SOLVED Possible Kernel problems with ubuntu 18.04 and latest kernel

[LL-user]

Hi DeepThought and NN,
I haven't looked at the difference yet. Just wondering why you are not using the option in Lite Tweaks to install alternative kernels?

[DeepThought]

Hi LL-user
I've had a look at the kernel-installer in Lite-Tweaks but that doesn't seem to do anything. Here's a screenshot of what I get using that tweak.



Not sure if it's a bug, me or it only uses kernels already downloaded and on the pc

[Valtam]

Hi LL-user
I've had a look at the kernel-installer in Lite-Tweaks but that doesn't seem to do anything. Here's a screenshot of what I get using that tweak.



Not sure if it's a bug, me or it only uses kernels already downloaded and on the pc

It was a bug [member=7644]DeepThought[/member] thank you for the report. It is now fixed. Make sure you update sources when it asks you on the Kernel Installer.

[DeepThought]

[member=2]Jerry[/member]  So glad it wasn't me lol. Anyway I'll update sources next time I try it, atm I'm attempting to compile a kernel v.4.15 using the config file fron v4.7.2 which I know works, using make oldconfig, so should be fun lol

[NN]

Hi DeepThought and NN,
I haven't looked at the difference yet. Just wondering why you are not using the option in Lite Tweaks to install alternative kernels?

Hi, LL-user!

For me ukuu is better. Tastes differ, you know.

[DeepThought]

I have managed to find a one-click solution to this problem and had a massive DOH!!! moment after all the kernel installing/testing/compiling I have done over the last few days

Since I was convinced the problem was with the kernel I refined my google searches to "Kernel preventing reboot/shutdown" instead of "Ubuntu 18.04 not rebooting/shutting down" and found the answer.

The problem stems from 2 differing technologies for Power management. APM (Advanced Power Management) and ACPI (Advanced Configuration and Power Interface) with APM being the older and slowly deprecated technology.The main difference that led me to my solution was, APM is centered on the BIOS while ACPI is centered on the operating system.

http://www.differencebetween.net/technol...-and-acpi/

So from info found on the net I looked through my bios configuration for anything mentioning apm or acpi but only found PowerNow (AMD PowerNow! is AMD's dynamic frequency scaling and power saving technology for laptop processors).

https://en.wikipedia.org/wiki/PowerNow!

I disabled PowerNow, saved the bios config and rebooted and that was it, laptop rebooting and shutting down as it should do.

To further confirm this I looked through the config for a few of the kernels that didn't work and found no reference to APM, which I assume means APM support is no longer been built into or built as a module for todays kernels.


So after a clean install of LL 4.0 my laptop is chirping away quite happy to reboot or shutdown properly.

Hope this adventure helps anyone with similar power management problems

[Valtam]

Excellent information here.

Sent from my Mi Max using Tapatalk

[DeepThought]

Thank you [member=2]Jerry[/member]