From mboxrd@z Thu Jan 1 00:00:00 1970 From: Adam Jackson Subject: Re: -next queue and EDID stuff Date: Mon, 27 Aug 2012 16:47:50 -0400 Message-ID: <503BDCF6.5020607@redhat.com> References: <503BD762.6070204@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; Format="flowed" Content-Transfer-Encoding: 7bit Return-path: Received: from mx1.redhat.com (mx1.redhat.com [209.132.183.28]) by gabe.freedesktop.org (Postfix) with ESMTP id 5132C9F0BB for ; Mon, 27 Aug 2012 13:47:52 -0700 (PDT) In-Reply-To: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: dri-devel-bounces+sf-dri-devel=m.gmane.org@lists.freedesktop.org Errors-To: dri-devel-bounces+sf-dri-devel=m.gmane.org@lists.freedesktop.org To: Alex Deucher Cc: dri-devel List-Id: dri-devel@lists.freedesktop.org On 8/27/12 4:34 PM, Alex Deucher wrote: > On Mon, Aug 27, 2012 at 4:24 PM, Adam Jackson wrote: >> Paul's FORCE_REDUCED_BLANKING series makes me nervous about what those >> monitors will do over VGA, since from a conversation we had on IRC he hasn't >> been able to test that. > > I asked the closed driver display team about these to see if we had > any generic rules for whole classes of monitors and they do not. They > keep a small database of displays that need special tweaking and then > have a set of options that can be enabled by the user (always use > CVT-RB rather than GTF, etc.). There's no generic solution since EDID > 1.3 doesn't give us enough info to really enable generic rules on > whole classes of monitors and most VGA connectors still use EDID 1.3 > with no extension blocks. EDID 1.4 is better, but few VGA connectors > on monitors uses it. Other than that, they also rely on the EDID. I really wish there were a useful way to identify the display controller on the other end. DDC/CI will give it to you, kind of, but any monitor that supports CI probably doesn't need quirking, at least not at this level. Paul's series does pick specific vendor/model IDs as much as it can, but when the model is "0" one is a little wary about whether the vendor bothers to set the model ID meaningfully at all. - ajax