In my code i've made a typo error, i was trying to draw a line with 
glBegin(GL_LINE) instead of GL_LINES.

There is no error with dri driver, but nvidia/fglrx drivers raise an error 
(GL_ENUM)

glxinfo :
OpenGL vendor string: Tungsten Graphics, Inc.
OpenGL renderer string: Mesa DRI R200 20041207 AGP 1x TCL
OpenGL version string: 1.3 Mesa 6.4.1

on kubuntu dapper