--- p4-clockmod.c.org	2009-12-24 14:13:12.000000000 +0900
+++ p4-clockmod.c	2009-12-24 13:34:13.000000000 +0900
@@ -160,6 +160,8 @@
 		switch (c->x86_model) {
 		case 0x0E: /* Core */
 		case 0x0F: /* Core Duo */
+		case 0x16: /* Celeron Core */
+		case 0x1C: /* Atom */
 			p4clockmod_driver.flags |= CPUFREQ_CONST_LOOPS;
 			return speedstep_get_processor_frequency(SPEEDSTEP_PROCESSOR_PCORE);
 		case 0x0D: /* Pentium M (Dothan) */