** Changed in: linux-raspi (Ubuntu)
Status: New => Confirmed
** Also affects: linux-raspi (Ubuntu Focal)
Importance: Undecided
Status: New
** Also affects: linux-raspi (Ubuntu Hirsute)
Importance: Undecided
Status: Confirmed
** Also affects: linux-raspi (Ubuntu Groovy)
Importance: Undecided
Status: New
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Packages, which is subscribed to linux-raspi in Ubuntu.
https://bugs.launchpad.net/bugs/1914608
Title:
no console during boot on UC20
Status in linux-raspi package in Ubuntu:
Confirmed
Status in linux-raspi source package in Focal:
New
Status in linux-raspi source package in Groovy:
New
Status in linux-raspi source package in Hirsute:
Confirmed
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
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