sudo dmesg

<>

[ 0.000000] APIC: Switch to symmetric I/O mode setup
[ 0.000000] DMAR: Host address width 39
[ 0.000000] DMAR: DRHD base: 0x000000fed90000 flags: 0x0
[ 0.000000] DMAR: dmar0: reg_base_addr fed90000 ver 1:0 cap 1c0000c40660462 ecap 7e1ff0505e
[ 0.000000] DMAR: DRHD base: 0x000000fed91000 flags: 0x1
[ 0.000000] DMAR: dmar1: reg_base_addr fed91000 ver 1:0 cap d2008c20660462 ecap f010da
[ 0.000000] DMAR: RMRR base: 0x0000009ce65000 end: 0x0000009ce84fff
[ 0.000000] DMAR: RMRR base: 0x0000009d800000 end: 0x0000009fffffff
[ 0.000000] DMAR: [Firmware Bug]: No firmware reserved region can cover this RMRR [0x000000009d800000-0x000000009fffffff], contact BIOS vendor for fixes
[ 0.000000] DMAR: [Firmware Bug]: Your BIOS is broken; bad RMRR [0x000000009d800000-0x000000009fffffff]
BIOS vendor: Dell Inc.; Ver: A10; Product Version: A10
[ 0.000000] DMAR: ANDD device: 1 name: \_SB.PCI0.SDMA
[ 0.000000] DMAR-IR: IOAPIC id 2 under DRHD base 0xfed91000 IOMMU 1
[ 0.000000] DMAR-IR: HPET id 0 under DRHD base 0xfed91000
[ 0.000000] DMAR-IR: x2apic is disabled because BIOS sets x2apic opt out bit.
[ 0.000000] DMAR-IR: Use 'intremap=no_x2apic_optout' to override the BIOS setting.
[ 0.000000] DMAR-IR: Enabled IRQ remapping in xapic mode
[ 0.000000] x2apic: IRQ remapping doesn't support X2APIC mode
[ 0.000000] ..TIMER: vector=0x30 apic1=0 pin1=2 apic2=-1 pin2=-1

Distro: Ubuntu 20.10
Device: Dell Inspiron 5548

Looks like there is a problem is BIOS firmware that needs to be addressed.

A bug fix update would be nice...