So I own an RIoT Board. (RIoTboard ) and I want to use it with this 7" HDMI LCD I have (7 inch HDMI TFT Capacitive Touch Screen 1024x600 SKU:408999 - raspberry pi wiki )
When I am connecting the LCD Display to a computer, and Beagle Bone Black it worked fine. BUT, when I tried with my RPi 2 and RIoT Board, The display started giving some random lines and fading lines and wired stuff.
So after doing through the above mentioned link I found out that on adding the proper mode details in config.text I was properly able to run the lcd display with my RPi 2 Board. 
Unfortunately the same cannot be said about RIoT Board.
After 3 days search on Internet , I came across the bootargs command which fixed the display issue with my HDMI Monitor for once but after rebooting it went to the same.
So, I have no luck with the Monitor. Could someone guide me about how to go about changing the HDMI MODE settings for the OS so that I could use the above mentioned settings with RIoT Board.
Regards,
GS Gill
P.S.-> I have tried Ubuntu 12.04, Android as well as Yacto and the problem persists with all of them. I would like to get some help regarding Ubuntu as that is the Dist I would be using in future.