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

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Date:   Sun, 6 Oct 2019 16:48:31 +0000
From:   Jingoo Han <jingoohan1@...il.com>
To:     Pavel Machek <pavel@...x.de>,
        Daniel Thompson <daniel.thompson@...aro.org>,
        "alex@...xanderweb.de" <alex@...xanderweb.de>,
        "andriy.shevchenko@...ux.intel.com" 
        <andriy.shevchenko@...ux.intel.com>
CC:     Jani Nikula <jani.nikula@...ux.intel.com>,
        Jonathan Corbet <corbet@....net>,
        Mat King <mathewk@...gle.com>,
        "rafael@...nel.org" <rafael@...nel.org>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        Ross Zwisler <zwisler@...gle.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        Rajat Jain <rajatja@...gle.com>,
        Lee Jones <lee.jones@...aro.org>,
        Alexander Schremmer <alex@...xanderweb.de>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Han Jingoo <jingoohan1@...il.com>
Subject: Re: New sysfs interface for privacy screens



> On 10/6/19, 7:04 AM, Pavel Machek wrote:
>
> Hi!
>
> > > >> 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. :(
> > 
> > I guess... although the Thinkpad code hasn't added any standard
> > interfaces (no other laptop should be placing controls for a privacy
> > screen in /proc/acpi/ibm/... ). Maybe its not too late.
>
> There's new interface for controlling privacyguard... but perhaps we
> need better solution than what went in 5.4. Perhaps it should be
> reconsidered?

I agree with your opinion. I also think that better solution can be considered,
although there is already something in 5.4.

Best regards,
Jingoo Han

>
> Best regards,
>									Pavel
> -- 
> (english) http://www.livejournal.com/~pavelmachek
> (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html