rasput1n
Posts: 31
Joined: Sun Sep 01, 2019 3:14 am

Re: Moving Linux Kernel to 5.15

Mon Mar 14, 2022 10:35 pm

Come to think of it, the root partition wasn't read only. It must be a different issue.

PhilE
Raspberry Pi Engineer & Forum Moderator
Raspberry Pi Engineer & Forum Moderator
Posts: 5817
Joined: Mon Sep 29, 2014 1:07 pm
Location: Cambridge

Re: Moving Linux Kernel to 5.15

Tue Mar 15, 2022 10:10 am

You might not have intentionally made it read-only, but the kernel can do that under certain circumstances.

down1
Posts: 10
Joined: Tue Nov 09, 2021 2:18 pm

Re: Moving Linux Kernel to 5.15

Thu Mar 17, 2022 10:46 am

Any idea when it will become mainlined into stable?

dom
Raspberry Pi Engineer & Forum Moderator
Raspberry Pi Engineer & Forum Moderator
Posts: 7193
Joined: Wed Aug 17, 2011 7:41 pm
Location: Cambridge

Re: Moving Linux Kernel to 5.15

Thu Mar 17, 2022 2:36 pm

down1 wrote:
Thu Mar 17, 2022 10:46 am
Any idea when it will become mainlined into stable?
The next bullseye sdcard update (and corresponding apt update) will be 5.15.
It depends on results of testing when that will happen.
Possibly a few weeks, but could be longer if new issues are discovered.

putter
Posts: 6
Joined: Tue Jan 11, 2022 10:46 pm

Re: Moving Linux Kernel to 5.15

Wed Mar 30, 2022 5:05 pm

Today I casually did apt upgrade, and got 5.15...

I see that the zfs-dkms package hasn't been updated for this kernel yet:

Code: Select all

Building initial module for 5.15.30-v8+
configure: error: 
	*** None of the expected "capability" interfaces were detected.
	*** This may be because your kernel version is newer than what is
	*** supported, or you are using a patched custom kernel with
	*** incompatible modifications.
	***
	*** ZFS Version: zfs-2.0.3-9
	*** Compatible Kernels: 3.10 - 5.10
	
Error! Bad return status for module build on kernel: 5.15.30-v8+ (aarch64)
Any idea when the ZFS package will get updated?

thanks

chincheta0815
Posts: 5
Joined: Tue Nov 03, 2020 6:21 am

Re: Moving Linux Kernel to 5.15

Thu Mar 31, 2022 8:13 am

putter wrote:
Wed Mar 30, 2022 5:05 pm

Any idea when the ZFS package will get updated?

thanks
As a possible workaround/update: zfs-dkms from bullseye-backports seems to work.
Probably it makes sense to update archive.raspberrypi.org to use that packages, so there won't be any hasseling with two repos...

santiagobiali
Posts: 4
Joined: Wed Mar 30, 2022 8:27 pm

Re: Moving Linux Kernel to 5.15

Thu Mar 31, 2022 1:14 pm

Upgraded to 5.15 using apt upgrade, but as zfs is not currently supported, did a rollback using:

Code: Select all

rpi-update c31423c78b731922064fb85b011d6a5508224ed1
uname -r shows: 5.10.103-v8+

But when I try to install zfs-dkms using

Code: Select all

apt install zfs-dkms
I get:

Code: Select all

Loading new zfs-2.0.3 DKMS files...
It is likely that 5.10.103-v8+ belongs to a chroot's host
Building for 5.10.0-13-arm64, 5.10.103+, 5.10.103-v7+, 5.10.103-v7l+, 5.10.103-v8+, 5.10.95+, 5.10.95-v7+, 5.10.95-v7l+, 5.10.95-v8+, 5.15.30-v8+, 5.15.32+, 5.15.32-v7+, 5.15.32-v7l+ and 5.15.32-v8+
Module build for kernel 5.10.0-13-arm64 was skipped since the
kernel headers for this kernel does not seem to be installed.
Module build for kernel 5.10.103+ was skipped since the
kernel headers for this kernel does not seem to be installed.
Module build for kernel 5.10.103-v7+ was skipped since the
kernel headers for this kernel does not seem to be installed.
Module build for kernel 5.10.103-v7l+ was skipped since the
kernel headers for this kernel does not seem to be installed.
Module build for kernel 5.10.103-v8+ was skipped since the
kernel headers for this kernel does not seem to be installed.
Module build for kernel 5.10.95+ was skipped since the
kernel headers for this kernel does not seem to be installed.
Module build for kernel 5.10.95-v7+ was skipped since the
kernel headers for this kernel does not seem to be installed.
Module build for kernel 5.10.95-v7l+ was skipped since the
kernel headers for this kernel does not seem to be installed.
Module build for kernel 5.10.95-v8+ was skipped since the
kernel headers for this kernel does not seem to be installed.
Building initial module for 5.15.30-v8+
configure: error:
        *** None of the expected "capability" interfaces were detected.
        *** This may be because your kernel version is newer than what is
        *** supported, or you are using a patched custom kernel with
        *** incompatible modifications.
        ***
        *** ZFS Version: zfs-2.0.3-9
        *** Compatible Kernels: 3.10 - 5.10

