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[ubuntuguest <ubuntuguest@xxxxxxxxxxxxxx>]

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?

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Packages, which is subscribed to xserver-xorg-video-ati in Ubuntu.
https://bugs.launchpad.net/bugs/1364078

Title:
  Cannot set screen resolution above 1400x1050

Status in “xserver-xorg-video-ati” package in Ubuntu:
  Expired

Bug description:
  Since installing Ubuntu 14.04, I have not been able to adjust the display resolution to 1920x1080.
  My current Ubntu version is Ubuntu 14.04.1 LTS.
  My video card is an AMD/ATI RV710, which displayed at high resolution with Ubuntu 12.04.
  The Ubuntu 14.04 open-source driver showed options between 640x400 and 1280x1024. I tried the proprietary driver, which set the resolution at 1400x1050 with no other options. I tried to remove the proprietary driver, but rebooting has me stuck at 1400x1050.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: xfce4-settings 4.11.2-1ubuntu2
  ProcVersionSignature: Ubuntu 3.13.0-35.62-lowlatency 3.13.11.6
  Uname: Linux 3.13.0-35-lowlatency x86_64
  ApportVersion: 2.14.1-0ubuntu3.3
  Architecture: amd64
  CurrentDesktop: XFCE
  Date: Mon Sep  1 11:49:11 2014
  ExecutablePath: /usr/bin/xfce4-settings-manager
  InstallationDate: Installed on 2014-08-15 (17 days ago)
  InstallationMedia: Ubuntu-Studio 12.04.5 "Precise Pangolin" - Release amd64 (20140807.1)
  ProcEnviron:
   LANGUAGE=en_US:en
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: xfce4-settings
  UpgradeStatus: Upgraded to trusty on 2014-08-16 (16 days ago)

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