Radeon Mobility X700

Hello all, I have troubles with my "Radeon Mobility X700" graphic card. Problem is usually during log-in/log-out when the screen become sometimes tripled. Usually helps shut down X ... CTRL+Alt+Backspace, sometimes I have to repeat this several times. grep "WW" /var/log/Xorg.0.log giving this output: (WW) RADEON(0): Failed to detect secondary monitor, MergedFB/Clone mode disabled (WW) RADEON(0): LVDS Info: (WW) AIGLX: 3D driver claims to not support visual 0x23 (WW) AIGLX: 3D driver claims to not support visual 0x24 (WW) AIGLX: 3D driver claims to not support visual 0x25 (WW) AIGLX: 3D driver claims to not support visual 0x26 (WW) AIGLX: 3D driver claims to not support visual 0x27 (WW) AIGLX: 3D driver claims to not support visual 0x28 (WW) AIGLX: 3D driver claims to not support visual 0x29 (WW) AIGLX: 3D driver claims to not support visual 0x2a (WW) AIGLX: 3D driver claims to not support visual 0x2b (WW) AIGLX: 3D driver claims to not support visual 0x2c (WW) AIGLX: 3D driver claims to not support visual 0x2d (WW) AIGLX: 3D driver claims to not support visual 0x2e (WW) AIGLX: 3D driver claims to not support visual 0x2f (WW) AIGLX: 3D driver claims to not support visual 0x30 (WW) AIGLX: 3D driver claims to not support visual 0x31 (WW) AIGLX: 3D driver claims to not support visual 0x32 I am using "ati" driver choosen in xorg.conf. After googling I've found that somebody using "fglrx" driver. Thanks for help