Error! Bad return status for module build on kernel: 5.15.30-v8+ (aarch64)

Tried to

Code: Select all

apt reinstall raspberrypi-kernel-headers -y
But got no luck. How do I reinstall kernel headers for 5.10.103-v8+? Can't see old versions in apt list:

Code: Select all

apt list -a raspberrypi-kernel-headers
Listing... Done
raspberrypi-kernel-headers/stable,now 1:1.20220328-1 arm64 [installed]
raspberrypi-kernel-headers/stable 1:1.20220328-1 armhf

User avatar
craigevil
Posts: 541
Joined: Wed Jan 27, 2021 5:22 am
Location: heaven

Re: Moving Linux Kernel to 5.15

Thu Mar 31, 2022 1:31 pm

dom wrote:
Thu Mar 17, 2022 2:36 pm
down1 wrote:
Thu Mar 17, 2022 10:46 am
Any idea when it will become mainlined into stable?
The next bullseye sdcard update (and corresponding apt update) will be 5.15.
It depends on results of testing when that will happen.
Possibly a few weeks, but could be longer if new issues are discovered.
Just wanted to say that the newest 5.15.30 kernel fixed my wifi and Bluetooth issues.

Linux raspberrypi 5.15.30-v8+ #1536 SMP PREEMPT Mon Mar 28 13:53:14 BST 2022 aarch64 GNU/Linux
Raspberry PI 400 Raspberry Pi OS Bookworm Kernel: 6.6.18-v8+ DE: XFCE
Debian - "If you can't apt install something, it isn't useful or doesn't exist"

PhilE
Raspberry Pi Engineer & Forum Moderator
Raspberry Pi Engineer & Forum Moderator
Posts: 5817
Joined: Mon Sep 29, 2014 1:07 pm
Location: Cambridge

Re: Moving Linux Kernel to 5.15

Thu Mar 31, 2022 1:33 pm

Just wanted to say that the newest 5.15.30 kernel fixed my wifi and Bluetooth issues.
...and has caused a new one - the regulatory.db is being ignored or not found, limiting the channel usage (e.g. 1-11 in the 2.4G band).

bls
Posts: 3598
Joined: Mon Oct 22, 2018 11:25 pm
Location: Seattle, WA

Re: Moving Linux Kernel to 5.15

Thu Mar 31, 2022 1:38 pm

PhilE wrote:
Thu Mar 31, 2022 1:33 pm
Just wanted to say that the newest 5.15.30 kernel fixed my wifi and Bluetooth issues.
...and has caused a new one - the regulatory.db is being ignored or not found, limiting the channel usage (e.g. 1-11 in the 2.4G band).
I see this message on both 5.10.103 and 5.15.30:

Code: Select all

Mar 26 09:56:37 pvn kernel: cfg80211: Loading compiled-in X.509 certificates for regulatory database
Mar 26 09:56:37 pvn kernel: cfg80211: loaded regulatory.db is malformed or signature is missing/invalid
Pi tools:
Quickly and easily build customized exactly as-you-want SSDs/SD Cards: https://github.com/gitbls/sdm
Easily run and manage your network's DHCP/DNS servers on a Pi: https://github.com/gitbls/ndm
Easy and secure IPSEC/IKEV2 VPN installer/manager: https://github.com/gitbls/pistrong
Lightweight Virtual VNC Config: https://github.com/gitbls/RPiVNCHowTo

santiagobiali
Posts: 4
Joined: Wed Mar 30, 2022 8:27 pm

Re: Moving Linux Kernel to 5.15

Thu Mar 31, 2022 4:39 pm

santiagobiali wrote:
Thu Mar 31, 2022 1:14 pm
Upgraded to 5.15 using apt upgrade, but as zfs is not currently supported, did a rollback using:

