No 4K on Logitech Brio after upgrading firmware on Raspberry Pi 4

[jdoscher]

I've got two Raspberry Pi 4's that are running identical configurations:
-Raspberry Pi 4GB
-SanDisk microsd
-High amp USB C power adapter
-USB2 connected to directly to a Prusa MK3S printer
-USB3 Logitech Brio 4K webcam

Before the update I was able to stream 4K footage directly from the Logitech Brios using ffmpeg/mjpeg-streamer as is common with Octoprint. After the update, the printer on both devices works fine. However, the Logitech Brio cameras will only stream at 1920x1080 maximum. From older device testing I'm familiar with this issue, as it normally indicates the host device is limited to USB2. There are no hubs, the Pis are not thermally throttled, and the webcams test fine on Windows computers.

What are some additional troubleshooting steps I can perform? I checked the USB device sticky, and I've searched for solutions and haven't found any. Any help would be appreciated. Thank you in advance.

[jj_0]

What upgrade did you perform?

Maybe it's related to the upgrade of the VL805 USB 3.0 controller. Check out this thread. You could try to revert to the previous VL805 firmware (described somewhere in that thread) and if that fixes the issue post that in the thread.

[jdoscher]

I performed the following updates:

Code: Select all

sudo apt update
sudo apt full-upgrade
sudo reboot
sudo apt install rpi-eeprom rpi-eeprom-images
sudo rpi-eeprom-update -a

I just read the thread you linked to, and this command fixed my issue:

Code: Select all

sudo setpci -s 01:00.0 0xD4.B=0x41

Thank you!

[jj_0]

You're welcome

Please post in the other thread as well, so the people who are working on the VL805 firmware can have a look...