Same problem at Ubuntu 20.04 LTS with Radeon RX550.
Processing triggers for initramfs-tools (0.136ubuntu4) ...
update-initramfs: Generating /boot/initrd.img-5.4.0-21-generic
W: Possible missing firmware /lib/firmware/amdgpu/navi12_gpu_info.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/arcturus_gpu_info.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/arcturus_asd.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/arcturus_sos.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/navi12_asd.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/navi12_sos.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/vega20_ta.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/arcturus_rlc.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/arcturus_mec2.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/arcturus_mec.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/navi12_rlc.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/navi12_mec2.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/navi12_mec.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/navi12_me.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/navi12_pfp.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/navi12_ce.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/arcturus_sdma.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/navi12_sdma1.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/navi12_sdma.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/navi10_mes.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/navi12_vcn.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/arcturus_vcn.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/navi12_smc.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/arcturus_smc.bin for module amdgpu
I: The initramfs will attempt to resume from /dev/nvme0n1p2
I: (UUID=baebf59d-af03-4914-806e-c2672a0210d8)
I: Set the RESUME variable to override this.
Processing triggers for sgml-base (1.29.1) ...
Refreshing boot menu
INFO Updating GRUB menu
Same problem at Ubuntu 20.04 LTS with Radeon RX550.
Processing triggers for initramfs-tools (0.136ubuntu4) ... img-5.4. 0-21-generic amdgpu/ navi12_ gpu_info. bin for module amdgpu amdgpu/ arcturus_ gpu_info. bin for module amdgpu amdgpu/ arcturus_ asd.bin for module amdgpu amdgpu/ arcturus_ sos.bin for module amdgpu amdgpu/ navi12_ asd.bin for module amdgpu amdgpu/ navi12_ sos.bin for module amdgpu amdgpu/ vega20_ ta.bin for module amdgpu amdgpu/ arcturus_ rlc.bin for module amdgpu amdgpu/ arcturus_ mec2.bin for module amdgpu amdgpu/ arcturus_ mec.bin for module amdgpu amdgpu/ navi12_ rlc.bin for module amdgpu amdgpu/ navi12_ mec2.bin for module amdgpu amdgpu/ navi12_ mec.bin for module amdgpu amdgpu/ navi12_ me.bin for module amdgpu amdgpu/ navi12_ pfp.bin for module amdgpu amdgpu/ navi12_ ce.bin for module amdgpu amdgpu/ arcturus_ sdma.bin for module amdgpu amdgpu/ navi12_ sdma1.bin for module amdgpu amdgpu/ navi12_ sdma.bin for module amdgpu amdgpu/ navi10_ mes.bin for module amdgpu amdgpu/ navi12_ vcn.bin for module amdgpu amdgpu/ arcturus_ vcn.bin for module amdgpu amdgpu/ navi12_ smc.bin for module amdgpu amdgpu/ arcturus_ smc.bin for module amdgpu af03-4914- 806e-c2672a0210 d8)
update-initramfs: Generating /boot/initrd.
W: Possible missing firmware /lib/firmware/
W: Possible missing firmware /lib/firmware/
W: Possible missing firmware /lib/firmware/
W: Possible missing firmware /lib/firmware/
W: Possible missing firmware /lib/firmware/
W: Possible missing firmware /lib/firmware/
W: Possible missing firmware /lib/firmware/
W: Possible missing firmware /lib/firmware/
W: Possible missing firmware /lib/firmware/
W: Possible missing firmware /lib/firmware/
W: Possible missing firmware /lib/firmware/
W: Possible missing firmware /lib/firmware/
W: Possible missing firmware /lib/firmware/
W: Possible missing firmware /lib/firmware/
W: Possible missing firmware /lib/firmware/
W: Possible missing firmware /lib/firmware/
W: Possible missing firmware /lib/firmware/
W: Possible missing firmware /lib/firmware/
W: Possible missing firmware /lib/firmware/
W: Possible missing firmware /lib/firmware/
W: Possible missing firmware /lib/firmware/
W: Possible missing firmware /lib/firmware/
W: Possible missing firmware /lib/firmware/
W: Possible missing firmware /lib/firmware/
I: The initramfs will attempt to resume from /dev/nvme0n1p2
I: (UUID=baebf59d-
I: Set the RESUME variable to override this.
Processing triggers for sgml-base (1.29.1) ...
Refreshing boot menu
INFO Updating GRUB menu
Other info:
martin@slazer:~$ lspci -k | grep -EA3 'VGA|3D|Display' drm_kms_ helper, amdgpu, ttm /BOOT/ubuntu_ 9dd6hp@ /vmlinuz- 5.4.0-21- generic root=ZFS= rpool/ROOT/ ubuntu_ 9dd6hp ro quiet splash vt.handoff=1 d/alsa- base.conf d/iwlwifi. conf d/blacklist- rare-network. conf d/blacklist- ath_pci. conf d/blacklist. conf d/blacklist- modem.conf d/amd64- microcode- blacklist. conf d/blacklist- oss.conf d/blacklist- firewire. conf d/blacklist- framebuffer. conf d/intel- microcode- blacklist. conf
0a:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Lexa PRO [Radeon 540/540X/550/550X / RX 540X/550/550X] (rev c7)
Subsystem: Sapphire Technology Limited Lexa PRO [Radeon RX 550]
Kernel driver in use: amdgpu
Kernel modules: amdgpu
martin@slazer:~$ lsmod | grep "kms\|drm"
drm_kms_helper 184320 1 amdgpu
syscopyarea 16384 1 drm_kms_helper
sysfillrect 16384 1 drm_kms_helper
sysimgblt 16384 1 drm_kms_helper
fb_sys_fops 16384 1 drm_kms_helper
drm 491520 12 gpu_sched,
martin@slazer:~$ find /dev -group video
/dev/fb0
/dev/dri/card0
martin@slazer:~$ cat /proc/cmdline
BOOT_IMAGE=
martin@slazer:~$ find /etc/modprobe.d/
/etc/modprobe.d/
/etc/modprobe.
/etc/modprobe.
/etc/modprobe.
/etc/modprobe.
/etc/modprobe.
/etc/modprobe.
/etc/modprobe.
/etc/modprobe.
/etc/modprobe.
/etc/modprobe.
/etc/modprobe.