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In this case, the laptop you have comes with dedicated graphics (Intel and NVIDIA), from Intel's side, for max supported resolutions you can check the following:
Re: Intel HD 4000 HDMI 2560x1440 resolution???
To see the post in context you can check the following thread:
Intel HD 4000 HDMI 2560x1440 resolution???
You can also check the following article for further information:
Frequently Asked Questions about Display Resolutions.
At this point, the best recommendation is to contact the system manufacturer as The resolutions available on each video port are limited by them.
Hope this information helps.
Thank you so much !I have found the problem i can modify the resolution but cant apply.if we select "CVT-RB" as Timing Standard, 2560x1440 @ 55 Hz is possible,3440*1440 too(54Hz) .But, it did not appear in the Windows dialog until you rebooted the computer.Everything is clear now :b THKS