From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Eli Zaretskii Newsgroups: gmane.emacs.bugs Subject: bug#18912: 24.4; mode-line corruption on graphical frames in dual-headed display Date: Tue, 04 Nov 2014 17:56:12 +0200 Message-ID: <83tx2fufhf.fsf@gnu.org> References: <54524135.8090405@gnu.org> <8361ezz56z.fsf@gnu.org> <5454D7EB.6060407@gnu.org> <83sii3xecv.fsf@gnu.org> <5456A6FE.90108@gnu.org> <83tx2hvtwp.fsf@gnu.org> <54571ABB.7020000@gnu.org> <83ppd4w910.fsf@gnu.org> <5457E044.9080300@gnu.org> <83bnoovxpi.fsf@gnu.org> <83a948vxh6.fsf@gnu.org> <837fzcvwph.fsf@gnu.org> <5457ED37.5080807@gnu.org> <8338a0vv6w.fsf@gnu.org> <54586C9D.2000801@gnu.org> Reply-To: Eli Zaretskii NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8BIT X-Trace: ger.gmane.org 1415116646 2239 80.91.229.3 (4 Nov 2014 15:57:26 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Tue, 4 Nov 2014 15:57:26 +0000 (UTC) Cc: 18912@debbugs.gnu.org To: Bruno =?UTF-8?Q?F=C3=A9lix?= Rezende Ribeiro Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Tue Nov 04 16:57:19 2014 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1XlgTt-0004vJ-Ql for geb-bug-gnu-emacs@m.gmane.org; Tue, 04 Nov 2014 16:57:17 +0100 Original-Received: from localhost ([::1]:41328 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XlgTt-0002VW-CQ for geb-bug-gnu-emacs@m.gmane.org; Tue, 04 Nov 2014 10:57:17 -0500 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:37666) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XlgTk-0002UD-6c for bug-gnu-emacs@gnu.org; Tue, 04 Nov 2014 10:57:14 -0500 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1XlgTe-0006MQ-BH for bug-gnu-emacs@gnu.org; Tue, 04 Nov 2014 10:57:08 -0500 Original-Received: from debbugs.gnu.org ([140.186.70.43]:51752) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XlgTe-0006ML-8s for bug-gnu-emacs@gnu.org; Tue, 04 Nov 2014 10:57:02 -0500 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.80) (envelope-from ) id 1XlgTd-0000mL-Ib for bug-gnu-emacs@gnu.org; Tue, 04 Nov 2014 10:57:01 -0500 X-Loop: help-debbugs@gnu.org Resent-From: Eli Zaretskii Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Tue, 04 Nov 2014 15:57:01 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 18912 X-GNU-PR-Package: emacs X-GNU-PR-Keywords: Original-Received: via spool by 18912-submit@debbugs.gnu.org id=B18912.14151165842893 (code B ref 18912); Tue, 04 Nov 2014 15:57:01 +0000 Original-Received: (at 18912) by debbugs.gnu.org; 4 Nov 2014 15:56:24 +0000 Original-Received: from localhost ([127.0.0.1]:48965 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1XlgT1-0000kY-HS for submit@debbugs.gnu.org; Tue, 04 Nov 2014 10:56:23 -0500 Original-Received: from mtaout25.012.net.il ([80.179.55.181]:54410) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1XlgSy-0000kH-PJ for 18912@debbugs.gnu.org; Tue, 04 Nov 2014 10:56:22 -0500 Original-Received: from conversion-daemon.mtaout25.012.net.il by mtaout25.012.net.il (HyperSendmail v2007.08) id <0NEI00I00UJ2HH00@mtaout25.012.net.il> for 18912@debbugs.gnu.org; Tue, 04 Nov 2014 17:51:49 +0200 (IST) Original-Received: from HOME-C4E4A596F7 ([87.69.4.28]) by mtaout25.012.net.il (HyperSendmail v2007.08) with ESMTPA id <0NEI00D1LUQD6X60@mtaout25.012.net.il>; Tue, 04 Nov 2014 17:51:49 +0200 (IST) In-reply-to: <54586C9D.2000801@gnu.org> X-012-Sender: halo1@inter.net.il X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.15 Precedence: list X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x X-Received-From: 140.186.70.43 X-BeenThere: bug-gnu-emacs@gnu.org List-Id: "Bug reports for GNU Emacs, the Swiss army knife of text editors" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Original-Sender: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.bugs:95474 > Date: Tue, 04 Nov 2014 04:05:17 -0200 > From: Bruno Félix Rezende Ribeiro > CC: 18912@debbugs.gnu.org > > Eli Zaretskii wrote: > > Again identical. Looks like indeed it's some problem with your > > graphics card, because Emacs gets the same information in both cases: > > in both cases, only 1 pixel of the last line is visible. > > > > I'll try to think about additional tests, but meanwhile I suggest that > > you try lowering the level of the acceleration of your card, and see > > if that helps. > > Totally disabling acceleration by using the driver's option "NoAccel", > seems to fix the problem. Good. This seems to close the issue: the root cause is indeed some problem with your card/driver. It's not an Emacs bug. > The conclusion we reach is that it's not an Emacs bug, despite the fact > that this weirdness only manifests in Emacs. Emacs uses standard Xlib calls to draw its windows and communicate to X the dimensions to be used to clip partially visible lines. Any program that does the same will bump into the same issues. > So we came to the point where we actually find that it's not possible to > solve the bug, because it's beyond the realm of Emacs. It's not possible to solve it in Emacs, but not in general. Your card probably has firmware, which could be updated, and a device driver, which could be upgraded. I'd suggest to do that, if at all possible and practical. Or even replace the card with another one. > So I kindly ask you: please, provide a way to make Emacs optionally > redraw the mode-line after any scroll operation. ;-) I'm not yet convinced that Emacs can do _anything_ to provide a workaround for this problem. See my other messages as to why.