Same problem for me:

I have ubuntu 13.04 and kde 4.11.
I removed my fglrx drivers, so I'm using open mesa drivers.
After reboot my maximum display resolution was 1280x1024, but my real maximum 
(that I correctly had with fglrx drivers) is 1920x1080.

I tried to do something from this wiki:
https://wiki.ubuntu.com/X/Config/Resolution to section "Setting
resolution changes in xorg.conf -- resolution lower than expected" but
it didn't solve my problem, infact I tried to edit xorg.conf with the
lines in the attached file but after reboot it says that my xorg.conf is
not correctly configured and I had to remove xorg.conf and use the old
one I had backed up before.

Besides I have "plasma-desktop" crash at startup (only without fglrx
drivers, that is with open drivers).

I'll give you some information:

Crash log in "Developer Information" section of KDE Crash Assistant:
http://pastebin.com/raw.php?i=8stmVCky

xorg.conf:
http://pastebin.com/raw.php?i=D6MPUEZv

Xorg.0.log:
http://pastebin.com/raw.php?i=dWDVe03t

** Attachment added: "xorg.conf"
   
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-ati/+bug/1174042/+attachment/3773428/+files/xorg.conf

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https://bugs.launchpad.net/bugs/1174042

Title:
  System crashes with open-source radeon driver

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