Monitor res

[Grizzly]

Hi

I'm having areal problem with a new monitor on ElementryOS (based on Nobal)

I cant get it to see the native resolution (1920x1080 at 75Hz) after a huge search 
and hours of testing

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash nomodeset video=1920x1080 at 75"

does nothing

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash video=1920x1080 at 75"

gives a blank screen (total black) even the monitors OSD fails after the 
initial good result

then 
$ cvt 1920 1080 75
# 1920x1080 74.91 Hz (CVT 2.07M9) hsync: 84.64 kHz; pclk: 220.75 MHz
Modeline "1920x1080_75.00"  220.75  1920 2064 2264 2608  1080 1083 1088 1130 
-hsync +vsync
$ sudo xrandr --newmode "1920x1080_75.00"  220.75  1920 2064 2264 2608  1080 
1083 1088 1130 -hsync +vsync
$ sudo xrandr --addmode None-1 "1920x1080_75.00"

if the "new" display is chosen it gives a blank/black screen with a blinking 
mouse pointer

a terminal can be opened, it then reports

Can't open display

Various searchs suggest putting the above commands in a monitors bash file but 
I hit the same problem "after" choosing the new resolution

any ideas, or I'm I stuck with 1280x1024 at 60hz (on that OS) with most controls 
off the screen edge

Nobal & Questing (along with Win7) all work fine at 1920x1080 at 75hz on thevery 
same box