this is really a continuation from this thread, which I marked as 'correct answer/solved', [my screen resolution was wrecked, and my external VGA/HDMI ports didn't work at all, in the thread below, I found a fix (in the thread below, restoring to 1/13/15 9.970.100.9001 driving) to correct the laptop resolution, and make the VGA/HDMI ports work properly]
but now I now get BSOD VIDEO TDR FAILURE atikmpag.sys , when windows 10 comes back from sleep mode.(with external monitor attached, HP Elitebook 8530p, with samsung synchmaster NC240 attached via VGA port). If I disconnect the external monitor from VGA port before waking, and connect it after waking, it works fine - more usable, but still a bug
so, it's definitely an issue of waking from sleep with an external monitor attached, and again, it began with windows 10 update, 1709 'fall creators'. I created the new question, because it's a separate issue, and having marked the previous one solved, it probably doesn't get notice.
[I did see a number of threads 'BSOD VIDEO TDR FAILURE atikmpag.sys', but none that seemed a general solution to this set of circumstances, and I cant help but think a lot of people got zapped in the same way by the Microsoft Windows 10 1709 'Creator's update ]