linux-kernel - platform/x86: asus-wmi: Keyboard backlight brightness does not work correctly on Asus ROG Zephyrus G15

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Message-ID: <1933b52f4cc.d2378f8b154603.5100196514130862791@mitchellaugustin.com>
Date: Sun, 17 Nov 2024 10:11:52 -0800
From: Mitchell Augustin <mitchell@...chellaugustin.com>
To: "Corentin Chary" <corentin.chary@...il.com>,
	"Luke D. Jones" <luke@...nes.dev>,
	"Hans de Goede" <hdegoede@...hat.com>,
	"Ilpo Järvinen" <ilpo.jarvinen@...ux.intel.com>,
	"platform-driver-x86" <platform-driver-x86@...r.kernel.org>,
	"linux-kernel" <linux-kernel@...r.kernel.org>
Subject: platform/x86: asus-wmi: Keyboard backlight brightness does not work
 correctly on Asus ROG Zephyrus G15

Hello,

On my Zephyrus G15 (GA503RM-G15.R93060),
 my keyboard brightness controls do not work. I believe I have traced 
this down to being a kernel issue, based on the fact that my Gnome 
control center slider and `asusctl -k` do result in 
`/sys/class/leds/asus::kbd_backlight/brightness` being updated, but the 
changed value of `/sys/class/leds/asus::kbd_backlight/brightness` is not
 reflective of the actual brightness of my keyboard, which always 
remains unchanged. (I can also confirm that other keyboard/fan control 
features do work, such as the keyboard profile switcher, custom fan 
curves, etc. - so it just seems to be the brightness that is broken.)

If this is likely just a case where I would need to poke around my hardware to 
find the correct values to write for brightness control to work on my 
specific SKU, I would be happy to do that and contribute it back here, but I 
will need some guidance on where to look for that info.

Let me know if that would be helpful, or if there's any other info I can provide to help fix this bug.

Thanks,

Mitchell Augustin