We have a PC with motherboard MSI A68HM-E33 V2.
It has an HDMI and a VGA output connectors on board.
On Linux, the VGA port doesn't work.
randr lists an HDMI output (works OK) and a DVI output, marked as disconnected.
We tried forcing video output on this DVI interface, but we get no video on the VGA port.
We tried different monitors and cables, with no success.
We installed windows 7 on another disc, and after installing the official amd windows driver, it works fine, dual head with video in both connectors; so, it's not a hardware issue (i.e. a burned vga port)
We are running Debian Stretch with 4.19.0-0.bpo.6-amd64 kernel.
The HDMI output works fine.

Thanks in advance, and sorry for any mistakes, this is my first bug report and english is not my first language.

This is a kernel amdgpu driver issue, not an xserver-xorg-video-amdgpu
one.

I can say, I understood a limitation of amdgpu kernel driver
has been not supporting VGA/analogue outputs in some (or all?)
cases.  I understood this is part of the reason it is not the
default driver over radeon for some cards.


However, given many other other experiences and bugreports
with amdgpu modesetting problems, and looking at this bug,
I would recommend trying newer kernel in buster:-

enable backports  https://backports.debian.org/Instructions/

apt-get -t buster-backports install linux-image-amd64 linux-headers-amd64


This should get you a 5.10 series kernel which could well behave
better for you (let us know!).

Julian and bug 942318,

buster-backports now provides kernel 5.10.0-0.bpo.7 via the
buster-backports linux-image-amd64 linux-headers-amd64 packages.

Please confirm if this solves the issue for you, and close the bug.