Code: Select all

rpi-update c31423c78b731922064fb85b011d6a5508224ed1
uname -r shows: 5.10.103-v8+

But when I try to install zfs-dkms using

Code: Select all

apt install zfs-dkms
I get:

Code: Select all

Loading new zfs-2.0.3 DKMS files...
It is likely that 5.10.103-v8+ belongs to a chroot's host
Building for 5.10.0-13-arm64, 5.10.103+, 5.10.103-v7+, 5.10.103-v7l+, 5.10.103-v8+, 5.10.95+, 5.10.95-v7+, 5.10.95-v7l+, 5.10.95-v8+, 5.15.30-v8+, 5.15.32+, 5.15.32-v7+, 5.15.32-v7l+ and 5.15.32-v8+
Module build for kernel 5.10.0-13-arm64 was skipped since the
kernel headers for this kernel does not seem to be installed.
Module build for kernel 5.10.103+ was skipped since the
kernel headers for this kernel does not seem to be installed.
Module build for kernel 5.10.103-v7+ was skipped since the
kernel headers for this kernel does not seem to be installed.
Module build for kernel 5.10.103-v7l+ was skipped since the
kernel headers for this kernel does not seem to be installed.
Module build for kernel 5.10.103-v8+ was skipped since the
kernel headers for this kernel does not seem to be installed.
Module build for kernel 5.10.95+ was skipped since the
kernel headers for this kernel does not seem to be installed.
Module build for kernel 5.10.95-v7+ was skipped since the
kernel headers for this kernel does not seem to be installed.
Module build for kernel 5.10.95-v7l+ was skipped since the
kernel headers for this kernel does not seem to be installed.
Module build for kernel 5.10.95-v8+ was skipped since the
kernel headers for this kernel does not seem to be installed.
Building initial module for 5.15.30-v8+
configure: error:
        *** None of the expected "capability" interfaces were detected.
        *** This may be because your kernel version is newer than what is
        *** supported, or you are using a patched custom kernel with
        *** incompatible modifications.
        ***
        *** ZFS Version: zfs-2.0.3-9
        *** Compatible Kernels: 3.10 - 5.10

Error! Bad return status for module build on kernel: 5.15.30-v8+ (aarch64)

Tried to

Code: Select all

apt reinstall raspberrypi-kernel-headers -y
But got no luck. How do I reinstall kernel headers for 5.10.103-v8+? Can't see old versions in apt list:

Code: Select all

apt list -a raspberrypi-kernel-headers
Listing... Done
raspberrypi-kernel-headers/stable,now 1:1.20220328-1 arm64 [installed]
raspberrypi-kernel-headers/stable 1:1.20220328-1 armhf


Update. Fixed:
Downloaded and installed kernel-headers from https://archive.raspberrypi.org/debian/ ... -firmware/

Builded zfs module:
dkms build -m zfs -v 2.0.3

Code: Select all

apt reinstall zfs-dkms zfsutils-linux -y
modprobe -v zfs

PhilE
Raspberry Pi Engineer & Forum Moderator
Raspberry Pi Engineer & Forum Moderator
Posts: 5817
Joined: Mon Sep 29, 2014 1:07 pm
Location: Cambridge

Re: Moving Linux Kernel to 5.15

Thu Mar 31, 2022 5:23 pm

The WLAN regression is now understood - see https://github.com/raspberrypi/Raspberr ... issues/217. A fix will roll out shortly.

putter
Posts: 6
Joined: Tue Jan 11, 2022 10:46 pm

Re: Moving Linux Kernel to 5.15

Fri Apr 01, 2022 6:00 am

chincheta0815 wrote:
Thu Mar 31, 2022 8:13 am
putter wrote:
Wed Mar 30, 2022 5:05 pm

Any idea when the ZFS package will get updated?

thanks
As a possible workaround/update: zfs-dkms from bullseye-backports seems to work.
Probably it makes sense to update archive.raspberrypi.org to use that packages, so there won't be any hasseling with two repos...
Thank you.

kevsestrella
Posts: 2
Joined: Sun Apr 03, 2022 8:00 am

Re: Moving Linux Kernel to 5.15

Sun Apr 03, 2022 8:14 am

Hi,

I did an apt upgrade and got the 5.15 kernel. I'm using a gspca/ov534 camera and found that it's not working on 5.15, v4l2 doesnt find the device.
Last edited by kevsestrella on Sun Apr 03, 2022 2:00 pm, edited 2 times in total.

