From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andrey Borzenkov Subject: Re: [PATCH] toshiba_acpi: fingers off backlight if video.ko is serving this functionality Date: Sat, 15 Nov 2008 19:30:57 +0300 Message-ID: <200811151930.58898.arvidjaar@mail.ru> References: <200811081637.45099.arvidjaar@mail.ru> <200811130758.13420.arvidjaar@mail.ru> <20081113111157.GA30587@srcf.ucam.org> Mime-Version: 1.0 Content-Type: multipart/signed; boundary="nextPart1431708.EXrti5RfbD"; protocol="application/pgp-signature"; micalg=pgp-sha1 Content-Transfer-Encoding: 7bit Return-path: Received: from mx40.mail.ru ([194.67.23.36]:61710 "EHLO mx40.mail.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751346AbYKOQbG (ORCPT ); Sat, 15 Nov 2008 11:31:06 -0500 In-Reply-To: <20081113111157.GA30587@srcf.ucam.org> Sender: linux-acpi-owner@vger.kernel.org List-Id: linux-acpi@vger.kernel.org To: Matthew Garrett Cc: Thomas Renninger , Len Brown , linux-acpi@vger.kernel.org --nextPart1431708.EXrti5RfbD Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Content-Disposition: inline On Thursday 13 November 2008, Matthew Garrett wrote: > On Thu, Nov 13, 2008 at 07:58:09AM +0300, Andrey Borzenkov wrote: >=20 > > - exposing two knobs for the *same* thing confuses user level tools; yo= u never > > know which one is used and they compete behind your back >=20 > How do they compete? In my case user level program (kpowersave) decided to use video.ko for brightness control (or, may be, it used them both). Which gave me 2 levels instead of 8. And there is no way to control it, at least known to me. Have you looked at link I posted in previous message? > As I said, the implementations appear to be =20 > implemented on top of the same underlying functionality. I have no idea and do not care how it is implemented internally. The fact is, going via ACPI _BCM gives me 2 levels (three if zero counts). Going via proprietary HCI gives 8. > The problem =20 > with providing both vendor and ACPI functionality comes when both use=20 > different mechanisms for changing the backlight and so can get out of=20 > sync with each other. Are there any machines supported by toshiba_acpi=20 > where this is the case? >=20 Yes. Mine and Len's at least :) --nextPart1431708.EXrti5RfbD Content-Type: application/pgp-signature; name=signature.asc Content-Description: This is a digitally signed message part. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (GNU/Linux) iEYEABECAAYFAkke+UIACgkQR6LMutpd94xNygCcDn5DNbIGmhh0BcMqUqfyZPGM XssAoLT2IL2R7gfosblp7ja6vuKt1HiN =X9g9 -----END PGP SIGNATURE----- --nextPart1431708.EXrti5RfbD--