Viewsonic 22 inch VX2262wm widescreen LCD VGA up to 1680 x 1050 resolution, VIDEO Response as fast as 2ms. Viewsonic LCD VX2262wm (brochure) https://www.viewsonic.com/eu/products/sheet/VX2262wm === It was apparently indeed in a self-test mode. When I fed it, it actually worked well. When I looked at it using my video configuration in KDE on Debian 12, it claims to be a Viewsonic VX2262wm. Van Snyder