Bug 520786 – media-libs/libsdl - image tearing arising from use of composite backingstore

• Product: Gentoo Linux
• Status: RESOLVED FIXED

[Description BobbyK 2014-08-24 18:52:27 UTC]

Created attachment 383540 [details, diff]
SDL backingstore on demand patch

There's a bunch of reports for other distros (e.g. Ubuntu https://bugs.launchpad.net/ubuntu/+source/libsdl1.2/+bug/1280665, Fedora https://bugzilla.redhat.com/show_bug.cgi?id=1073057, Arch https://aur.archlinux.org/packages/sdl-nobackingstore/) relating to this and a straighforward patch that fixed it for me (attached as backingstore_on_demand.patch).  Was wondering if Gentoo could include the same (or similar fix).

[Comment 1 Chris Mayo 2014-09-29 18:29:24 UTC]

Some more links with background:

https://devtalk.nvidia.com/default/topic/679688/tearing-in-sdl-1-2-apps-unless-composite-extension-is-completely-disabled-/
https://bugzilla.libsdl.org/show_bug.cgi?id=2383
https://www.libreoffice.org/bugzilla/show_bug.cgi?id=74158


Critical for XBMC:

http://forum.xbmc.org/showthread.php?tid=190655
http://forum.xbmc.org/showthread.php?tid=199765

Includes starting X with -bs to avoid it completely.

[Comment 2 James 2014-10-28 06:40:37 UTC]

I'd just like to add my input and say that I've been hit by this bug too.  I just spent the last two hours trying to fix vsync/tearing issues with xbmc and i965 - and the fix was this backingstore patch..  Running a patched version of libsdl fixed it for me.  Please add the patch to the tree if it doesn't break anything else.

[Comment 3 Pacho Ramos 2023-05-27 14:41:06 UTC]

Can you retry with 1.2.64 version please? Thanks

[Comment 4 James 2023-05-27 16:27:22 UTC]

Works fine on version 1.2.60 and 1.2.64.

[Comment 5 James Le Cuirot 2023-05-27 17:01:40 UTC]

Thanks for confirming.