problem with grafic driver on F22 KDE i686

[gil]

hi
sometimes the pc freeze with a black screen on F22 kde i686
i *must* use the power button other way are no possible for me
xorg.log https://gil.fedorapeople.org/xorg-9-log.txt
Konsole outpu<br> journalctl journalctl 
https://gil.fedorapeople.org/journal-debug.txt
i tried to add a script (as I was advised to do the channel #fedora-kde)
in /etc/xdg/plasma-workspace/env that contains:
QT_XCB_FORCE_SOFTWARE_OPENGL=1
export QT_XCB_FORCE_SOFTWARE_OPENGL
after i tried with
LIBGL_ALWAYS_SOFTWARE instead of QT_XCB_FORCE_SOFTWARE_OPENGL
but seem don't work
any ideas?
(n.b. i don't want use the rpmfusion stuff)
thanks in advance
regards
gil

Konsole output
lspci|grep -i vga
04:00.0 VGAcompatible controller: NVIDIA Corporation GT216 [GeForce GT 
220] (rev a2)

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.fedoraproject.org/pipermail/devel/attachments/20150710/7f7941e2/attachment.html>