Zorin 16 Pro reboots and freezes randomly

Hi -
I've been running Zorin OS Pro since 2019. First 15 and now 16. (NUCi5BEH with 32 GB RAM and dual-booting with Ubuntu 20.04)

Over the last year, I've been plagued with random reboots and freezes. The reboots are self explanatory, the freezes result in the NUC lights showing that the PC is operational, but the monitor never comes out of sleep.

I do not have any of the same issues when I'm in Ubuntu.

If this were a Windows PC, I'd be able to troubleshoot it. However, I have had zero issues in my 5+ years of using a *nix distro and consequently don't know where to start to diagose the issue.

Any suggestions?

(the fact that I have to post this is a testament to the rock-solid nature of the OS!)

There are two things that come to mind:
Zorin OS 16 is using a different kernel than Ubuntu 20.04 is.

RAM. - Have you run Memtest to test the RAM?

For kernel, try adding a grub parameter:

sudo nano /etc/default/grub

Change GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" to:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash nvme_core.default_ps_max_latency_us=5500"

Also, you might try disabling power management...

CTRL ALT T to enter terminal.

xset -dpms


Your Tech Support Guru

I have the memtest running right now. Through 3 of 4 passes with zero errors so far.

What does the grub edit suggested do? Asking to learn.

I'll give the power management suggestion a try as well.

Thank you!

It sets the Autonomous Power State Transition to 5500 microseconds, allowing more time for the NVME drive to switch between power save states based on the rules configured in the driver (Or kernel).


All 4 runs of the memtest came back clear
Applied the change to GRUB and problem came back an hour later.

Just applied the disabling the Power Management. Will report back.

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