Windows 10: CPU consumed by ExWaitForRundownProtectionRelease in idle state

Hi,I'm having a problem with CPU usage due to this blockage while the computer goes into idle mode about 5 minutes after the mouse stops moving. It consumes only 4% of the processor, but consumes as much as 20W of power. The problem with WaitFor does not occur when the computer is used normally, only after 5 minutes of resting. The power graph shows that in the idle state the computer periodically consumes more and less power, it is clearly visible that these are not extra processes, but only this blockage, because the periods are equal. I don't know how to debug what process/driver is using

:)

 

CPU not changing speed during idle state

I recently bought this Acer Aspire 5 a515 51g laptop and it was preloaded with windows 10 home edition single language. The specs of my laptop is as follows:

CPU- i5 8th gen 8250U 1.60~1.80GHZ (boost to 3.4ghz)

GPU- NVidia GeForce Mx150

Display- 15.6inch 16:9 1366x768

HDD- 1tb wd 5400rpm

RAM- 8gb ddr4

SSD- none

OS(current)- Windows 10 home single language (version- 1709, build- 16299.309)

Earlier it used to give me 5-6 hours of average battery life when I’m running on battery saver mode, that said I also used to tune down unnecessary things such as cpu max power consumption level to 99% on battery, brightness to minimum, disabled background
apps and turning on the battery saver. I noticed that even on battery saver with power limit to 75% the cpu would go up to 1.57-1.61ghz on peak requirements (although not necessarily cpu load being 100%, I’m talking about watching videos browsing copying stuffs
etc.), it’d go up to 3.3ghz or so under stress and when idle it’d automatically tune itself down to around 0.80ghz or 0.50ghz thus saving power. Now after a recent update of windows, I found out that the average battery life has gone down by more than an hour
or so, now it shows an average battery life of 4hr30mins to 5hr15mins after a full charge with the same settings. I also noticed that even in the idle state the cpu wouldn’t undervolt itself and it remains at its peak power state i.e. at 1.57-1.61ghz at 75%
power. I suspect that there’s some hidden service or app that was added after the update that requests the cpu to run at its peak clock. The interesting thing is that the cpu load at idle is 0-1%. I couldn’t find any app which is consuming the cpu that is
making it run at its peak clock. This is affecting my battery life. Has anyone any idea to what it might be and its possible fix? I’ve already tried bios- there’s no option to tweak the cpu over there. I’m currently running the cpu at 10%(0.40ghz) power state
to conserve battery for my casual works which includes writing, browsing and watching videos, but it’s kind of sluggish at times when I open too many tabs or switch between apps or run any big sized video. Earlier I wouldn’t have to worry about it because
the cpu would automatically ramp itself up to its needs and tune down during casual stuffs to conserve the battery. It’s not the same experience anymore. Any suggestion will be helpful. Thank you.

 

System Idle Process CPU Allocation?

Hi,

I am Sumit, an Independent advisor and a Microsoft MVP here to help.

System Idle Process, as the name suggests is a process that indicates CPU is idle and is not being used, aka is at rest. This is done to totalize CPU usage to 100 between the processes.

So you do not have to worry about anything.

 

System Idle Process CPU Allocation?

Why when I look in Task Manager does the "System Idle Process" consistently consume the majority of the CPU allocation? Why are the many other running processes not given more CPU cycles?