[5.10.52-v7l+ #1440] HDMI CEC stops working

[MichaIng]

Is this the right place for my bug report?
This repository contains the Linux kernel used on the Raspberry Pi. If you believe that the issue you are seeing is kernel-related, this is the right place. If not, we have other repositories for the GPU firmware at github.com/raspberrypi/firmware and Raspberry Pi userland applications at github.com/raspberrypi/userland. If you have problems with the Raspbian distribution packages, report them in the github.com/RPi-Distro/repo. If you simply have a question, then the Raspberry Pi forums are the best place to ask it.

Describe the bug
After upgrading the kernel from previous stable 5.10.17 2021-05-27 to latest stable 5.10.52 2021-07-27 (firmware #1440), CEC stops working. When downgrading the kernel back to previous stable version, it works again.

To reproduce

1. Upgrade to the latest kernel/firmware packages on Raspberry Pi OS 32-bit.
2. Try to control Kodi via CEC-capable HDMI device.

Expected behaviour
CEC functionality should not be affected by the kernel upgrade.

Actual behaviour
CEC stops working after the kernel upgrade.

System
Copy and paste the results of the raspinfo command in to this section. Alternatively, copy and paste a pastebin link, or add answers to the following questions:

• Which model of Raspberry Pi? Pi4
• Which OS and version (cat /etc/rpi-issue)? Raspberry Pi OS Buster
• Which firmware version (vcgencmd version)? version 6a796bb0062a6c75191c57cba1c13f9300076d02 (clean) (release) (start)
• Which kernel version (uname -a)? Linux <host> 5.10.52-v7l+ #1440 SMP Tue Jul 27 09:55:21 BST 2021 armv7l GNU/Linux

Logs
If applicable, add the relevant output from dmesg or similar.

Additional context
For reference the original bug report: MichaIng/DietPi#4613

[popcornmix]

See Hexxeh/rpi-firmware#267

hopefully fix will be in apt within a couple of days.

[MichaIng]

Ah great. Next time I'll have a look into the Hexxeh repository as well for existing reports 😅.

[MichaIng]

New firmware packages have been released with the fix, I hence mark this issue as closed 👍.