Re: [Regression]: Changing brightness does not work with v3.16-rc4

[Julian Wollrath <jwollrath@web.de>]

Hi,

Am Mon, 14 Jul 2014 10:06:21 +0800
schrieb Aaron Lu <aaron.lu@intel.com>:
> > 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
> ...
yes, my system has /sys/class/backlight/intel_backlight and changing
the brightness works with writing to the "brightness"-file.

Cheers,
Julian