Lubuntu doesn’t manage the kernel or Ubuntu base system that accesses your hardware, and we can only file a bug if we can replicate the issue & thus report on what we experience. It’s likely the 5.15 kernel is not ‘playing well’ with your graphics hardware, thus we’d need a system using the same hardware & be using the same kernel modules (aka drivers) to experience the issue.
Lubuntu 21.10 is in it’s last days of support; thus 5.13 kernel is not a safe choice.
Lubuntu 20.04 LTS has two supported kernels, the GA or most stable choice of 5.4 is supported the life of the product, and HWE which recently switched from 5.13 to 5.15 (as the changes in 20.04.4 to 20.04.5 roll out).
Our bug reporting link is https://phab.lubuntu.me/w/bugs/
It tells you how to file a bug, all you need is the package name, where I’d start by looking at what kernel module is involved on your system where you have issues (ie. 5.15); I’d compare that to what you see when using the 5.13 kernel to see if it’s changed; as if it has that maybe something support can solve.
Using the command
sudo lshw -C display to list hardware of class ‘display’ for my own box; I can see that this system uses a
radeon kernel module (ie. it reported
driver=radeon in the output). Was that detail the same for both your 5.13 & 5.15 listings? Depending on what I saw here, I might file the bug report against the kernel or kernel module itself.
To file a bug report against the kernel, you use
To file a report against the kernel module
radeon, I first need the package, so I’m my case I’d likely use
guiverc@d960-ubu2:/de2900/ubuntu_64/slow_boot$ dpkg -l |grep radeon
ii libdrm-radeon1:amd64 2.4.110-1ubuntu1 amd64 Userspace interface to radeon-specific kernel DRM services -- runtime
ii xserver-xorg-video-radeon 1:19.1.0-2build3 amd64 X.Org X server -- AMD/ATI Radeon display driver
I know DRM is digital rights… so I’ll ignore that, and file using
If I wasn’t sure which of those two packages was the correct package, I’d just file using
ubuntu-bug linux and let a bug triager correct it if they felt it was wrong.