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January 8th, 2021 00:00
DMAR: [Firmware Bug]: No firmware reserved region can cover this RMRR [0x000000009d800000-0x000000009fffffff]
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...
DELL-Cares
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August 21st, 2022 19:00
Hello, I see you are looking for technical assistance. If you need our help, you can start a private message with us and we will be happy to assist you.
pm29
1 Message
0
October 12th, 2022 03:00
dell vostro 14 5468
Ubuntu 22.04.1 LTS
bios 1.20.0
DMAR: [Firmware Bug]: No firmware reserved region can cover this RMRR [0x
000000008d000000-0x000000008f7fffff], contact BIOS vendor for fixes
DMAR: [Firmware Bug]: Your BIOS is broken; bad RMRR [0x000000008d000000-0x
000000008f7fffff]
BIOS vendor: Dell Inc.; Ver: 1.20.0; Product Version:
pit38
1 Message
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February 3rd, 2023 12:00
Pit, from France. Excuse my poor English.
Same problem msg for me !
With Linux Mint 21 (Ubuntu 22), on a Dell Latitude 5470, BIOSVersion 1.5.0
Any help from Dell ?
What does this msg mean and what to do to get rid of it ?
Thanks
Chmoj
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2 Points
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November 13th, 2025 23:24
Y'all I fixed my problem!!
When I scrolled down past this error alert, I saw a warning that my SATA was in RAID mode instead of AHCI. I rebooted (just typed ctrl+c then reboot), opened my BIOS, went into (I believe) system settings? Then SATA settings, switched from RAID to AHCI, saved and exited, and then my laptop booted no problem.
However, my situation may have been different than anyone else's. My laptop's battery drained overnight and reset its BIOS settings. I had to switch from Legacy back to UEFI to even get to this. Therefore, the problem might not have actually been that my BIOS was broken. But, hey, give it a shot, see if it works for you too.
Distro: Fedora 43 KDE
Device: Latitude e7470 (i7cpu, not i5)