LinuxQuestions.org - Xorg segfault problem

I am having the next problem, when i am in firefox and opening webpages,(Firefox is the application i most use, but it could happend with other applications) sometimes it happend when i go to youtube or search something, or try to open a link, randomly my x11 reboot it self, i do not think it is the firefox, it must be another thing, i have seen my /var/log/messages and i have these lines:

Quote:

kernel: Xorg[2558]: segfault at 1b8 ip 54e4b5 sp 7fff577f54a0 error 4 in Xorg[400000+1c0000]
kdm[2506]: X server for display :0 terminated unexpectedly
kernel: mtrr: type mismatch for e0000000,10000000 old: write-back new: write-combining
kernel: set status page addr 0x01f7f000
kernel: CPU0 attaching NULL sched-domain.
kernel: CPU1 attaching NULL sched-domain.
kernel: CPU0 attaching sched-domain:
kernel: domain 0: span 00000000,00000000,00000000,00000003
kernel: groups: 00000000,00000000,00000000,00000001 00000000,00000000,00000000,00000002
kernel: domain 1: span 00000000,00000000,00000000,00000003
kernel: groups: 00000000,00000000,00000000,00000003
kernel: CPU1 attaching sched-domain:
kernel: domain 0: span 00000000,00000000,00000000,00000003
kernel: groups: 00000000,00000000,00000000,00000002 00000000,00000000,00000000,00000001
kernel: domain 1: span 00000000,00000000,00000000,00000003
kernel: groups: 00000000,00000000,00000000,00000003

I am trying to find the problem, i found differents things in google, but still now i haven found what is happening, some of then said it is because of lack memory, i have 4GB in phisical and 2Gb in swap. The only coincidence i have found is that it is happening with Intel Video Cards, I still not known why, I have Intel ideo card and that can be the source of the problem but i still have not found how to solve it.

I have tried the UXA AccelMethod but it does not seem to be the problem. I have tried to deactivate the compiz and the problem is still there. Is not something good to be working and at some point the X11 break it self and login again to start again and try to recover what i was doing.