Comment 23 for bug 1849084

Fixed by bios upgrade.....

-kernel: DMI: HP HP Laptop 15-db0xxx/84AE, BIOS F.02 04/06/2018
+kernel: DMI: HP HP Laptop 15-db0xxx/84AE, BIOS F.20 05/15/2019

also interesting
-kernel: amdgpu 0000:04:00.0: VRAM: 256M 0x000000F400000000 - 0x000000F40FFFFFFF (256M used)
+kernel: amdgpu 0000:04:00.0: VRAM: 1024M 0x000000F400000000 - 0x000000F43FFFFFFF (1024M used)

-kernel: AMD-Vi: [Firmware Bug]: : IOAPIC[4] not in IVRS table
-kernel: AMD-Vi: [Firmware Bug]: : IOAPIC[5] not in IVRS table
-kernel: AMD-Vi: [Firmware Bug]: : No southbridge IOAPIC found
-kernel: AMD-Vi: Disabling interrupt remapping

and other changes
with previous bios kernel 5.4 did not load (black screen at boot).
with current bios it is loaded now :
Linux 5.4.0-050400rc5-generic #201910271430