It doesn't help :/

xorg.conf

ColorTilling "false"
ColorTilling2D "false"

Maybe I'm doing something wrong?

modprobe fglrx
radeonreg reg radeon > fglrx_reg_dump_console.log
start x
radeonreg reg radeon > fglrx_reg_dump_x11.log

restart computer

modprobe radeon
radeonreg reg radeon > radeon_reg_dump_console.log

./diff_and_select select_registers.txt > selected_registers.txt #script that
generate diff and select only registers from comment#13

./set_registers selected_registers.txt #script read selected_registers.txt and
execute radeonreg regset "register" "register_value"