I recently bought a SIIG CE-KV0411-S1 (2-port DisplayPort KVM) to share an Asus VK278Q between my gaming PC and a MacBook. The Mac never gives me any trouble, but if the PC goes to sleep while it is selected on the KVM, when it wakes up, it looks like the attached picture. (Please ignore the moire pattern imposed over the pattern I'm referring to ,due to taking a picture of a screen.)
If I put the PC to sleep myself, then switch away from the KVM, it seems to be fine when I come back. If I try switching the monitor "off and on again" when this happens, the monitor won't come back. I've seen the pattern survive a normal reboot (but resolve when shutdown and restarted).
The video card in the PC is an "EVGA SuperClocked 02G-P4-2765-KR G-SYNC Support GeForce GTX 760," to quote the NewEgg order history. Is this effect the result of G-SYNC? Is there a setting I can configure to prevent this? I've tried running the PC at 50 Hz, but that didn't fix it! I'm out of things to try.
I'm specifically running DisplayPort from the Mac because I think VGA, DVI, and HDMI all look even fuzzier than DisplayPort on my monitor, which still isn't great, and which is the source of a lot of crazy talk on the internet, like, Apple purposely does that to sell more high-end monitors.
Barring a configuration fix, is this KVM just problematic? Is there another on the market that would be better?
I'm a little afraid to damage the LCD while fooling around with this. Is there danger of damage in having this happen?