you
> > using to control the backlight? Also, I'd note that in this case your
> > backlight is controlled via ACPI, not sony-laptop.
>
> Ah right, yes, so probabyl sony-laptopt has nothing to do with it.
>
> THen the problem is simply that the acpi events are not coming through
> when pressing the respective keys.
>
> But *that* might be part of the sony-laptop kernel module?
>
> Best wishes
>
> Norbert
> ------------------------------------------------------------------------
> Norbert Preining preining@{jaist.ac.jp, logic.at, debian.org}
> JAIST, Japan TeX Live & Debian Developer
> DSA: 0x09C5B094 fp: 14DF 2E6C 0307 BE6D AD76 A9C0 D2BF 4AA3 09C5 B094
> ------------------------------------------------------------------------
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next prev parent reply other threads:[~2010-11-12 7:37 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-11-04 14:29 regression since 2.6.36: backlight in sony-laptop not working Norbert Preining
2010-11-10 3:58 ` Mattia Dongili
2010-11-11 23:50 ` Norbert Preining
2010-11-12 3:44 ` Matthew Garrett
2010-11-12 3:50 ` Norbert Preining
2010-11-12 3:57 ` Matthew Garrett
2010-11-12 4:14 ` Norbert Preining
2010-11-12 4:22 ` Mattia Dongili
2010-11-12 4:39 ` Norbert Preining
2010-11-12 12:17 ` Mattia Dongili
2010-11-16 5:16 ` Norbert Preining
2010-11-16 14:18 ` Mattia Dongili
2010-11-16 17:41 ` Dmitry Torokhov
2010-11-17 6:30 ` Norbert Preining
2010-11-17 6:33 ` Norbert Preining
2010-11-17 6:52 ` Dmitry Torokhov
2010-11-18 11:04 ` Mattia Dongili
2010-11-18 13:34 ` Mattia Dongili
2010-11-18 18:06 ` Dmitry Torokhov
2010-11-17 7:12 ` Dmitry Torokhov
2010-11-12 7:38 ` Zhang Rui [this message]
2010-11-12 10:10 ` Norbert Preining
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