New sysfs interface for privacy screens
pavel at denx.de
Sun Oct 6 11:04:56 UTC 2019
> > >> 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
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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