When 'enable_off_mode' is 0, the target power state for MPU and Core is locally changed to PWRDM_POWER_RET but, the statistics are updated for idle state originally selected by the governor. To debug the issue and validate the fix, added variables - mpu_state_modified and core_state_modified. Both are incremented in omap3_enter_idle() as below: if (!enable_off_mode) { if (mpu_state < PWRDM_POWER_RET) { mpu_state_modified++; mpu_state = PWRDM_POWER_RET; } if (core_state < PWRDM_POWER_RET) { core_state_modified++; core_state = PWRDM_POWER_RET; } } Also added a sysfs entry to track these modifications. Before the change: ...BOOT... [root@OMAP3EVM /]# [root@OMAP3EVM /]# cat /sys/power/enable_off_mode 0 [root@OMAP3EVM /]# cat /sys/power/enable_off_mode 0 [root@OMAP3EVM /]# cat /sys/power/track_modifs [mpu_state_modified, core_state_modified] = [0 , 0] [root@OMAP3EVM /]# [root@OMAP3EVM /]# [root@OMAP3EVM /]# echo 1 > /sys/power/sleep_while_idle [root@OMAP3EVM /]# ...WAIT 5 SECS... [root@OMAP3EVM /]# cat /sys/power/track_modifs [mpu_state_modified, core_state_modified] = [5 , 3] [root@OMAP3EVM /]# cat /sys/devices/system/cpu/cpu0/cpuidle/state6/usage 3 ...WAIT FEW MORE SECS... [root@OMAP3EVM /]# cat /sys/power/track_modifs [mpu_state_modified, core_state_modified] = [27 , 25] [root@OMAP3EVM /]# cat /sys/devices/system/cpu/cpu0/cpuidle/state6/usage 25 [root@OMAP3EVM /]# cat /sys/power/enable_off_mode 0 After the fix: ...BOOT... [root@OMAP3EVM /]# [root@OMAP3EVM /]# cat /sys/power/enable_off_mode 0 [root@OMAP3EVM /]# cat /sys/power/enable_off_mode 0 [root@OMAP3EVM /]# cat /sys/power/track_modifs [mpu_state_modified, core_state_modified] = [0 , 0] [root@OMAP3EVM /]# [root@OMAP3EVM /]# [root@OMAP3EVM /]# echo 1 > /sys/power/sleep_while_idle [root@OMAP3EVM /]# ...WAIT 5 SECS... [root@OMAP3EVM /]# cat /sys/power/track_modifs [mpu_state_modified, core_state_modified] = [0 , 0] [root@OMAP3EVM /]# cat /sys/devices/system/cpu/cpu0/cpuidle/state6/usage 0 [root@OMAP3EVM /]# echo 1 > /sys/power/sleep_while_idle [root@OMAP3EVM /]# ...WAIT APPROX 10 SECS... [root@OMAP3EVM /]# cat /sys/power/track_modifs [mpu_state_modified, core_state_modified] = [0 , 0] [root@OMAP3EVM /]# cat /sys/devices/system/cpu/cpu0/cpuidle/state6/usage 2 ...WAIT APPROX 30 SECS... [root@OMAP3EVM /]# cat /sys/power/track_modifs [mpu_state_modified, core_state_modified] = [0 , 0] [root@OMAP3EVM /]# cat /sys/devices/system/cpu/cpu0/cpuidle/state6/usage 17 [root@OMAP3EVM /]# This topic was discussed earlier; but the final fix did not find its way back. [1] http://marc.info/?l=linux-omap&m=123681603821299&w=2 Sanjeev Premi (1): PM : cpuidle - update statistics for correct state arch/arm/mach-omap2/cpuidle34xx.c | 34 +++++++++++++++++++++++++++------- arch/arm/mach-omap2/pm.h | 2 ++ arch/arm/mach-omap2/pm34xx.c | 2 ++ 3 files changed, 31 insertions(+), 7 deletions(-) -- 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