network manager - Laptop wakes up by itself a few seconds after suspend or lidclose

I am running an Ubuntu 18.04.1 with kernel 4.15.0-29-generic, and my laptop (Macbookpro retina 15inch, mid 2015, MacBookPro11,5) wakes up automatically a few seconds after sleep. When I look at the logs in \var\log\syslogs the wakeup event shows up as: Aug 6 15:51:53 Shire NetworkManager[7444]: [1533595913.5200] manager: sleep: wake requested (sleeping: yes enabled: yes).

I have already looked at all the other questions and answers for this, but my problem still persists as follows:

Following this question and its answers, the output of cat /proc/acpi/wakeup is

Device  S-state   Status   Sysfs node
PEG0      S3    *disabled  pci:0000:00:01.0
GFX0      S3    *disabled  pci:0000:01:00.0
PEG1      S3    *disabled  pci:0000:00:01.1
PEG2      S3    *disabled  pci:0000:00:01.2
EC        S4    *disabled  platform:PNP0C09:00

GMUX      S3    *disabled  pnp:00:03
HDEF      S3    *disabled  pci:0000:00:1b.0
RP03      S3    *disabled  pci:0000:00:1c.2
ARPT      S4    *enabled   pci:0000:04:00.0
RP04      S3    *disabled  pci:0000:00:1c.3
XHC1      S3    *enabled   pci:0000:00:14.0
ADP1      S4    *disabled  platform:ACPI0003:00
LID0      S4    *enabled   platform:PNP0C0D:00

and I have isolated the problem to be the ARPT entry. If I lookup the pci for this entry via lspci I get 04:00.0 Network controller: Broadcom Limited BCM43602 802.11ac Wireless LAN SoC (rev 01), which matches the log info that the wake-up is caused by network.

Here is the weird part: I use sudo sh -c "echo ARPT > /proc/acpi/wakeup" to disable the wakeup functionality of ARPT, and it changes the status to disabled correctly, but when I put the laptop to sleep it still wakes up after just a few seconds! More surprisingly, when it wakes up and I check the /proc/acpi/wakeup I see that the ARPT entry has returned to enabled by itself! Note that this does not happen after a restart, but just immediately after disabling the wakeup entry and suspending. It seems that some other script keeps changing this while the laptop is in sleep.

Other things I tried with NO result:

• Stopped network manager via sudo service netwrok-manager stop, but the laptop still wakes up.


• Disabled power management of wifi by using sudo iwconfig wlan0 power off


• Made sure Wake on WLAN (WoWLAN) is off by following this article



• Made \proc\acpi\wakeup read-only.

Update:

I tried disabling both the ARPT and XHC1 and only leaving LID0 enabled (laptop lid), and the system still wakes up after a few seconds. But this time when it wakes up the settings in /proc/acpi/wakeup is kept as it was and is not automatically reverted.

Update 08/17/2018:

With the new kernel 4.15.0-32 the laptop does not wake anymore when the lid is closed, but it still wakes up by itself when the lid is open and it has gone to sleep. At least now I can put my laptop in my backpack without worrying to run out of battery, and also apparently this is a Kernel problem and I doubt I can hack my way around it without spending significant time.