linux-kernel - Re: New sysfs interface for privacy screens

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Date:   Thu, 03 Oct 2019 11:19:13 +0300
From:   Jani Nikula <jani.nikula@...ux.intel.com>
To:     Jonathan Corbet <corbet@....net>, Mat King <mathewk@...gle.com>
Cc:     Daniel Thompson <daniel.thompson@...aro.org>, rafael@...nel.org,
        gregkh@...uxfoundation.org, Ross Zwisler <zwisler@...gle.com>,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        Jingoo Han <jingoohan1@...il.com>,
        Rajat Jain <rajatja@...gle.com>,
        Lee Jones <lee.jones@...aro.org>,
        Alexander Schremmer <alex@...xanderweb.de>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: Re: New sysfs interface for privacy screens

On Wed, 02 Oct 2019, Jonathan Corbet <corbet@....net> wrote:
> On Tue, 1 Oct 2019 10:09:46 -0600
> Mat King <mathewk@...gle.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