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Subject: Re: [PATCH v2] platform/x86: asus-wmi: Add keyboard backlight
 toggle support
From: Benjamin Berg <benjamin@sipsolutions.net>
To: Chris Chiu <chiu@endlessm.com>, Daniel Drake <drake@endlessm.com>,
        Hans de Goede <hdegoede@redhat.com>
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Date: Mon, 04 Jun 2018 11:27:43 +0200
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Hi,

On Thu, 2018-05-24 at 16:33 +0800, Chris Chiu wrote:
> I've made my change to set the brightness level directly in the
> driver, but the
> OSD doesn't show correctly correspond to the level value. The brightness =
shows
> OK in /sys/class/led/xxxx/brighness but the OSD always shows level 0. I t=
hought
> GNOME should read the brightness from /sys before showing OSD?

Sorry for the late response.

There is a special mechanism to report that the HW changed the
brightness. This works using the "brightness_hw_changed" sysfs
attribute. So you will need to set the LED_BRIGHT_HW_CHANGED flag on
the LED and then call led_classdev_notify_brightness_hw_changed to make
it work.

Userspace should correctly show the OSD when this is done.

Benjamin
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