6by9
Raspberry Pi Engineer & Forum Moderator
Raspberry Pi Engineer & Forum Moderator
Posts: 15914
Joined: Wed Dec 04, 2013 11:27 am
Location: ZZ9 Plural Z Alpha, aka just outside Cambridge.

Re: Moving Linux Kernel to 5.15

Sun Apr 03, 2022 12:55 pm

kevsestrella wrote:
Sun Apr 03, 2022 8:14 am
Hi,

I did an apt upgrade and got the 5.15 kernel. I'm using a gspca/ov534 camera and found that it's not working on 5.15, v4l2 and alsa doesnt find the device.
It looks like USB_GSPCA_OV534 and load of other configs have disappeared between https://github.com/raspberrypi/linux/bl ... #L803-L850 and the 5.15 branch.
That's normally due to a change in the dependencies, and in this case it looks like it is https://github.com/torvalds/linux/commi ... 011d274617 changing the default of the parent USB_GSPCA option from module to disabled.

I've created https://github.com/raspberrypi/linux/issues/4977 to ask my colleague PhilE to deal with it.
Software Engineer at Raspberry Pi Ltd. Views expressed are still personal views.
I'm not interested in doing contracts for bespoke functionality - please don't ask.

kevsestrella
Posts: 2
Joined: Sun Apr 03, 2022 8:00 am

Re: Moving Linux Kernel to 5.15

Sun Apr 03, 2022 2:01 pm

6by9 wrote:
Sun Apr 03, 2022 12:55 pm
kevsestrella wrote:
Sun Apr 03, 2022 8:14 am
Hi,

I did an apt upgrade and got the 5.15 kernel. I'm using a gspca/ov534 camera and found that it's not working on 5.15, v4l2 and alsa doesnt find the device.
It looks like USB_GSPCA_OV534 and load of other configs have disappeared between https://github.com/raspberrypi/linux/bl ... #L803-L850 and the 5.15 branch.
That's normally due to a change in the dependencies, and in this case it looks like it is https://github.com/torvalds/linux/commi ... 011d274617 changing the default of the parent USB_GSPCA option from module to disabled.

I've created https://github.com/raspberrypi/linux/issues/4977 to ask my colleague PhilE to deal with it.
Thank you :D

shcshc
Posts: 1
Joined: Wed Apr 06, 2022 12:44 pm

Re: Moving Linux Kernel to 5.15

Wed Apr 06, 2022 12:49 pm

santiagobiali wrote:
Thu Mar 31, 2022 4:39 pm
santiagobiali wrote:
Thu Mar 31, 2022 1:14 pm
Upgraded to 5.15 using apt upgrade, but as zfs is not currently supported, did a rollback using:

Code: Select all

rpi-update c31423c78b731922064fb85b011d6a5508224ed1
uname -r shows: 5.10.103-v8+

But when I try to install zfs-dkms using

Code: Select all

apt install zfs-dkms
I get:

Code: Select all

Loading new zfs-2.0.3 DKMS files...
It is likely that 5.10.103-v8+ belongs to a chroot's host
Building for 5.10.0-13-arm64, 5.10.103+, 5.10.103-v7+, 5.10.103-v7l+, 5.10.103-v8+, 5.10.95+, 5.10.95-v7+, 5.10.95-v7l+, 5.10.95-v8+, 5.15.30-v8+, 5.15.32+, 5.15.32-v7+, 5.15.32-v7l+ and 5.15.32-v8+
Module build for kernel 5.10.0-13-arm64 was skipped since the
kernel headers for this kernel does not seem to be installed.
Module build for kernel 5.10.103+ was skipped since the
kernel headers for this kernel does not seem to be installed.
Module build for kernel 5.10.103-v7+ was skipped since the
kernel headers for this kernel does not seem to be installed.
Module build for kernel 5.10.103-v7l+ was skipped since the
kernel headers for this kernel does not seem to be installed.
Module build for kernel 5.10.103-v8+ was skipped since the
kernel headers for this kernel does not seem to be installed.
Module build for kernel 5.10.95+ was skipped since the
kernel headers for this kernel does not seem to be installed.
Module build for kernel 5.10.95-v7+ was skipped since the
kernel headers for this kernel does not seem to be installed.
Module build for kernel 5.10.95-v7l+ was skipped since the
kernel headers for this kernel does not seem to be installed.
Module build for kernel 5.10.95-v8+ was skipped since the
kernel headers for this kernel does not seem to be installed.
Building initial module for 5.15.30-v8+
configure: error:
        *** None of the expected "capability" interfaces were detected.
        *** This may be because your kernel version is newer than what is
        *** supported, or you are using a patched custom kernel with
        *** incompatible modifications.
        ***
        *** ZFS Version: zfs-2.0.3-9
        *** Compatible Kernels: 3.10 - 5.10

