x34 oc mode causing huge gamma shift not correctable by calibration

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fluidz
fluidz Member Posts: 15 Troubleshooter
edited March 2023 in 2017 Archives

Hi Acer and everyone,

 

I've an issue with the oc mode on my Acer x34a monitor.

 

When I open the x34s menu and adjust the switch that turns oc mode on, setting to 75hz - 100hz (makes no difference) and leaving the panel at 60hz in windows, there's quite a drastic difference to gamma/colors on screen compared to leaving overclock mode turned off.

 

I've been told that overclocking the monitor may lead to instabilities.  This I understand if applying a refresh rate above 60hz may affect the image quality.   However, with my x34a, if the oc mode is turned on, but I leave the monitor at 60hz, there's no actual overclocking happening, yet I see the following differences :

 

With oc mode turned off black levels look like this (60hz in windows 10) :

 

1.png

 

With oc mode turned on black levels look like this (60hz in windows 10) :

 

2.jpg

 

As you can see, with oc turned on, the black levels are grey.  With oc turned off, the black levels look correct.

 

I can't use Oc mode on my monitor as the black levels are much much brighter, and even after using an i1 Display Pro to calibrate, the black levels are no where near as good as when oc mode is off. 

 

Is this a software/firmware issue?

 

Does everybody else see these differences just by turning oc mode on?