You need to use userspace governor before trying to set speed using scalling_setspeed. Can you pls confirm that? You can select userspace governor by using below command echo userspace > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor Vishwa -----Original Message----- From: linux-omap-owner@xxxxxxxxxxxxxxx [mailto:linux-omap-owner@xxxxxxxxxxxxxxx] On Behalf Of tarek attia Sent: Tuesday, November 17, 2009 10:28 PM To: linux-omap Subject: Scalling_setspeed doesn't work When I try to change the value of (scalling_setspeed) file ,it doesn't change however it doesn't rise errors as well,,but after changing it and trying to rereading it ,I found that nothing is changed !!!????????? BTW:-I'm using Linux kernel(2.6.29) on the beagleboard with the power management branch Any help will be appreciated . Best Regards, tarek -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html