The list of modules to include in the initrd is not under the kernel's control but ubuntu-core-initramfs. This commit should fix the issue:
https://github.com/snapcore/core- initrd/commit/fa088d26aded1a8c8ce9910ccdb81ba99ed976c4 ** Also affects: ubuntu-core-initramfs Importance: Undecided Status: New ** Changed in: linux-raspi (Ubuntu Hirsute) Status: Confirmed => Invalid ** Changed in: linux-raspi (Ubuntu Groovy) Status: New => Invalid ** Changed in: linux-raspi (Ubuntu Focal) Status: New => Invalid ** Changed in: ubuntu-core-initramfs Status: New => Fix Released -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux-raspi in Ubuntu. https://bugs.launchpad.net/bugs/1914608 Title: no console during boot on UC20 Status in ubuntu-core-initramfs: Fix Released Status in linux-raspi package in Ubuntu: Invalid Status in linux-raspi source package in Focal: Invalid Status in linux-raspi source package in Groovy: Invalid Status in linux-raspi source package in Hirsute: Invalid Bug description: when booting UC20 on a Pi4 the screen backlight is completely off and no signal is produced. inspecting the boot a little closer it seems the necessary modules for bringing up the vc4 framebuffer are not included in the initramfs on ubuntu core. once they get loaded (after boot) the backlight and signal turn on. The initrd should include the modules and load them during boot. this is also required to bring any kind of bootsplash back to UC20 which is a reason all our digital signage customers currently hold back on going forward to UC20. the modules required are: ogra@ubuntu:~$ lsmod|grep vc4 vc4 290816 3 drm_kms_helper 225280 3 vc4 snd_soc_core 262144 1 vc4 snd_pcm 143360 5 vc4,snd_bcm2835,snd_soc_core,snd_pcm_dmaengine drm 565248 7 gpu_sched,drm_kms_helper,v3d,vc4 the loading during boot in the journal is shown below: ogra@ubuntu:~$ sudo journalctl -b | grep vc4 Apr 01 17:23:45 ubuntu kernel: vc4-drm gpu: bound fe600000.firmwarekms (ops vc4_fkms_ops [vc4]) Apr 01 17:23:45 ubuntu kernel: fb0: switching to vc4drmfb from simple Apr 01 17:23:45 ubuntu kernel: [drm] Initialized vc4 0.0.0 20140616 for gpu on minor 1 Apr 01 17:23:45 ubuntu kernel: vc4-drm gpu: fb0: vc4drmfb frame buffer device To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-core-initramfs/+bug/1914608/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
