Originally Posted by KMASCII
I had the same intermittent flashing and eventual screen black out which only turning the monitor off-and-on seemed to fix... but only for a short while. This problem got to be quite bad. My monitor is a Benq 3200PL using the displayport input for 1440p resolution. I use an nVidia card.
What I ended up doing was turning off "DP Auto Switch" on my Benq monitor. I believe it's a display port auto switch. Not sure if you have a similar setting on your monitor. I had read elsewhere that on a Benq it might be the DDC/DI setting, but in my case it was the DP Auto Switch. The monitor seems to work fine now and uses the Displayport regardless of not switching/cycling.
Anyway, in my case it must have been the auto switch feature (monitor cycling through inputs to find a signal) that was messing up.
In my case a similar blink-out effect happens with a screen using a DP cable connection, on a 2017 MBP (MacBook Pro) and in a specific case, with a CalDigit Docking unit TS3, using a DP->DP cable supplied by Dell with a Dell P2715Q display (others have had similar issues) reported to Amazon. Doesn't happen with the same cable using an adapter or a straight cable (USB-C->DP).
My machine does use a internal Radeon Pro 555 graphics card w/ 2048MB VRAM. Different cable tried, that wan't the issue. Looking at hardware issues because software was NOT a cause that I could prove. A friend brought over an older machine to plug in and it did not happen there.
The manufacturer was contacted and confirmed the issue. They were pro-active and sent me a tested unit they claimed to have solved. Alas, not so. I"m looking into a hardware issue on their product. I have a work around that points to hardware. I can get almost 100% OK (haven't tested long enough yet for confidence), plugging in the DP cable first, before attaching ANY other devices to the dock. This is not so great due to having to do this at every startup (boot) of the machine. Manufacturer lost patience with me and gave up troubleshooting after this. They want to refund only at this point, not fix (what I think is) their problem.
Anybody know of such a thing as a DP (port) test monitor with glitch counter to tally up sync failures on a DP port? Or software to do the job??
Was going to return the unit to Amazon and still may do so. Wonder if anybody here has experienced similar?