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Date: Mon, 10 Aug 2026 11:32:47 +0100
From: Daniel Thompson <danielt@kernel.org>
To: Junjie Cao <junjie.cao@intel.com>
Cc: Lee Jones <lee@kernel.org>, Jingoo Han <jingoohan1@gmail.com>,
	dri-devel@lists.freedesktop.org, linux-leds@vger.kernel.org,
	linux-kernel@vger.kernel.org, Pengyu Luo <mitltlatltl@gmail.com>,
	stable@vger.kernel.org, Junjie Cao <junjie.cao@linux.dev>
Subject: Re: [PATCH v3 3/3] backlight: aw99706: Honor the core blank state in
 update_status()
Message-ID: <anmoz-Of5W-pjz-6@aspen.lan>
References: <20260804030255.1934470-1-junjie.cao@intel.com>
 <20260804030255.1934470-4-junjie.cao@intel.com>
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In-Reply-To: <20260804030255.1934470-4-junjie.cao@intel.com>

On Tue, Aug 04, 2026 at 11:02:55AM +0800, Junjie Cao wrote:
> From: Junjie Cao <junjie.cao@linux.dev>
>
> update_status() passes props.brightness straight to the hardware and
> ignores the power/blank state tracked by the core. Writing 4 to the
> bl_power sysfs attribute or blanking the framebuffer therefore leaves
> the backlight lit.
>
> Use backlight_get_brightness(), which returns 0 while the device is
> blanked.
>
> Fixes: 147b38a5ad06 ("backlight: aw99706: Add support for Awinic AW99706 backlight")
> Cc: stable@vger.kernel.org
> Signed-off-by: Junjie Cao <junjie.cao@linux.dev>

Reviewed-by: Daniel Thompson (RISCstar) <danielt@kernel.org>


Daniel.