I have deactivated the GLX support, from LibreOffice, and it doesn't deactivate GLX support at all, still moving the slides it's difficult with GLX activating, almost X frozen...
But if i deactivate GLX module from xorg.conf file, LibreOffice works better...
using radeon opensource driver.
Name : xorg-x11-drv-ati
Arch : x86_64
Version : 6.13.1
Release : 0.3.20100705git37b348059.fc14
Size : 1.1 M
Repositorio : installed
From repo : fedora
Summary : Xorg X11 ati video driver
URL : http://www.x.org
License : MIT
Descripción :X.Org X11 ati video driver.
[maximi89@localhost /]$ uname -a
Linux localhost.localdomain 188.8.131.52-48.fc14.x86_64 #1 SMP Fri Oct 22 15:36:08 UTC 2010 x86_64 x86_64 x86_64 GNU/Linux
Bug related https://bugs.freedesktop.org/show_bug.cgi?id=31446
Sorry, my mistake in this case, it was a problem of "antialising", it's not working with opensource drivers... it produces a laggy X server, i will close this, there is another bug open: