Qosmio X70-B-10T - VGA output supports only 1920x1080

Question

I'm trying to set two HP Compaq LA2405wg monitors on my Qosmio X70-B-10T, one via HDMI and the other via VGA.
The monitors run @ 1920x1200.
Unfortunately, whilst the HDMI screen comes out okay, the screen connected via VGA only goes up to 1920x1080.
Is there a way to fix this?
My old Satellite Pro L870 managed both screens like this just fine.

Answer 1

The notebook supports two GPUs.
Internal Intel HD Graphics 4600
External AMD Radeon R9 M265X
What GPU is in use and what GPU controls the both monitors?
If you use the ATI GPU you could check the CCC (catalyst) settings.
Catalyst Control Center → MonitorProperties → Attributes
and here change MonitorAttributes to:
uncheck the option “Use Extended Display Identification Data (EDID) or driver defaults”
Then you could set Maximum resolution to: 1920x1200 at 60 Hz
After that restart Catalyst, set 1920x1200 then it should work.
If it will not work change also
CCC → DisplayOptions → from “Detect…” to “Use manual detection only" ( i must click the Detect Displays button) and on the same page
displayManagementOptions
For diplays of limites resolution capabilities → List all possible modes ( including panning modes)