Big Problem with Directx 11 and Games scaling when lower than native resolution

Question

Hi Guys,
MY system is Windows 7 Home Premium (Korean version), and I have dual GPUs, Nvidia Geforce GT 630m for gaming, and Intel HD Graphics 4000 for all other display matters.  My native resolution is 1920 x 1080.
This problem wasn't there couple of years back, but from 2~3 years ago, when I play recent games that require/favour directx 11 (such as Assassin's Creed IV Black Flag, Batman: Arkham Origins), it seems when I use lower than native resolution (such as 1280
x 720) and select fullscreen, giant ugly black borders always appear around the game, and the game does not fill the whole screen.  
I thought this was something which could be fixed in my GPU's control panel, but there was no scale fullscreen option under Nvidia's control panel.  So I went into Intel HD Graphics control panel, but there was no Scale fullscreen option there either (under
native resolution.  With lower resolution there was).
Anyway, after months and months of searching, I finally found an Intel forum which was discussing the same situation:
https://communities.intel.com/thread/44539
While going through the forum, I found out from other users that problem is not with GPU's drivers, but with Directx 11.  
To test this theory, I put Batman: Arkham Origins in Force Directx 9 mode, and changed the game resolution to 1280x720.  And the game showed no black borders, it scaled up perfectly to fullscreen under Directx 9 (so no problem whatsoever under directx
9).  I changed the setting to Directx 11, and the ugly black borders appeared again.
Could someone please help with this?  I know I can change my screen's resolution every time I play the game, but it's a real nuisance to do that.  And more games are utilising Directx 11 or higher, and I don't think there are many games where I can
force Directx 9 mode like I did for Arkham Origins.
Or if someone connected could contact the people working on Directx 11 and ask about this issue (and get them to contact me through my email below), that would be much appreciated.
my email:
[email protected]
p.s. : all my GPU drivers are currently up to date, and the black borders issue is still there

Answer 1

Hello MeipoXu
While yes, at first people on the Intel forum thought it was the display driver problem (hence the question was originally posted on the Intel forum).  But if you look closely through the pages especially Pages 2 onwards, there are some very astute
comments by some posters:
Update to black borders problem: The problem is DirectX11. Fx. Company of Heroes has a setting "Shader Quality" that when set to ULTRA it will run directX11 and when set below ULTRA it will run directX9. So the intel graphics driver is not
responsible! It is Microsofts DirectX11 that does it - maybe only to computers with both Intel HD and a second graphics card for video games
Different workarounds to the black border problem:
Change resolution before running fullscreen
Use directX9 instead of directX11
Fx. in CoH2 there is a setting fx. 50% of resolution, so even in native resolution the graphics is only half and thus faster
Try window mode without borders
and here's also another:
I can confirm that this problem still seems to exist, and that it definitely seems to be related to DirectX 11.
In a variety of games, turning DirectX11 off (either in-game or using ini files in some games that don't present you with the choice) fixes the issue. But this is obviously not ideal.
I have a laptop with a native resolution of 1920x1080, but tend to run games at 1280x720 because it provides much better performance on my HD 4400 graphics chip. This bug and the memory leak issue on Windows 8.1 are extremely annoying.
Like the first poster, my PC has intel HD GPU, and a second graphics card for games (Nvidia).
And all the members have mentioned that they updated the intel graphics driver, but it does not fix it - so it doesn't seem like a graphics driver problem (and more to do with Directx 11).
And they are right.  With Batman Arkham Origins, if I set the resolution to 1366 x 768 and apply fullscreen, under Directx 11, ugly black borders appears.  Luckily Arkham Origins has "Force Directx 9 mode" which I use, but a lot of games
don't have this mode (such as ACIV Black Flag, Watch Dogs, Sleeping Dogs etc) - you either play in ugly black borders, or can't play the game at all.
And all my Graphics Drivers are currently up-to-date, and issue still exists, so I don't think it's the driver problem.
I have already tried that registry method you just mentioned.  It didn't work.
As for Directx 12, well I just hope it works better than Directx 11 (with its ugly black borders in games) does, and works well like Directx9 (with no problem in scaling).