Arch Linux

samoloth

Member

Registered: 2019-09-11

Posts: 18

DMAR Firmware Bug and DRM AUX Error

Hi,

I've already installed Arch after few months of using Ubuntu and I got two errors:

DMAR: [Firmware Bug]: No firmware reserved region can cover this RMRR, contact BIOS vendor for fixes.
[drm] *ERROR* AUX A/port E: did not complete or timeout within 10ms

I'm curious what's going on. My UEFI is up to date (ASRock Z170 Gaming K4). Any ideas?

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I apologise for any possible language mistakes and greetings from Poland!

Lone_Wolf

Member

From: Netherlands, Europe

Registered: 2005-10-04

Posts: 11,911

Re: DMAR Firmware Bug and DRM AUX Error

For clarity :
https://www.asrock.com/mb/Intel/Fatal1t … 20K4/#BIOS lists 7.30 from 2018/3/12 as latest version.
You are using that version ?

DMAR has to do with IOMMU , on intel processors known as Intel VT-x Intel VT-d .
Is microcode[1]  loading enabled ?

Direct Rendering Manager (DRM) issues can have many causes but are usually related to videocards / drivers.

While this may be bette to deal with in 2 separate threads, both will need same basic info :

Full output of dmesg and/or journalctl -b , also

$ lspci -knn
$ lscpu

[1] https://wiki.archlinux.org/index.php/Microcode

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Disliking systemd intensely, but not satisfied with alternatives so focusing on taming systemd.

(A works at time B)  && (time C > time B ) ≠  (A works at time C)