The kernel at https://kernel.ubuntu.com/~juergh/hirsute-raspi/ does let video work.
It even works with the current firmware! debug info attached using current firmware.. ** Attachment added: "impish-debug-10_05_2021_2123EDT.txt" https://bugs.launchpad.net/ubuntu/+source/linux-raspi/+bug/1944397/+attachment/5530888/+files/impish-debug-10_05_2021_2123EDT.txt -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1944397 Title: HDMI does not display anything with Impish RPi desktop image To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-firmware-raspi2/+bug/1944397/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs