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Should DisplayPort "Lanes (current)" be below "max" possible?

EternalStudent07

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Apr 8, 2022
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I found a setting on my monitor to switch between DisplayPort 1.1 and 1.2, and I've had some minor oddities here and there. So I change the value and wondered if anything good or bad would happen. Like my screen will just randomly re-sync again while using it. Happens maybe 1 time in a day, and at most a couple times in a week. We have lots of RF interference, and I can't lay out the computer cables how I'd like (the power runs parallel, but as far away as I can, to the data cables including the monitor's).

The only way I've been able to validate anything changed was in GPU-Z on the Advanced tab. It lists the Link Rate and Lanes, both current and max values. Those changed when I change the setting on the monitor. But that's about it.

Went from 2.7 Gbps to 5.4, and using all 4 possible lanes to using 2 of the 4 possible. All logical except I'm used to things, like PCIe generation, picking the max possible speeds "just in case" I assume. Though with monitors maybe that doesn't apply?

I'm running at the monitor's max/native mode of 1440p 75Hz. It offers a DP daisychain feature I can't disable, but can't use either as it's somehow limited to below 1440p for any additional screens. The fact it worked on half the bandwidth makes me question why the limit happens all the more. Acer BE270U on an NVIDIA 1080 ti if it matters. People online say it supports FreeSync, and NVIDIA's software agrees it might. This display isn't certified to work with GSYNC by NVIDIA, but I've played around with enabling that stuff (including in Windows for Variable Refresh Rate support).

Bonus points if anyone can tell me how to query the reason behind those resync events. Haven't found anything in my event log about it, though I'm not sure how to search for it. The LED just dims to amber like I just turned on the screen or changed resolutions, then comes back like nothing happened. All the while my PC continues, like playing the movie I'd already been watching. HDCP mentions a repeater that some programs might not allow, but as I said...I can't disable it. And I'm 99% sure I played Blurays with PowerDVD player a long time ago, which would be pretty stringent on HDCP functionality.
 
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