New sysfs interface for privacy screens

Pavel Machek pavel at
Sun Oct 6 11:00:45 UTC 2019

On Wed 2019-10-02 09:46:50, Jonathan Corbet wrote:
> On Tue, 1 Oct 2019 10:09:46 -0600
> Mat King <mathewk at> 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:

Hmm. We may want to revert that one because it does more damage :-(.
(cesky, pictures)
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