I used to use an old Philips monitor with my desktop in both Windows 8.1 and 10, on a HDMI connection, I've been using the monitor with no timeouts at all due to it potentially causing the desktop to reset to 1024x768 in secret, wrecking all windows' sizes and positions. It's like Windows suddenly decides that the monitor has been disconnected or is no longer Plug N Play. I've noticed that some cable connector and monitor combinations will do wacky things once the monitor is off for a significant period of time. When this kind of problem happens, does it go away once you unplug and plug in the monitor's video cable? The problem keeps coming back to my VGA connection to the integrated graphics accelerator on the motherboard (no separate dedicated graphics card). I could extend the sleep time but that seems a backward step, I don't mind it going to sleep to save energy. Perhaps there is some kind of compatibility issue between the hardware, driver and the Win 10 update or maybe some Win 10 setting was changed. It doesn't matter whether I set the problem VGA monitor as primary or secondary. I have tried uninstalling the graphics driver, using a 3rd party product (DDU) to properly clean out following the uninstallation and reinstalling an up to date driver, but it didn't help. The problem only manifests after the pc has gone to sleep then wakes up.
The monitors doze off after 5 mins, the pc after 10. The VGA never wakes up after the computer goes to sleep but works fine when the pc starts or reboots. I switched from 8 to 10 in May but it worked fine till the upgrade. I have two monitors, one connected via a VGA cable and the second via an HDMI. I have had a similar problem since the major Windows 10 upgrade around 3rd October 2016. I have the same problem when using the Intel integrated graphics, without the discrete GPU. Instead, I have to hard shut down the system. I believe that the system is actually 'awake', but since there is no display output, I cannot really tell and I cannot make any forward progress. When I attempt to wake the PC up, the power light goes solid (and the CPU fan turns on), but the display does not show anything because there is no signal being received by the monitor.
When the PC goes to sleep, the power light on the case starts to blink slowly, and the monitor shauts off.
Two mice, both HID-compliant mouse, and CAN wake up the system from sleep mode Two keyboards, both HID Keyboard Device, and CAN wake up the system from sleep mode System: Desktop Skylake Core i7 6700K on an Asus Z170-A, with an Nvidia GTX 680, running windows 10, 64-bit with latest updates, BIOS, and drivers
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