From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED.blaine.gmane.org!not-for-mail From: Bastian Beischer Newsgroups: gmane.emacs.bugs Subject: bug#38199: 27.0.50; [Cairo] Display artifacts (small vertical colored bars) Date: Thu, 14 Nov 2019 23:30:32 +0100 Message-ID: References: <87eeybd12v.fsf@bastian-desktop.i-did-not-set--mail-host-address--so-tickle-me> <83tv7660w8.fsf@gnu.org> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Injection-Info: blaine.gmane.org; posting-host="blaine.gmane.org:195.159.176.226"; logging-data="187650"; mail-complaints-to="usenet@blaine.gmane.org" Cc: 38199@debbugs.gnu.org To: Eli Zaretskii Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Thu Nov 14 23:31:26 2019 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([209.51.188.17]) by blaine.gmane.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.89) (envelope-from ) id 1iVNe9-000mhi-Vw for geb-bug-gnu-emacs@m.gmane.org; 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Thu, 14 Nov 2019 14:30:43 -0800 (PST) In-Reply-To: <83tv7660w8.fsf@gnu.org> X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.51.188.43 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" Xref: news.gmane.org gmane.emacs.bugs:171616 Archived-At: On Thu, Nov 14, 2019 at 2:30 PM Eli Zaretskii wrote: > > > From: Bastian Beischer > > Date: Wed, 13 Nov 2019 20:32:24 +0100 > > > > When emacs is built with cairo I see small display artifacts from time > > to time, in particular there are small thin vertical bars, for example, > > with the default theme (starting from emacs -Q) I get those bars in the > > mode-line and they are always in a cyan color, but it is possible that > > other occurences can be observed even with emacs -Q. > > > > In real world usage I have seen these bars in regular buffers, too, > > usually they are red and/or blue but that might depend on my theme. > > > > A recipe to produce them (on my machine) is: > > > > 1) emacs -Q > > 2) M-< > > 3) C-space > > 4) M-> > > 5) M-w > > 6) C-y (repeat ten or twenty times) > > > > Then move around in the resulting buffer and after a bit of cursor > > movement the vertical lines appear. They are not permanent and often > > disappear when the buffer is refreshed. > > Did you try to disable "advanced" or "optimization" features of your > display driver software? Or upgrade it to a newer version? The > artifacts your screenshot shows don't look like something Emacs could > produce. You are right: It could well be a cairo library or driver issue. I am using the default optimized builds from the Arch Linux x86_64 repository, which means: cairo: 1.17.2+17+g52a7c79fd-2 Xorg: 1.20.5-4 mesa: 19.2.3-2 linux: 5.3.11.1-1 My GPU is NVIDIA Geforce GTX 285 (nouveau kernel driver, combined with modesetting / glamor). Should I report a bug against cairo? > > Can someone else reproduce this in a Cairo build? > > Thanks.