nRFConnect SDK 1.9 system off sample fails to put the nRF52840DK into system off

[tellg]

*** Booting Zephyr OS build v2.7.99-ncs1 ***

nrf52840dk_nrf52840 system off demo
Retained data not supported
Busy-wait 2 s
Busy-wait 2 s with UART off
Sleep 2 s
Sleep 2 s with UART off
Entering system off; press BUTTON1 to restart
ERROR: System off failed

[Simon]

You are right, the sample zephyr\samples\boards\nrf\system_off\src\main.c does not work with NCS v1.9.0. I tested it with both the nrf52dk_nrf52832 and nrf52840dk_nrf52840 and I got "ERROR: System off failed" in both cases. It did work with NCS v1.8.0 however. After some investigation I found out it was the commit 749c3939c1a8605 that made it fail, if I use the commit 5952351d82b, right before, it works fine. I'm not exactly sure what in that commit that causes it to fail, but I will do some investigations tomorrow.

Best regards,

Simon

[tellg]

Thank you. Could a fix that was done in the zephyr main repo fix this?, ref https://github.com/zephyrproject-rtos/zephyr/pull/42274

[Simon]

That could be. I tried to merge the changes from https://github.com/zephyrproject-rtos/zephyr/pull/42274 into Zephyr associated with NCS v1.9.0, but I encountered errors. Would you be able to install upstream Zephyr and test that? You could also open a Zephyr issue about this (https://github.com/zephyrproject-rtos/zephyr/issues)? Please link to it in this ticket, if you do so. 

[tellg]

I will try after the weekend.

[tellg]

Same error with upstream @ 98dea7e0bd0a0572cd09b79d21c66592888c5346:

*** Booting Zephyr OS build zephyr-v3.0.0-529-g98dea7e0bd0a ***

nrf52840dk_nrf52840 system off demo
Retained data not supported
Busy-wait 2 s
Busy-wait 2 s with UART off
Sleep 2 s
Sleep 2 s with UART off
Entering system off; press BUTTON1 to restart
ERROR: System off failed

[tellg]

Same on official zephyr 3.0.0 release:

*** Booting Zephyr OS build zephyr-v3.0.0 ***

nrf52840dk_nrf52840 system off demo
Retained data not supported
Busy-wait 2 s
Busy-wait 2 s with UART off
Sleep 2 s
Sleep 2 s with UART off
Entering system off; press BUTTON1 to restart
ERROR: System off failed

[tellg]

Reported to zephyr project as https://github.com/zephyrproject-rtos/zephyr/issues/43285 

[tellg]

And was fixed by https://github.com/zephyrproject-rtos/zephyr/pull/43187