Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
From:   Jani Nikula <jani.nikula@linux.intel.com>
To:     Jonathan Corbet <corbet@lwn.net>, Mat King <mathewk@google.com>
Cc:     Daniel Thompson <daniel.thompson@linaro.org>, rafael@kernel.org,
        gregkh@linuxfoundation.org, Ross Zwisler <zwisler@google.com>,
        linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org,
        Jingoo Han <jingoohan1@gmail.com>,
        Rajat Jain <rajatja@google.com>,
        Lee Jones <lee.jones@linaro.org>,
        Alexander Schremmer <alex@alexanderweb.de>,
        Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Subject: Re: New sysfs interface for privacy screens
In-Reply-To: <20191002094650.3fc06a85@lwn.net>
Organization: Intel Finland Oy - BIC 0357606-4 - Westendinkatu 7, 02160 Espoo
References: <CAL_quvRknSSVvXN3q_Se0hrziw2oTNS3ENNoeHYhvciCRq9Yww@mail.gmail.com> <20191002094650.3fc06a85@lwn.net>
Date:   Thu, 03 Oct 2019 11:19:13 +0300
Message-ID: <87muei9r7i.fsf@intel.com>
MIME-Version: 1.0
Content-Type: text/plain
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On Wed, 02 Oct 2019, Jonathan Corbet <corbet@lwn.net> wrote:
> On Tue, 1 Oct 2019 10:09:46 -0600
> Mat King <mathewk@google.com> wrote:
>
>> I have been looking into adding Linux support for electronic privacy
>> screens which is a feature on some new laptops which is built into the
>> display and allows users to turn it on instead of needing to use a
>> physical privacy filter. In discussions with my colleagues the idea of
>> using either /sys/class/backlight or /sys/class/leds but this new
>> feature does not seem to quite fit into either of those classes.
>
> FWIW, it seems that you're not alone in this; 5.4 got some support for
> such screens if I understand things correctly:
>
>   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=110ea1d833ad

Oh, I didn't realize it got merged already, I thought this was
related...

So we've already replicated the backlight sysfs interface problem for
privacy screens. :(

BR,
Jani.


-- 
Jani Nikula, Intel Open Source Graphics Center