Error! Bad return status for module build on kernel: 5.15.30-v8+ (aarch64)

Tried to

Code: Select all

apt reinstall raspberrypi-kernel-headers -y
But got no luck. How do I reinstall kernel headers for 5.10.103-v8+? Can't see old versions in apt list:

Code: Select all

apt list -a raspberrypi-kernel-headers
Listing... Done
raspberrypi-kernel-headers/stable,now 1:1.20220328-1 arm64 [installed]
raspberrypi-kernel-headers/stable 1:1.20220328-1 armhf


Update. Fixed:
Downloaded and installed kernel-headers from https://archive.raspberrypi.org/debian/ ... -firmware/

Builded zfs module:
dkms build -m zfs -v 2.0.3

Code: Select all

apt reinstall zfs-dkms zfsutils-linux -y
modprobe -v zfs
i have same problem. what can i exactly do? which heders schuld i download?

fduncanh
Posts: 5
Joined: Mon Mar 14, 2022 8:45 pm

Re: Moving Linux Kernel to 5.15 (trying to find source of a regression)

Thu Apr 07, 2022 2:09 am

current 5.15.32-v8+ and -v7l+ introduces a regression from 5.10.x : a *huge* latency in rendering h264 video with hardware decoding and rendering it with OpenGL (Gstreamer videosink glimagsink) on the "Desktop" Raspberry Pi OS image, but not on the "Lite" using kmssink
for video rendering. (also kernel v7l+). This suggests that the issue involves openGL not the actual h264 decoding with video4linux2.


* i verified this by comparing an app I maintain using clean installations of the January 2022 image Raspberry Pi OS (for desktop,. not Lite)
(a) with 5.10 kernel held back from updating (apt-mark hold raspberrypi-kernel) (works great) and (b) fully-upgraded (HUGE latency).

I believe there must somewhere be a repository where all the sequence of "testing" 5.15 kernel releases leading up to the stable release are kept.

I would like to sequentially upgrade through this sequence to see If I can find a point where this regression appeared (or maybe it was always there?)

**Can anyone tell me where to find these older 5.15.x RPi OS testing kernels to install?**

chrender
Posts: 1
Joined: Fri Apr 08, 2022 8:32 am

Re: Moving Linux Kernel to 5.15

Fri Apr 08, 2022 8:47 am

Thanks to @santiagobiali, the following fixed the ZFS issue for me:

Going back to 5.10.92, according to https://github.com/raspberrypi/rpi-firm ... its/master the latest commit before bump to 5.10.94 is b976c54917e240630c05a9b383010f1492bc61b4, so I ran

Code: Select all

rpi-update b976c54917e240630c05a9b383010f1492bc61b4
Installing headers the following way:

Code: Select all

wget https://archive.raspberrypi.org/debian/pool/main/r/raspberrypi-firmware/raspberrypi-kernel-headers_1.20220120-1_arm64.deb
dpkg -i raspberrypi-kernel-headers_1.20220120-1_arm64.deb
After that, executing

Code: Select all

apt install zfs-dkms zfsutils-linux
produced the ZFS modules for 5.10.92.

santiagobiali
Posts: 4
Joined: Wed Mar 30, 2022 8:27 pm

Re: Moving Linux Kernel to 5.15

Wed May 04, 2022 7:50 pm

As @chincheta0815 said, using ZFS from bullseye-backport also works on 5.15. Just updated one of my rasps and tested.
Here's how:

Insert into "/etc/apt/sources.list":

Code: Select all

	deb http://deb.debian.org/debian bullseye-backports main contrib non-free
	deb-src http://deb.debian.org/debian bullseye-backports main contrib non-free
Then

