This task has now been running for a month now, when will it stop.
Just upgraded to MacOS 10.15.2 in hope that it would stop running. 😕
It prevents my iMac to go to sleep automatic.
iMac with Retina 5K display, macOS 10.15
iMac (Retina 5K, 27 pouces, 2019) 10.15.4 - fusion drive (apple built-in)
I have reproduce it on a completely clean install. I added a volume and did install Catalina on it and boot from it.
I did not install anything, just created an account, and an issue is there.
So this is definitively a Catalina issue (I never see on Mojave).
It is related to fusion drive, this does not happen on my MBP that has a SSD, a task will appear after some time or after the 1st sleep/wake sequence.
This task is started by apfsd that starts a user agent that starts com.apple.apfsd/wbc_drain that will never stop and prevent the sleep.
I'm wondering if Apple take care of this as you can find many people having the issue.
I find a workaround, not very clean but this is the only way out, and it will not persist across boot.
The workaround consist in killing this background task by killing the UserEventAgent that supports it.
It turns that it need to be killed several times as it restart
in zsh you can copy past this. This will hide the issue until reboot or may be after sometimes the OS will restart this endless task.
until [ -z $(ps -ef | grep UserEventAgent | grep System | awk '{print $2}') ]
do
ps -ef | grep UserEventAgent | grep System | awk '{print $2}' | xargs sudo kill -9
done
I have an Intel SSD: INTEL SSDSC2BW180A4
I was not able to disable trim... I disabled SIP, then "sudo trimforce disable", then reboot but after reboot trim remains enabled as per the system report.
I have a iMac 5K late 2014 born with fusion drive.
Ouch, it's really bad then....
I tested with safe mode and same problem, wbc_drain is still there.
By the way, back to normal mode the task wbc_drain task is reported every 15 minutes exactly in psmet -g log.
I re-installed Catalina from the Recovery Mode but no luck. The wbc_drain remains in background and prevents the System to suspend :(.
Two options now:
1. Apple provides a fix
2. Back to Mojave
Nice, it did kill the drain process but made a new: IODisplayWrangler which prevent my mac to sleep. 😩
Reboot does not get the ...drain process back.
My 'beloved' "com.Apple.apfsd.wbc_drain" is back again after another reboot.
Let's hope that Apple will fix it soon, otherwise 😩🤯👹
I have the same problem: my imac 5k 2017 with catalina does not go to sleep by itself ... Has anyone managed to solve?
I don't think so. 😩
Just hoping that it is fixed in the 10.15.3 update, but I would not be surprised if it isn't. Apple don't care much about bugs as they has been.
But a restart brings it back.
It would be enough to create
a script that starts when you
log in
I can't do it but if someone
could do it by entering this
command, we would have solved
the problem ...
10.15.3 has been released, I checked in the system preference menu.
Did you try it? Is the bug till present in 10.15.3?
I am back on Mojave and don't want to update to Catalina till it's fixed.
The bug is still there. 😈😩
I tried to generate a plist but the sleep preventing process starts long after boot, so I am not sure what the right approach is.
I would want to automate it, though...
com.apple.apfsd.wbc_drain
