Cannot shutdown or reboot after Kernel 5.0.0 upgrade

AchmadFathoni

I have tried to increase /proc/sys/kernel/watchdog_thresh to 60 but it still not work. I cannot find the full log because every time this stuck happens I must plug-off the power cable. I use Ubuntu 18.04.4

chris_yokum

I have had the same issue with stock 18.04 kernels, the 19.10 kernel, and the upboard kernel from the ppa: Linux upboard 5.0.0-1-generic #2~upboard5-Ubuntu

In all cases, reboot/shutdown hangs with the same messages you see.

DCleri

Hi @AchmadFathoni and @chris_yokum

Thanks for reporting the issue and the additional details on other kernels having the same.

We will investigate it further and come back to you.

tcb2

see www.reddit.com/r/Atomic_Pi/wiki/ubuntu

'Hang on shutdown or reboot with certain releases. This is a problem related to kernel modules for HSUART DMA support that get loaded. The HSUARTs on the SOC are not normally used on the AtomicPi, however they do appear on the 26pin connector. The HSUARTs can still be used in PIO mode even after disabling DMA support, but will be less CPU efficient. To permanently prevent the modules from loading, edit the file /etc/modprobe.d/blacklist.conf and add lines to the bottom... "

blacklist dw_dmac_core
install dw_dmac /bin/true
install dw_dmac_core /bin/true

janindu

Hi @DCleri,

Any updates on this? I still have this problem with the stock 18.04 kernel and the UP custom 5.0.0 kernel.

Up board hangs on reboot / shutdown.

Thanks

rogertsai(AAEON)

@janindu
Try this, to enter BIOS setup, Chipset > South Bridge > configure the "LPSS DMA #1 support" to PCI Mode

chris_yokum

Hi Roger,

This BIOS setting fixed my ability to reboot the upboard!

Thank you!

rogertsai(AAEON)

Hi all
Please refer to the link below to solve this Hang problem
https://wiki.up-community.org/Ubuntu_18.04#Hang_on_Shutdown_or_Reboot_for_UP_Board_and_UP_Core

nguyenpham

Same problem. But when i try both wiki and BIOS setup, only BIOS setup work. Thank you!

dot_blue

Thanks to @rogertsai(AAEON)

I managed to fix it by entering BIOS setup then:
Chipset > South Bridge > configure the "LPSS DMA #1 support" to PCI Mode
Chipset > South Bridge > configure the "LPSS DMA #2 support" to PCI Mode