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

[Felix Miata]

Markus Hiereth composed on 2019-08-10 22:27 (UTC+0200):

> [  3974.700] (II) MGA(0): VESA VBE DDC supported
> [  3974.700] (II) MGA(0): VESA VBE DDC Level none
> [  3974.700] (II) MGA(0): VESA VBE DDC transfer in appr. 0 sec.
> [  3974.844] (II) MGA(0): VESA VBE DDC read failed

I spotted another unexpected difference. Mine:
[  1679.533] (II) MGA(0): VESA VBE DDC supported
[  1679.533] (II) MGA(0): VESA VBE DDC Level 2
[  1679.533] (II) MGA(0): VESA VBE DDC transfer in appr. 1 sec.
[  1681.106] (II) MGA(0): VESA VBE DDC read successfully

This suggests to me your problem's root could be in your display's EDID. Have you
tried with other displays?
-- 
Evolution as taught in public schools is religion, not science.

 Team OS/2 ** Reg. Linux User #211409 ** a11y rocks!

Felix Miata  ***  http://fm.no-ip.com/