From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.3 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 02E17C10F14 for ; Sun, 6 Oct 2019 11:00:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id CC5E12084B for ; Sun, 6 Oct 2019 11:00:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726633AbfJFLAs (ORCPT ); Sun, 6 Oct 2019 07:00:48 -0400 Received: from atrey.karlin.mff.cuni.cz ([195.113.26.193]:43555 "EHLO atrey.karlin.mff.cuni.cz" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726224AbfJFLAr (ORCPT ); Sun, 6 Oct 2019 07:00:47 -0400 Received: by atrey.karlin.mff.cuni.cz (Postfix, from userid 512) id 27F0D80471; Sun, 6 Oct 2019 13:00:31 +0200 (CEST) Date: Sun, 6 Oct 2019 13:00:45 +0200 From: Pavel Machek To: Jonathan Corbet Cc: Mat King , linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, gregkh@linuxfoundation.org, rafael@kernel.org, Ross Zwisler , Rajat Jain , Lee Jones , Daniel Thompson , Jingoo Han , Alexander Schremmer Subject: Re: New sysfs interface for privacy screens Message-ID: <20191006110045.GB24605@amd> References: <20191002094650.3fc06a85@lwn.net> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="bCsyhTFzCvuiizWE" Content-Disposition: inline In-Reply-To: <20191002094650.3fc06a85@lwn.net> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --bCsyhTFzCvuiizWE Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Wed 2019-10-02 09:46:50, Jonathan Corbet wrote: > On Tue, 1 Oct 2019 10:09:46 -0600 > Mat King wrote: >=20 > > 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. >=20 > FWIW, it seems that you're not alone in this; 5.4 got some support for > such screens if I understand things correctly: >=20 > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/comm= it/?id=3D110ea1d833ad Hmm. We may want to revert that one because it does more damage :-(. Pavel --=20 (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blo= g.html --bCsyhTFzCvuiizWE Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Digital signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iEYEARECAAYFAl2ZyV0ACgkQMOfwapXb+vLMsgCgvF0IGuV68NhxRO0Vrfpn9drc tRMAoLOK4nrZ6f33bOuuV/8VbK9F49Xk =iq5R -----END PGP SIGNATURE----- --bCsyhTFzCvuiizWE--