XOrg in Debian10/Buster not usable with AMD Duron / Matrox G400

[Felix Miata]

Markus Hiereth composed on 2019-07-16 11:05 (UTC+0200):
...
I have Buster working with P4 and G400 mostly OK here. xrandr --dpi 120 cannot get
size of gamma for output default.

# dpkg-query -l | grep mga
ii  xserver-xorg-video-mga 1:2.0.0-1 i386 X.Org X server -- MGA display driver
# inxi -GxxSa
System:    Host: gx27c Kernel: 4.19.0-5-686 i686 bits: 32 compiler: gcc v: 8.3.0
           parameters: root=/dev/sda20 ipv6.disable_ipv6=1 net.ifnames=0 noresume mitigations=auto consoleblank=0 3
           Desktop: Trinity R14.0.7 tk: Qt 3.5.0 wm: Twin dm: startx Distro: Debian GNU/Linux 10 (buster)
Graphics:  Device-1: Matrox Systems MGA G400/G450 driver: N/A bus ID: 01:00.0 chip ID: 102b:0525
           Display: tty server: X.Org 1.20.4 driver: mga unloaded: modesetting alternate: fbdev,vesa
           resolution: 1680x1050~60Hz
           OpenGL: renderer: llvmpipe (LLVM 7.0 128 bits) v: 3.3 Mesa 18.3.6 compat-v: 3.1 direct render: Yes

Which BIOS version does your G400 have? I upgraded mine to 2.1 about 10 years ago.
I have the software that did the upgrade if you need it. It doesn't seem available
from matrox.com any more.
http://fm.no-ip.com/Tmp/Hardware/Gfxcard/mgabios.zip
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