Screen resolution is correct (full-hd 1920x1080).
Backlight control works after manually creation of /etc/X11/xorg.conf by 
nvidia-xconfig and adding
{
Option         "RegistryDwords" "EnableBrightnessControl=1"
}
to the Device section.

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to nvidia-graphics-drivers-304 in Ubuntu.
https://bugs.launchpad.net/bugs/1242612

Title:
  Unable to change Backlight level while using Nvidia driver

Status in “nvidia-graphics-drivers-304” package in Ubuntu:
  New

Bug description:
  I have Sony VAIO F13Z1R laptop with discrete Nvidia GT425M:
  01:00.0 VGA compatible controller: NVIDIA Corporation GF108M [GeForce GT 
425M] (rev a1)

  On fresh Ubuntu 13.10 (or 13.10 GNOME) I'm unable to change backlight level 
while using Nvidia 304 driver (304.88-0ubuntu8).
  I see backlight desktop indicator, it reacts on fn+backlight keys, but level 
is not changed.

  Nouveau driver controls my backlight level normally.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.10
  Package: nvidia-current 304.88-0ubuntu8
  ProcVersionSignature: Ubuntu 3.11.0-12.19-generic 3.11.3
  Uname: Linux 3.11.0-12-generic i686
  NonfreeKernelModules: nvidia
  ApportVersion: 2.12.5-0ubuntu2
  Architecture: i386
  Date: Mon Oct 21 14:01:54 2013
  InstallationDate: Installed on 2013-10-20 (0 days ago)
  InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release i386 (20131016.1)
  MarkForUpload: True
  SourcePackage: nvidia-graphics-drivers-304
  UpgradeStatus: No upgrade log present (probably fresh install)

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https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-drivers-304/+bug/1242612/+subscriptions

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