DisplayPort settings of the LCD display may limit resolution
This article provides the information on "The DisplayPort settings of the LCD display may limit the resolution options".
DisplayPort connected display doesn't show Optimal Resolution.
Users of 4k x 2k Ultra HD displays may report that the maximum resolution offered for the display is less than 3840 x 2160. Users may report the highest resolution obtainable is WQXGA 2560 x 1600 pixels.
The display is correctly connected using a DisplayPort cable without adapters.
Configure DisplayPort 1.2 in the display configuration.
To ensure display resolution higher than 2560 x 1600 pixels, configure DisplayPort input to DisplayPort 1.2 in the On-Screen Display (OSD) settings.
Quick Tips content is self-published by the Dell Support Professionals who resolve issues daily. In order to achieve a speedy publication, Quick Tips may represent only partial solutions or work-arounds that are still in development or pending further proof of successfully resolving an issue. As such Quick Tips have not been reviewed, validated or approved by Dell and should be used with appropriate caution. Dell shall not be liable for any loss, including but not limited to loss of data, loss of profit or loss of revenue, which customers may incur by following any procedure or advice set out in the Quick Tips.