linux-kernel - Re: [PATCH v2] platform/x86: asus-wmi: Add keyboard backlight toggle support

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Message-ID: <2634178c3b1fb2c1174eae0d67419e285e2f7c26.camel@sipsolutions.net>
Date:   Mon, 04 Jun 2018 11:27:43 +0200
From:   Benjamin Berg <benjamin@...solutions.net>
To:     Chris Chiu <chiu@...lessm.com>, Daniel Drake <drake@...lessm.com>,
        Hans de Goede <hdegoede@...hat.com>
Cc:     Andy Shevchenko <andy.shevchenko@...il.com>,
        Corentin Chary <corentin.chary@...il.com>,
        Darren Hart <dvhart@...radead.org>,
        Andy Shevchenko <andy@...radead.org>,
        acpi4asus-user <acpi4asus-user@...ts.sourceforge.net>,
        Platform Driver <platform-driver-x86@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Upstreaming Team <linux@...lessm.com>,
        Jian-Hong Pan <jian-hong@...lessm.com>
Subject: Re: [PATCH v2] platform/x86: asus-wmi: Add keyboard backlight
 toggle support

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 thought
> 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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