linux-kernel - Re: [v3.11-rc2] regression: brightness always on maximum.

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Message-ID: <CADDKRnDNoqYCzS_gKHhKvymEgtRVoptmeYDHf3ujSAYe5KpVGw@mail.gmail.com>
Date:	Wed, 24 Jul 2013 12:57:01 +0200
From:	Jörg Otte <jrg.otte@...il.com>
To:	Aaron Lu <aaron.lwe@...il.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	rafael.j.wysocki@...el.com,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [v3.11-rc2] regression: brightness always on maximum.

2013/7/24 Aaron Lu <aaron.lwe@...il.com>:
> On 07/23/2013 03:52 PM, Jörg Otte wrote:
>> The brightness of my laptop is always on maximum and can't be scaled
>> down.
>> Brightness control via function keys was always working on this
>> laptop, so this is a regression in v3.11-rc2.
>
> Please list /sys/class/backlight.

# cd /sys/class
# find backlight -name "*"
backlight
backlight/intel_backlight
# cd backlight/intel_backlight
# ls
actual_brightness  bl_power  brightness  device  max_brightness  power
 subsystem  type  uevent
# cat actual_brightness
0
# cat max_brightness
4882

actual_brightness is 0, but brightness is on maximum!

>
> If there is a intel_backlight, please try to adjust brightness level
> through brightness file like this:
> # echo XXX > /sys/class/backlight/intel_backlight/brightness
> Does it work?

no, it doesn't have any visible effect.


Thanks, Jörg
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