Bug#942318: xserver-xorg-video-amdgpu: VGA output is not detected in Radeon R7 (Carrizo) only the HDMI works. Motherboard MSI A68HM-E33 v2

["Simon Iremonger (debian)" <debian@iremonger.me.uk>]

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!).

--Simon


p.s.  the backports kernel is lagging behind a little,
hopefully 5.10.0-0.bpo.6 and 5.10.0-0.bpo.7 will come
out soon.