framebuffer console no longer understand escape chars

Hi, List These days I was playing with some kernel configurations on a 3.1x ARM linux. I remembered, last week I can do 'echo "\033[2J" > /dev/tty0' to clear my framebuffer LCD screen, since I have enabled framebuffer console option in kernel. But today, I cannot not get the same result by doing so. Only the literal "\033[2J" was printed on the screen. Also I cannot make the screen scrolls by doing something like "dmesg > /dev/tty0". I know I have changed some options in kernel configuration for some other purpose, but I don't what changes can change this thing. Please someone be so kind to sort me out. Thanks in advance! -- I can't go back to yesterday - because I was a different person then