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In order for all supported resolutions to be available, the monitor drivers need to be loaded. Please bear in mind that your computer manufacturer may have altered video BIOS on your computer, this is why you are not able to create custom resolutions.
Test by running the latest graphics drivers for your controller here: File name: win64_15367.exe
Check this link for additional information: Graphics Drivers — Display Resolutions Frequently Asked Questions (FAQ)
I have a Acer W510 tablet. It has an Atom Z2760 processor with an integrated Graphics Media Accelerator. I just connected my brand new 29" HKC firstname.lastname@example.orgHz native resolution external monitor via HDMI/DVI cable and the highest resolution Win 8.1 and the Intel Graphics Media Control Panel will show is 1920x1080@60Hz. I've installed the monitor drivers, which Intel Graphics Media Control Panel confirms through EDID that it does support email@example.comHz mode. I've checked the specs of the Intel Atom Z2760. The max resolution is 1080p, although it does not state horizontal resolution. However, looking at the scan frequency information giving, the Atom Z2769 GMA should be able to support 2560x1080p resolution. I've looked everywhere for a solution including editing the .INF file through DTD utility, and trying to use Intel's custommodeapp.exe (doesn't run), and many other methods, but nothing works. I use the display for work, not for gaming. But I do need to have a circle look like a circle. Can you please inquire with engineering for an update of the drivers and related software for the Z2760 so it's possible to set higher (custom) resolutions even with reduce color depth. Even at 16 or 24-bits is usable for many people.
We have plenty of positive reports from Tablet owners in regards to screen resolutions; however, the problem might be due to driver compatibility or driver availability from the Tablet manufacturer.
Please bear in mind, the computer manufacturer can change the features, incorporate customizations, or make other changes to the graphics driver software or software packaging. Intel recommends contacting Acer | Service & Support | Acer Official Site for information about this matter.
Custommodeapp isn't used anymore in latest drivers - functionality is built into the control panel itself. That said, it seems unlikely that will help for reasons below..
Intel display hardware doesn't support dual link DVI, only single link; it is not possible to drive 25x16 over single link DVI (Not enough bandwidth), even if you use DVI-D cable.
Intel display hardware supports HDMI 1.4a which should let you drive high res displays via appropriate cable (25x16@60 should be ok, or even 3840x2160@30, 4096x2160@24).
However the Dell 3000 WFP is a pretty old monitor - It seems likely that the monitor's HDMI receiver is an older rev of the HDMI spec (e.g. 1.2?) and thus doesn't actually support 25x16 via HDMI.
Are you stuck? well, maybe/maybe not. You could buy dongle to drive the DVI port on the monitor.
Option 1: Get HDMI->DVI dual link Active adapter
Option 2: Get miniDP -> DVI dual link Active adapter OR if you can't find that, mini DP -> DP adapter (could be passive) + DP->DVI dual link ACTIVE adapter.
The ACTIVE part is critical here - with passive dongles, Intel sees the remote display as DVI and uses single link semantics. With active adapter, Intel gpu sees the connection as DP/HDMI, not as DVI single link