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

[Aaron Lu <aaron.lu@intel.com>]

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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