Debian Bug report logs - #747168
libsdl1.2 always uses backingstore which causes tearing in modern X servers

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Message #5 received at submit@bugs.debian.org (full text, mbox, reply):

From: Timo Jyrinki <timo@debian.org>

To: Debian Bug Tracking System <submit@bugs.debian.org>

Subject: libsdl1.2 always uses backingstore which causes tearing in modern X servers

Date: Tue, 06 May 2014 10:11:13 +0300

[Message part 1 (text/plain, inline)]

Source: libsdl1.2
Severity: normal
Tags: upstream patch

Dear Maintainer,

Current upstream version causes visible tearing in eg. videos when 
using a modern X.org with composite version.

The easiest way to reproduce:
apt-get install xbmc youtube-dl
youtube-dl http://www.youtube.com/watch?v=22ftfoCSPQI
xbmc # open the video

Without the patch tearing is visible regardless of vsync settings, 
while with the patch the image is tear-free (like before).

Upstream bug report is at:
https://bugzilla.libsdl.org/show_bug.cgi?id=2383

As explained there, upstream is not planning another 1.2 release, and 
the 2.0 does not have the problem. Meanwhile, Fedora [1] and Ubuntu [2] 
have applied a patch to not unconditionally enable backingstore, restoring 
the old behavior. I'd suggest a similar patch for Debian.

[1] https://bugzilla.redhat.com/show_bug.cgi?id=1073057
[2] https://bugs.launchpad.net/ubuntu/+source/libsdl1.2/+bug/1280665

-- System Information:
Debian Release: jessie/sid
  APT prefers unstable
  APT policy: (500, 'unstable')
Architecture: i386 (i686)

Kernel: Linux 3.13-1-686-pae (SMP w/1 CPU core)
Locale: LANG=fi_FI.UTF-8, LC_CTYPE=fi_FI.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash

[sdl-check-for-SDL_VIDEO_X11_BACKINGSTORE.patch (text/x-diff, attachment)]

Message #10 received at 747168@bugs.debian.org (full text, mbox, reply):

From: Dominique Dumont <dod@debian.org>

To: 747168@bugs.debian.org

Cc: Timo Jyrinki <timo@debian.org>

Subject: Re: libsdl1.2 always uses backingstore which causes tearing in modern X servers

Date: Sun, 11 May 2014 18:57:28 +0200

[Message part 1 (text/plain, inline)]

I can confirm tearing on XBMC, nvidia (with proprietary driver).

But the proposed patch does not resolve this issue on my system.

Timo, what is your HW setup  and Xorg driver ?

All the best

-- 
 https://github.com/dod38fr/   -o- http://search.cpan.org/~ddumont/
http://ddumont.wordpress.com/  -o-   irc: dod at irc.debian.org

[Message part 2 (text/html, inline)]

Message #15 received at 747168@bugs.debian.org (full text, mbox, reply):

From: Timo Jyrinki <timo.jyrinki@iki.fi>

To: dod@debian.org

Cc: 747168@bugs.debian.org

Subject: Re: libsdl1.2 always uses backingstore which causes tearing in modern X servers

Date: Thu, 15 May 2014 14:19:07 +0300

11.05.2014 19:57, Dominique Dumont kirjoitti:
>
> I can confirm tearing on XBMC, nvidia (with proprietary driver).
>
>  
>
> But the proposed patch does not resolve this issue on my system.
>
>  
>
> Timo, what is your HW setup and Xorg driver ?
>
I've various Intel graphics hardware systems, but the identically titled
Ubuntu bug report [1] has success stories also from nvidia users. I just
re-tested on one machine with a fresh Jessie install that the tearing
happens with the test video very visibly when following my steps to
reproduce. After a recompile of libsdl1.2 with the patch added to
debian/patches(/series), the tearing is gone in xbmc.

[1] https://launchpad.net/bugs/1280665

-Timo

Message #20 received at 747168@bugs.debian.org (full text, mbox, reply):

From: David Swegen <dswegen@gmail.com>

To: 747168@bugs.debian.org

Subject: Workaround

Date: Fri, 20 Jun 2014 15:13:51 +0100

Until there is an updated package this issue can be worked around by
passing in -bs to the xserver in the appropriate file.

