I have tha same (1440, gamma, fglrx removed) with Radeon HD 4850, but only on 
upgraded ubuntu from 12.04 to 14.04 (both LTS) .
With "14.04.1 LTS desktop live" I have correct resolution:
root@ubuntu:~# xrandr -q
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 8192 x 8192
HDMI-0 disconnected (normal left inverted right x axis y axis)
VGA-0 connected primary 1920x1080+0+0 (normal left inverted right x axis y 
axis) 477mm x 268mm
   1920x1080      60.0*+
   1680x1050      60.0  
   1280x1024      60.0  
   1440x900       59.9  
   1280x960       60.0  
   1280x800       59.8  
   1024x768       60.0  
   800x600        60.3     56.2  
   640x480        60.0  
DVI-0 disconnected (normal left inverted right x axis y axis)

#lspci
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] RV770 
[Radeon HD 4850]

On the upgraded version I have to use -q12 and -s  to see 1920x1080, but can't 
add it  -  gamma "missing".
As there is no xorg.conf, it is hard to move settings ...
It looks, as always, the best way to upgrade ubuntu is to reinstall ubuntu. I 
think to install all packages from "live" distribution missing in the installed 
version, as it is all autodiscovery, but I feel I will have to reinstall it.
But if installed ubuntu has different autodiscovery settings compared to the 
live version, maybe someone knows, how to change it?

-- 
You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to xserver-xorg-video-ati in Ubuntu.
https://bugs.launchpad.net/bugs/1364078

Title:
  Cannot set screen resolution above 1400x1050

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-ati/+bug/1364078/+subscriptions

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