AntiAliase can't work on my computer, but can on another!

In my program, i use antialiase code such as “glEnable(GL_LINE_SMOOTH)”,but after antialiase, the render result of the program was same as before, but when I run the same program on another computer, the result is obviously better than before.
Why? Please help me to find the problem. thanks!my graphic driver is SIS, not NV.

IIRC, It’s really up to the vendor, how and if they implement anti-aliasing.

Some cards will just ignore the instruction (usually cheaper cards).