Fwd: Freeze due to Xorg server??

[Antonio M]

A friend of mine has installed F12 (that has been fully updated) on
her AMD system with Radeon graphic card, but she js experiencing some
freezes randomly.
So she added some option to grub and situation greatly improved, but
sometimes during operation system locks

default=0
timeout=10

splashimage=(hd0,5)/grub/splash.xpm.gz

hiddenmenu

title Fedora (2.6.31.12-174.2.3.fc12.i686.PAE)
   root (hd0,5)
   kernel /vmlinuz-2.6.31.12-174.2.3.fc12.i686.PAE ro
root=/dev/mapper/vg_lella-lv_root  LANG=it_IT.UTF-8
SYSFONT=latarcyrheb-sun16 KEYBOARDTYPE=pc KEYTABLE=it rhgb quiet
noacpi nomodeset
   initrd /initramfs-2.6.31.12-174.2.3.fc12.i686.PAE.img


I suspect that something is wrong with Xorg, so I got from her by
e-mail all Xorg log files, that are attached.
I can't understand why thereis a Xorg.0.old.log file that is empty, anyway
can someone have  a look  to these logs and comment them?

Tnx for help
--
Antonio Montagnani
Skype : antoniomontag
SIP: antoniomontag(a)ekiga.net