Re: [arch-general] Fn-F{5, 6} keys for backlight - how to disable native handling?

On Thu, Jun 27, 2013 at 1:35 PM, Martín Cigorraga wrote:

On Wed, Jun 26, 2013 at 2:22 PM, Leonardo Dagnino wrote:

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2013/6/25 Oon-Ee Ng

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I have an ASUS N56V where the Fn-F{5,6} keys do not work natively (no output in xev when pressed). This is very easily worked-around using acpi_os="!Windows 2012".

The resulting control is something along the 3-10 range (10 being brightest and 0 being off, these are not the actual numerical values), which means I can't dim my backlight beyond a certain value. Similarly, using xbacklight and setting to 0 actually gives a "3" backlight, not totally blank. Setting /sys/class/backlight/intel_backlight/brightness to 0 does turn the screen off though.

The problem is that if I write a simple script to adjust brightness and bind that using xbindkeys, the native handler still works for a fraction of a second before the value I calculate takes effect. This results in a brief flicker everytime I press the keys.

Conclusion - I want to disable this native handling of Fn-F{5,6}, is this possible or is this not software-controlled?

Before giving up the native handling please try adding the kernel flag "acpi_backlight=vendor".

Hi Martin, I tried that before in conjunction with the requisite acpi_osi="!Windows 2012" (for my laptop). If just acpi_osi is set, at least I can recognize the keys and get the slightly buggy behaviour I'm mentioning. With acpi_backlight=vendor the keys don't respond at all.