From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by yocto-www.yoctoproject.org (Postfix, from userid 118) id 5C5F0E008BC; Fri, 13 Feb 2015 00:45:51 -0800 (PST) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on yocto-www.yoctoproject.org X-Spam-Level: X-Spam-Status: No, score=-2.7 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, FREEMAIL_FROM, RCVD_IN_DNSWL_LOW autolearn=ham version=3.3.1 X-Spam-HAM-Report: * 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider * (picmaster[at]mail.bg) * -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1% * [score: 0.0000] * -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's * domain * 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily * valid * -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature * -0.7 RCVD_IN_DNSWL_LOW RBL: Sender listed at http://www.dnswl.org/, low * trust * [193.201.172.118 listed in list.dnswl.org] Received: from mx2.mail.bg (mx2.mail.bg [193.201.172.118]) by yocto-www.yoctoproject.org (Postfix) with ESMTP id AD7CBE00824 for ; Fri, 13 Feb 2015 00:45:46 -0800 (PST) Received: from [192.168.0.40] (unknown [93.152.143.60]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mx2.mail.bg (Postfix) with ESMTPSA id 60F6360008AB; Fri, 13 Feb 2015 10:45:43 +0200 (EET) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=mail.bg; s=default; t=1423817144; bh=EiF3DZwY35QdPWzXXxpygyl4iTGXEgRBPcJv9s4hEyc=; h=Message-ID:Date:From:MIME-Version:To:CC:Subject:References: In-Reply-To:Content-Type:Content-Transfer-Encoding; b=nhUkPPYv/rq2Ex4tyq3Q3AZ8Vf6FAOmkrqT4NpRqCBH+VvyvTYsecj1wd1geH4p+R p/Qz0OGiJJomo8zOfOd86sYOpRl+VzSV3ffHpHMnCcDUjzDcFkeIUuxq0Tn/0Dj+iU GfEEdFpyiZ8o/IhuqySNmxaShOOclUuCQf5vrxss= Message-ID: <54DDB9B6.5060204@mail.bg> Date: Fri, 13 Feb 2015 10:45:42 +0200 From: Nikolay Dimitrov User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Icedove/31.4.0 MIME-Version: 1.0 To: "carlos.casillas@freescale.com" References: In-Reply-To: Cc: "meta-freescale@yoctoproject.org" Subject: Re: display mirror Linux 3.10.53 X-BeenThere: meta-freescale@yoctoproject.org X-Mailman-Version: 2.1.13 Precedence: list List-Id: Usage and development list for the meta-fsl-* layers List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 13 Feb 2015 08:45:51 -0000 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 8bit Hi Carlos, On 02/13/2015 03:05 AM, carlos.casillas@freescale.com wrote: > Hello all, > > Some customers are asking for how to mirror the LCD screen (LVDS) on a > HDMI display. > > I have reached and I found many references about enabling a secondary > frame buffer and then a echo and dd on it; however, the secondary screen > is corrupted (has a different resolution). When using two LVDS screens, > the secondary screen is shown properly, but just the frame shown when > the dd command was called is printed. > > Does anyone know how to dynamically “clone” the primary screen (LVDS) on > a HDMI display (either on boot time or user space)? Xorg supports display cloning, but copying graphics data to the cloned display will consume some bus bandwidth even if DMA is used. This can add significant load to designs using low-budget memory subsystems. Also, I'm not sure whether the VPU-accelerated video playback will be handled across the cloned displays :(. Regards, Nikolay