Cheers
   David

Message #33 received at 747168-close@bugs.debian.org (full text, mbox, reply):

From: Felix Geyer <fgeyer@debian.org>

To: 747168-close@bugs.debian.org

Subject: Bug#747168: fixed in libsdl1.2 1.2.15-10

Date: Mon, 30 Jun 2014 19:49:03 +0000

Source: libsdl1.2
Source-Version: 1.2.15-10

We believe that the bug you reported is fixed in the latest version of
libsdl1.2, which is due to be installed in the Debian FTP archive.

A summary of the changes between this version and the previous one is
attached.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to 747168@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Felix Geyer <fgeyer@debian.org> (supplier of updated libsdl1.2 package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmaster@ftp-master.debian.org)


-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

Format: 1.8
Date: Mon, 30 Jun 2014 21:18:45 +0200
Source: libsdl1.2
Binary: libsdl1.2debian libsdl1.2-dev libsdl1.2-dbg
Architecture: source amd64
Version: 1.2.15-10
Distribution: unstable
Urgency: medium
Maintainer: Debian SDL packages maintainers <pkg-sdl-maintainers@lists.alioth.debian.org>
Changed-By: Felix Geyer <fgeyer@debian.org>
Description:
 libsdl1.2-dbg - Simple DirectMedia Layer debug files
 libsdl1.2-dev - Simple DirectMedia Layer development files
 libsdl1.2debian - Simple DirectMedia Layer
Closes: 747168 751765
Changes:
 libsdl1.2 (1.2.15-10) unstable; urgency=medium
 .
   [ Hector Oron ]
   * d/control: remove libts-dev dependency. (Closes: #751765)
 .
   [ Felix Geyer ]
   * Enable X11 backingstore only when SDL_VIDEO_X11_BACKINGSTORE is set to
     prevent tearing. (Closes: #747168)
     - Add sdl-check-for-SDL_VIDEO_X11_BACKINGSTORE.patch
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 79c62066192373f90134fed8d7be01e668839d7a 22796 libsdl1.2_1.2.15-10.debian.tar.xz
 5a6e5a2672c4463f85ef116f84d06d5009845a2e 187252 libsdl1.2debian_1.2.15-10_amd64.deb
 d5426bd4328bf6c21b5c9c927c557c5eab072346 730734 libsdl1.2-dev_1.2.15-10_amd64.deb
 0304eb9a11956df0b5c0548260ef77e3616d59d9 746562 libsdl1.2-dbg_1.2.15-10_amd64.deb
Checksums-Sha256:
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 94e158710e2ad389d65e6cdce9e10be2a15e20125dfcbc34c9d4a4f0f098a36e 22796 libsdl1.2_1.2.15-10.debian.tar.xz
 148a9cf14cbb9cfb8efec989107e69b756bea67916501edda24378931ac3cb34 187252 libsdl1.2debian_1.2.15-10_amd64.deb
 6270390ef890f401e5ea40be126b17329e8d64a29f872b4a1e47d0b17b12f25c 730734 libsdl1.2-dev_1.2.15-10_amd64.deb
 c894ad07a1bc0d1566c8bee29414b2b3613a1af0ee8f9a239d6cd2c71ab07983 746562 libsdl1.2-dbg_1.2.15-10_amd64.deb
Files:
 a8df09a166702cd95d82558d50e4f7e9 187252 libs optional libsdl1.2debian_1.2.15-10_amd64.deb
 4f2dcc93393bbecbd439b29f140f24e0 730734 libdevel optional libsdl1.2-dev_1.2.15-10_amd64.deb
 9d830eb1fd1ac6cfeaa4d0546c6d0219 746562 debug extra libsdl1.2-dbg_1.2.15-10_amd64.deb
 96611f10f233a5d22b823135424f006d 2452 libs optional libsdl1.2_1.2.15-10.dsc
 f1cb91302791c35be3e874c73f9f3f9b 22796 libs optional libsdl1.2_1.2.15-10.debian.tar.xz

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