Comment 6 for bug 1889137

I'll add my data point.

➜ ~ uname -a
Linux Precision-3540 5.4.0-42-generic #46~18.04.1-Ubuntu SMP Fri Jul 10 07:21:24 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux

➜ ~ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 18.04.5 LTS
Release: 18.04
Codename: bionic

➜ ~ inxi -Gxxxz
Graphics: Device-1: Intel vendor: Dell driver: i915 v: kernel bus ID: 00:02.0 chip ID: 8086:3ea0
           Device-2: Advanced Micro Devices [AMD/ATI] Lexa XT [Radeon PRO WX 3100] vendor: Dell driver: amdgpu v: kernel
           bus ID: 3b:00.0 chip ID: 1002:6985
           Display: x11 server: X.Org 1.20.8 compositor: gnome-shell v: 3.28.4 driver: amdgpu,ati,intel
           unloaded: fbdev,modesetting,vesa resolution: 1920x1080~60Hz s-dpi: 96
           OpenGL: renderer: Mesa DRI Intel UHD Graphics 620 (WHL GT2) v: 4.6 Mesa 20.0.8 compat-v: 3.0 direct render: Yes

➜ ~ DRI_PRIME=1 inxi -Gxxxz
Graphics: Device-1: Intel vendor: Dell driver: i915 v: kernel bus ID: 00:02.0 chip ID: 8086:3ea0
           Device-2: Advanced Micro Devices [AMD/ATI] Lexa XT [Radeon PRO WX 3100] vendor: Dell driver: amdgpu v: kernel
           bus ID: 3b:00.0 chip ID: 1002:6985
           Display: x11 server: X.Org 1.20.8 compositor: gnome-shell v: 3.28.4 driver: amdgpu,ati,intel
           unloaded: fbdev,modesetting,vesa resolution: 1920x1080~60Hz s-dpi: 96
           OpenGL: renderer: AMD Radeon Pro WX3100 (POLARIS12 DRM 3.35.0 5.4.0-42-generic LLVM 9.0.1) v: 4.5 Mesa 19.2.2
           direct render: Yes

➜ ~ dpkg -l | grep linux-firmware
ii linux-firmware 1.173.19 all Firmware for Linux kernel drivers

➜ ~ sudo apt install --reinstall linux-firmware
[sudo] password for aparsons:
Reading package lists... Done
Building dependency tree
Reading state information... Done
0 upgraded, 0 newly installed, 1 reinstalled, 0 to remove and 0 not upgraded.
Need to get 74.8 MB of archives.
After this operation, 0 B of additional disk space will be used.
Get:1 http://ca.archive.ubuntu.com/ubuntu bionic-updates/main amd64 linux-firmware all 1.173.19 [74.8 MB]
Fetched 74.8 MB in 13s (5,958 kB/s)
(Reading database ... 275697 files and directories currently installed.)
Preparing to unpack .../linux-firmware_1.173.19_all.deb ...
Unpacking linux-firmware (1.173.19) over (1.173.19) ...
Setting up linux-firmware (1.173.19) ...
update-initramfs: Generating /boot/initrd.img-5.4.0-42-generic
W: Possible missing firmware /lib/firmware/amdgpu/renoir_gpu_info.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/renoir_asd.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/renoir_rlc.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/renoir_mec2.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/renoir_mec.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/renoir_me.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/renoir_pfp.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/renoir_ce.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/renoir_sdma.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/renoir_vcn.bin for module amdgpu
W: Possible missing firmware /lib/firmware/i915/tgl_dmc_ver2_04.bin for module i915
W: Possible missing firmware /lib/firmware/i915/skl_guc_33.0.0.bin for module i915
W: Possible missing firmware /lib/firmware/i915/bxt_guc_33.0.0.bin for module i915
W: Possible missing firmware /lib/firmware/i915/kbl_guc_33.0.0.bin for module i915
W: Possible missing firmware /lib/firmware/i915/glk_guc_33.0.0.bin for module i915
W: Possible missing firmware /lib/firmware/i915/kbl_guc_33.0.0.bin for module i915
W: Possible missing firmware /lib/firmware/i915/icl_guc_33.0.0.bin for module i915
update-initramfs: Generating /boot/initrd.img-5.3.0-53-generic
W: Possible missing firmware /lib/firmware/amdgpu/vega20_ta.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/navi10_mes.bin for module amdgpu
update-initramfs: Generating /boot/initrd.img-4.15.0-1093-oem