Ubuntu 9.10 + XBMC + NVidia ION Sync to VBlank issue

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Posted by philou on Sunday, November 15. 2009 at 18:51

Ubuntu 9.10 + XBMC + NVidia ION Sync to VBlank issue

Some weeks ago, I've installed an Ubuntu 9.04 on my homemade HTPC based on a Atom 330 and Nvidia ION GPU. I was running nvidia 180 drivers along with XBMC to decode full hd streams using VDPAU hardware acceleration.

This friday, I've updated Ubuntu to 9.10 (karmic), nvidia drivers were automatically updated to the 185 version. I've also updated to the last XBMC version that is supposed to support karmic (9.11~alpha2-karmic1).

Unfortunately, the video playback is not synced to vblank anymore. Viewing anything that moves in these conditions leads to serious headaches.

The only solution I found is to disable compositing (fancy UI effects of the crappy Gnome desktop) by putting this in my xorg.conf file:



Section "Extensions"

    Option "Composite" "Disable"

EndSection

The issue is not really solved: the syncing is better but not perfect, the "split" artifact is now at the upper border of the image (approx 5%) and thus is not visible unless I look specifically at it.

So if you have the same setup (ION+ubuntu 9.04+XBMC) do not upgrade to 9.10 as there is currently no XBMC version that is fully compatible without compromises.

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"thus is not visible unless I look specifically at it."

I tried closing a bugs once mentionning that it was "not visible unless you look at it". Did not work very well.

#1 pht on 2009-11-17 09:52 (Reply)

lol !

#1.1 philou on 2009-11-17 09:56 (Reply)

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