From owner-freebsd-multimedia Sun Apr 19 18:15:35 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id SAA29774 for freebsd-multimedia-outgoing; Sun, 19 Apr 1998 18:15:35 -0700 (PDT) (envelope-from owner-freebsd-multimedia@FreeBSD.ORG) Received: from rah.star-gate.com (rah.star-gate.com [209.133.7.234]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id BAA29768 for ; Mon, 20 Apr 1998 01:15:34 GMT (envelope-from hasty@rah.star-gate.com) Received: from rah.star-gate.com (localhost.star-gate.com [127.0.0.1]) by rah.star-gate.com (8.8.8/8.8.8) with ESMTP id SAA00408; Sun, 19 Apr 1998 18:15:26 -0700 (PDT) (envelope-from hasty@rah.star-gate.com) Message-Id: <199804200115.SAA00408@rah.star-gate.com> X-Mailer: exmh version 2.0.2 2/24/98 To: Doug White cc: Luigi Rizzo , multimedia@FreeBSD.ORG Subject: Brightness in Bt848 vs Meteor In-reply-to: Your message of "Fri, 17 Apr 1998 15:29:31 PDT." Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Date: Sun, 19 Apr 1998 18:15:26 -0700 From: Amancio Hasty Sender: owner-freebsd-multimedia@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org The Meteor's brightness value is unsigned ranging from 0 to 255 and the Bt848 uses signed (-128 to 127) where -128 is -50% of full scale and +127 is +49.6%. The Bt848 driver has an ioctl to control brightness for the meteor and the bt848 . The Bt848 driver's matrox meteor brightness ioctl has been modified to convert the value from unsigned to signed. Applications such as fxtv will not be affected given that they use the bt848 native ioctl call. The next driver rev will be released in about 2 days. Amancio To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-multimedia" in the body of the message