Code: Select all

	apt update
	apt list -a zfs-dkms
Should show some versions:

Code: Select all

	zfs-dkms/bullseye-backports,bullseye-backports,now 2.1.4-1~bpo11+1 all <- This one is v2.1.4, works with kernel 5.15.
	zfs-dkms/bullseye-backports,bullseye-backports 2.0.6-1~bpo11+1 all
Install the packages from the specific version that supports the 5.15 kernel:

Code: Select all

  	#apt install {ZFS-PACKAGE}={VERSION}

	apt install zfs-dkms=2.1.4-1~bpo11+1
	apt install libnvpair3linux=2.1.4-1~bpo11+1 libuutil3linux=2.1.4-1~bpo11+1 libzfs4linux=2.1.4-1~bpo11+1
	apt install zfsutils-linux=2.1.4-1~bpo11+1
	apt install zfs-zed=2.1.4-1~bpo11+1
That's it.

down1
Posts: 10
Joined: Tue Nov 09, 2021 2:18 pm

Re: Moving Linux Kernel to 5.15

Sat Jul 30, 2022 1:24 pm

On the standard bullseye release. A new kernel hasn't been offered since 5.15.32-v7l+ #Thu Mar 31.

Is this suppose to be the case or have I broken apt?

User avatar
rpdom
Posts: 23354
Joined: Sun May 06, 2012 5:17 am
Location: Chelmsford, Essex, UK

Re: Moving Linux Kernel to 5.15

Sat Jul 30, 2022 1:28 pm

down1 wrote:
Sat Jul 30, 2022 1:24 pm
On the standard bullseye release. A new kernel hasn't been offered since 5.15.32-v7l+ #Thu Mar 31.

Is this suppose to be the case or have I broken apt?
5.15.32 is still the current Pi kernel at the moment.
Unreadable squiggle

down1
Posts: 10
Joined: Tue Nov 09, 2021 2:18 pm

Re: Moving Linux Kernel to 5.15

Sat Jul 30, 2022 1:34 pm

rpdom wrote:
Sat Jul 30, 2022 1:28 pm
down1 wrote:
Sat Jul 30, 2022 1:24 pm
On the standard bullseye release. A new kernel hasn't been offered since 5.15.32-v7l+ #Thu Mar 31.

Is this suppose to be the case or have I broken apt?
5.15.32 is still the current Pi kernel at the moment.
Thanks. I thought it was changed monthly, but if this is suppose to be the case great.

dom
Raspberry Pi Engineer & Forum Moderator
Raspberry Pi Engineer & Forum Moderator
Posts: 7193
Joined: Wed Aug 17, 2011 7:41 pm
Location: Cambridge

Re: Moving Linux Kernel to 5.15

Sat Jul 30, 2022 1:37 pm

Apt updates are relatively infrequent, typically driven by major security updates, bug fixes, or new features (usually tied to application updates that rely on them).

There is a new RPiOS sdcard image planned in the next few weeks that will include a kernel update (but exact date is subject to testing results).

More frequent kernel updates are available through rpi-update, but obviously there is higher risk of regression with less widely tested software.

carldani
Posts: 113
Joined: Wed Jan 11, 2012 12:08 am

Re: Moving Linux Kernel to 5.15 (trying to find source of a regression)

Mon Aug 29, 2022 6:56 pm

fduncanh wrote:
Thu Apr 07, 2022 2:09 am
current 5.15.32-v8+ and -v7l+ introduces a regression from 5.10.x : a *huge* latency in rendering h264 video with hardware decoding and rendering it with OpenGL (Gstreamer videosink glimagsink) on the "Desktop" Raspberry Pi OS image, but not on the "Lite" using kmssink
for video rendering. (also kernel v7l+). This suggests that the issue involves openGL not the actual h264 decoding with video4linux2.
Oh. Thanks for the heads-up. I'm currently in the process of switching my video streaming appliance (Pi 4B) from Raspberry Pi OS Buster with kernel 5.10.52-v8+ to Raspberry Pi OS Bullseye with some kernel 5.15.x and I noticed stuttering video and worse latency, but I didn't measure anything yet. With Buster, GStreamer kmssink was unbearably slow and I had to switch to GStreamer glimagesink for decent performance. I hope I can keep using glimagesink when switching to Bullseye.

Did you manage to bisect the regression?

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