@waveform The issue might be with the bcm2711-rpi-4-b.dtb... sudo dpkg -i linux-firmware-raspi2_5-0ubuntu0~21.04~ppa1_arm64.deb ; sudo flash-kernel --force 5.11.22-9021-raspi ; sudo reboot
Result: no video. sudo dpkg -i linux-firmware-raspi2_5-0ubuntu1~ppa1_arm64.deb ; sudo flash-kernel --force 5.11.22-9021-raspi ; sudo reboot Result: no video. cd /boot ; sudo cp dtb-5.11.22-9021-raspi /boot/firmware/bcm2711-rpi-4-b.dtb ; sudo reboot Result: Video! sudo flash-kernel ; cd /boot ; sudo cp dtb-5.11.22-9021-raspi /boot/firmware/bcm2711-rpi-4-b.dtb ; sudo reboot Result: Video! So maybe there's an issue with the bcm2711-rpi-4-b.dtb which the newer firmwares are installing causing issues with the newer kernels? Working firmware versions I am seeing that work with the older 5.11 bcm2711-rpi-4-b.dtb: sudo vcgencmd version Aug 31 2021 14:52:47 Copyright (c) 2012 Broadcom version 67615e950e1e28b92dfae6303cf7a8b879a8908f (clean) (release) (start) sudo vcgencmd version Sep 30 2021 19:21:03 Copyright (c) 2012 Broadcom version 51215b4f6e3966401ecd99652a35cf1c25069113 (clean) (release) (start) ** Attachment added: "debug info from working boot with 5.11 bcm2711-rpi-4-b.dtb" https://bugs.launchpad.net/ubuntu/+source/linux-raspi/+bug/1944397/+attachment/5530890/+files/impish-10_05_2021_2152EDT.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
