⚠️ RPi3b/Zero2 Kernel 6.6 grabber bug: colors are swapped ⚠️

[awawa-dev]

When using a USB grabber color swapping may occur (blue with red, red with green...).

correct one:

captured image:

Symptoms described by our users:
#867
#844
#834
#797

Affected devices:
USB grabbers with Raspberry Pi OS Bookworm, 6.6.x Kernel
RPi3b and probably similar A53 boards, on the other hand RPi4 is not affected

⚠️ Not sure if the RPi team is aware of the problem or is planning to fix it. So please report the issue to them to fix it, or stay on Kernel 6.1 or buy RPi4/5 🤷 ⚠️ Or even better: buy much better than RPi Intel N100 mini PC for similar price 😈

Known solutions:

• downgrade the Kernel to 6.1.x
• use our Debian Bullseye based official HyperHDR SD images (https://github.com/awawa-dev/HyperHDR/wiki/Installation#raspberrypi-os-sd-card-image-installation)
• use older Raspberry Pi OS Bookworm release ex. aarch64: https://downloads.raspberrypi.org/raspios_lite_arm64/images/raspios_lite_arm64-2023-12-11/ or armhf: https://downloads.raspberrypi.org/raspios_lite_armhf/images/raspios_lite_armhf-2023-12-11/ or even older version from https://downloads.raspberrypi.org server (after install do not upgrade the kernel!)

[SodaPop-droid]

New to this sort of thing - How would I go about downgrading the kernel?
Is it a type of code i could copy across into PuTTY?

[awawa-dev]

#867 (comment)

[SodaPop-droid]

I thought this one would be referenced, I'm uncertain how the Hash works.
Do i copy the blue hyperlink across or go into it and source part of the code from somewhere?

[awawa-dev]

There you have the sudo rpi-update command with a hash to execute. As I noted, this has not been tested by me and I am only relying on the general RPi manual so you can read it too before proceeding.

[SodaPop-droid]

Aa I see, thank you for your help

[zigomatichub]

Trying as I'm facing the issue after upgrade the firmware on my raspberry pi zero 2W + update HyperHDR to 20.0.0.
All was done together,then difficult for me to see where is the issue.

I found commits on https://github.com/raspberrypi/rpi-firmware/commits/master/?after=1ec318fceecbb3d518dc889a3ed8369c5e1aac37+34

And put back with 6.1.77
sudo rpi-update 5fc4f643d2e9c5aa972828705a902d184527ae3f

Now in SDR, It's back OK.
But HDR, still color is not aligned.
I think in the HyperHDR 19, it was also the case where I never get that corrected. HDR it's link to kernel as it was also before...
It's may link to my splitter ROFAVEZCO HDMI 2.0 Splitter 4k 60hz 1080p 120hz.
I'm surprise as well that a kernel can give trouble like this and I don't know how awawa-dev found that relation but it's a good one 👍

[LEDExperiments]

Thank you so much for posting a concrete command what to do to fix this bug! I just applied _ sudo rpi-update 5fc4f643d2e9c5aa972828705a902d184527ae3f_ and now I get the right colors 👍

[sysTim1977]

One of the latest funktionable Kernel is 6.1.74

root@yourhost# rpi-update d86b5843d68b9972a5430a6d3da1b271cfc83521