Same here with a Barton core Athlon XP Mobile 2400+ that should have 1800 Mhz more or less and /proc/cpuinfo gives 1473 Mhz.
kernel: 2.6.17-11-generic -- /proc/cpuinfo reports wrong frequeny for AMD Athlon XP 3000+ https://launchpad.net/bugs/71772 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
