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[Andreas Raster <1197902@xxxxxxxxxxxxxxxxxx>]

I have the same problem and just tested with the latest mainline kernel
[0]. The problem wasn't fixed.

I also tried different propietary driver versions (I am using fglrx) and
the open source radeon driver, both of which showed the same wrong
behaviour. I think I should be able to fix the problem by just forcing a
mode with a manually written xorg.conf and will try that later.

[0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.11-rc7-saucy/

** Tags added: kernel-bug-exists-upstream

** Changed in: linux (Ubuntu)
       Status: Incomplete => Confirmed

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https://bugs.launchpad.net/bugs/1197902

Title:
  Display corruption on 29" 2560x1080 monitor

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  I have a 29" monitor that supports a native resolution of 2560x1080.
  Using the nouveau driver with kernel mode setting correctly set the
  resolution of the display, as indicated in the gnome-control-center ->
  display configuration utility, but the display appears to running at a
  much lower apparent resolution.  Text is almost unreadable, everything
  appears incredibly "fuzzy".  I attempted to use the proprietary nvidia
  drivers, and after using the nvidia-xconfig utility to generate a
  xorg.conf file and restarting the machine it is indeed using the
  proprietary driver and hardware acceleration is working, but the fuzzy
  condition persists.

  I am using Ubuntu 13.04, I have updated all the packages.

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