[trollkarlen]

Hi,
I just installed ubuntu 14.04 beta and it introduced serious tearing its always in the same place around 1/4 from top and seams to be lagging behind one or 2 frames. Like its taken from the wrong buffer(dubble buffered?).

It works OK in both VLC and mplayer with vdpau.

Here is some info:
Ubuntu 14.04 Beta 1
Xbmc 13.0-beta2 a1cab7a
Nvidia-331-49
Nvidia ION graphic

/T

[fritsch]

Use the forum search and disable backing store.

[trollkarlen]

I will put the fix here so its easier to find, and maybe non insane googlers can find it also.
To enable this if you use lightdm as i do add this line to your lightdm.conf(/etc/lightdm/lightdm.conf) :

Code:

xserver-command=X -bs

I tried disabling the composite in the xorg.conf also but it had no effect.

Why does it work in mplayer and VLC do they use other ways of drawing than xbmc ?

/T

[fritsch]

xbmc uses OpenGL and here SDL picks up the backing store automatically. Not an issue for non SDL/OpenGL applications.

[trollkarlen]

Thx fritsch!

/T

[paalfe]

http://askubuntu.com/a/450673/14551
https://bugs.launchpad.net/ubuntu/+sourc...omments/12

A workaround for ubuntu 14.04 with nvidia driver is to disable backing store in xorg: Make sure you have the "-bs" option in lightdm config file:

Code:

cat /usr/share/lightdm/lightdm.conf.d/50-xserver-command.conf

[SeatDefaults]
# Dump core
xserver-command=X -bs -core

------------------------------
If you're using another mechanism for starting X you can use the same flag in a similar way. For example, here's startx which is popularly used in XBMC (and other kiosk applications') startup scripts:

Code:

startx /etc/X11/Xsession /usr/bin/xbmc-standalone -- -bs

[fritsch]

Making the change to /usr/ is nothing you should do. That's plain overwritten without asking when distribution updates. Use for example something in /etc/lightdm/lightdm.conf.d/

e.g. 10-ubuntu.conf

Code:

[SeatDefaults]
xserver-command=/usr/bin/X -bs -nolisten tcp
user-session=ubuntu
allow-guest=false

[isamudaison]

Should the 'tearing problems on linux?' sticky post be updated with the backingstore info? I think I see these posts pop up more & more with the newest x server shipping w/ 14.04, and likely we'll keep seeing it.

[rodalpho]

This was patched on monday, run an update/upgrade and revert any changes you made with the backingstore.

https://bugs.launchpad.net/ubuntu/+sourc...ug/1280665

[moaltar]

Hi everyone,

I cant seem to get rid of this problem.

I tried adding -bs to the lightdm.conf.d and using the path in rodalpho's post.

I'm running Gotham 13.0, Ubuntu 14.04, and I have the latest nVidia drivers. This problem seemed to come after my last Ubuntu update.

[moaltar]

Nevermind, I think I fixed the problem. I was using the Aeon skin and it doesnt show a lot of the settings for video playback. I loaded up Confluence and checked the "match frame rate to tv" setting. That seemed to fix the problem for now.