From: Aaron Lu <aaron.lu@intel.com>
To: Julian Wollrath <jwollrath@web.de>, linux-acpi@vger.kernel.org
Subject: Re: [Regression]: Changing brightness does not work with v3.16-rc4
Date: Mon, 14 Jul 2014 10:06:21 +0800 [thread overview]
Message-ID: <53C33B1D.4070500@intel.com> (raw)
In-Reply-To: <20140712180636.698e2e4c@saldaea>
On 07/13/2014 12:06 AM, Julian Wollrath wrote:
> Hi,
>
> changing the brightness on my Thinkpad X230 with Intel HD4000 graphics,
> stopped working after commit 886129a8eebe (ACPI / video: change
> acpi-video brightness_switch_enabled default to 0). Changing it back to
> 1, fixes the problem, if "acpi_osi=!Windows 2012" is also set. Before
> that commit just setting "acpi_osi=!Windows 2012" was enough to get
> changing the brightness working.
Does your system have /sys/class/backlight/intel_backlight? Does it work
if you manually change the brightness file like this:
# cd /sys/class/backlight/intel_backlight
# cat max_brightness
xxxxx
# echo xxx > brightness
# echo xxx > brightness
...
Thanks,
Aaron
>
>
> With best regards,
> Julian Wollrath
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next prev parent reply other threads:[~2014-07-14 2:06 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-12 16:06 [Regression]: Changing brightness does not work with v3.16-rc4 Julian Wollrath
2014-07-12 16:24 ` Julian Wollrath
2014-07-14 18:21 ` Rafael J. Wysocki
2014-07-14 18:34 ` Julian Wollrath
2014-07-14 19:02 ` Rafael J. Wysocki
2014-07-14 19:10 ` Rafael J. Wysocki
2014-07-14 18:56 ` Julian Wollrath
2014-07-14 19:17 ` Rafael J. Wysocki
2014-07-15 6:06 ` Aaron Lu
2014-07-15 12:27 ` Rafael J. Wysocki
2014-07-15 14:00 ` Aaron Lu
2014-07-15 14:05 ` Hans de Goede
2014-07-15 14:45 ` Aaron Lu
2014-07-16 0:43 ` Rafael J. Wysocki
2014-07-16 6:29 ` Hans de Goede
2014-07-16 7:19 ` Aaron Lu
2014-07-16 8:13 ` Hans de Goede
2014-07-16 8:30 ` Aaron Lu
2014-07-16 8:35 ` Hans de Goede
2014-07-16 11:50 ` Julian Wollrath
2014-07-16 11:52 ` Hans de Goede
2014-07-15 21:38 ` Julian Wollrath
2014-07-16 2:36 ` Aaron Lu
2014-07-16 11:36 ` Julian Wollrath
2014-07-14 2:06 ` Aaron Lu [this message]
2014-07-14 12:42 ` Julian Wollrath
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