Here is the announcement. I tested the code on Diamond Multimedia Stealth 3D 2000 (S3 ViRGE, 2 MB EDO DRAM, PCI bus) and Stealth 3D 4000 (S3 ViRGE / GX2, 4 MB SGRAM, AGP bus) with Xubuntu 16.04.5 (X Server 1.19.6). Standby resume does not work. If anyone has the hardware register documentation, feel free to e-mail me as long as you do not violate your NDA.
I was able to find hardware register documentation openly online here, although i am not sure if it is complete as you would want: http://www.vgamuseum.info/index.php/component/k2/item/download/540_32bce5e3d2a9fa662e9a33f66f32ae72
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