OK, I’ve never run into this one. Basically, if I let the (desktop) PC sleep, when I come back and wake it via the space bar, I hear the PC come on, the power light goes solid and all that, but the monitor doesn’t get a video signal. Weirdly, what will actually turn it on is pressing the PC’s reset button for just an instant, at which point suddenly the monitor shows the lockscreen immediately. The PC has clearly not restarted because it hasn’t had time to, I haven’t seen the “Press Del or F2 for setup” message etc.
Things that have recently changed and not changed:
NOT changed: Nvidia drivers – sleep and wake were working fine after last update of those.
- Updated BIOS to latest one for my ASUS Z170-A motherboard.
- Swapped out a smaller data HDD for a larger one and cloned the old volumes to the newer HDD, creating a large extra NTFS volume with the remaining space. Used GPartEd Live CD for all that.
- Installed latest Windows 10 updates of this week for build 1909.