[SOLVED] Kubuntu 20.04.3, wake from suspend and dvd tray opens.

[brianinnes]

Currently I'm trying out Kubuntu 20.04.3, after switching between Mint Cinnamon and Kubuntu a few times.

Now using a clean install of Kubuntu 20.04.3, with stock kernel 5.11.0.34.

However as soon as I wake the system from suspend, the dvd drive tray opens!

How bizarre.

Is this an easy fix? I never found this issue in the initial release of Kubuntu 20.04 lts.

So is this a bug in the latest kernel? Is there such a thing as an LTS kernel in Kubuntu? I'm not planning on changing my hardware specs anytime soon, and if I do it'll not be to the latest and greatest CPUs

I'm not at the computer just now, but I'll post my system specs fully when I'm back home.

[GreyGeek]

Yes, it is a bug in the kernel you've upgraded to.
https://www.reddit.com/r/archlinux/c..._from_suspend/
In Discover or muon purge that kernel so you'll revert to the previous one.

[brianinnes]

Yes, it is a bug in the kernel you've upgraded to.
https://www.reddit.com/r/archlinux/c..._from_suspend/
In Discover or muon purge that kernel so you'll revert to the previous one.

Thank you!
I'm not entirely sure how to do that in Muon / Discovery. Won't Purging the kernel make the system non bootable unless I install another kernel? And which kernel should I install? I know in Mint there was a kernel update tool where you could select which kernel to install / remove.

[claydoh]

Just choose a different kernel in Grub when booting, you will have previous versions available. No need to remove anything at this point.

[brianinnes]

Just choose a different kernel in Grub when booting, you will have previous versions available. No need to remove anything at this point.

Thanks, that seems to have worked:

brian@Giger:~$ uname -r
5.11.0-27-generic

Except my system can no longer go into sleep / suspend.

[claydoh]

If the current upgraded 20.04 kernel 5.11 (HWE) is not working well you can revert to the original 5.4 (the"GA" kernel).


https://wiki.ubuntu.com/Kernel/LTSEn...tStack#Desktop

It can be installed and tested without removing existing kernels. If desired those can be removed as shown.



Sent from my LM-V600 using Tapatalk

[brianinnes]

duplicate post, can't delete for some reason.

[brianinnes]

If the current upgraded 20.04 kernel 5.11 (HWE) is not working well you can revert to the original 5.4 (the"GA" kernel).


https://wiki.ubuntu.com/Kernel/LTSEn...tStack#Desktop

It can be installed and tested without removing existing kernels. If desired those can be removed as shown.



Sent from my LM-V600 using Tapatalk

An interesting guide, thank you.

However trying that, and then selecting he original 5.4 kernel from the grub menu, the system hangs at "loading initial ramdisk".

I certainly never had this amount of trouble with the original Kubuntu 20.04 release! So while Kubuntu 20.04.3 with 5.11.0-34 kernel works, it has the issue with cd tray ejecting on waking from suspend. Earlier 5.4.0-84 kernels seem to hang on loading initial ramdisk. I'm really unsure where to go from here.

[claydoh]

I put my Human Search Bot hat on:


Seems a common item, across distros, and even kernel versions

https://bugs.launchpad.net/ubuntu/+s...v/+bug/1943379
https://bugzilla.kernel.org/show_bug.cgi?id=213759
and
https://forums.linuxmint.com/viewtop...56654&start=40

the last link may have a quick workaround/fix:
https://forums.linuxmint.com/viewtop...66615#p2066615


Me, I'd just unplug the optical drive lol. Or ignore it for a bit. Then unplug it

[brianinnes]

I put my Human Search Bot hat on:


Seems a common item, across distros, and even kernel versions

https://bugs.launchpad.net/ubuntu/+s...v/+bug/1943379
https://bugzilla.kernel.org/show_bug.cgi?id=213759
and
https://forums.linuxmint.com/viewtop...56654&start=40

the last link may have a quick workaround/fix:
https://forums.linuxmint.com/viewtop...66615#p2066615


Me, I'd just unplug the optical drive lol. Or ignore it for a bit. Then unplug it

Yes, it does seem to be an issue with recent kernels on various distros.

Not sure that uplugging the optical drive is a realistic fix though!

[claydoh]

Yes, it does seem to be an issue with recent kernels on various distros.

Not sure that uplugging the optical drive is a realistic fix though!

It of course depends on how often one uses it, or how quickly the annoyance can be fixed.

[brianinnes]

Success!

Following the guide claydoh posted, https://wiki.ubuntu.com/Kernel/LTSEn...tStack#Desktop to change to the generic desktop stack. However the kernel installed with this, 5.4.0-84 had the same issue.

I then looked at what had been installed using Muon (linux-headers-5.4.0-84, linux-headers-5.4.0-84-generic, linux-image-5.4.0-84-generic, linux-modules-5.4.0-84-generic and linux-modules-extra-5.4.0-84 generic, and then manually installed the 5.4.0-81 version :-)

So far, running 5.4.0-81, no issues with suspend! ANd a bit of a learning experience, manually installing kernels.


There's a chance I could be doing a major system upgrade soon, a new cpu, motherboard & memory, so perhaps there won't be issue with suspend causing cd tray to eject on new system?