I can confirm this issue. The problem happens with the nvidia drivers 302.
Seems that this new release of the proprietary nvidia drivers (302) brought some changes related to xrandr that broke disper:
http://www.phoronix.com/scan.php?page=news_item&px=MTEyMDk
This bug was also reported on Debian: http://bugs.debian.org/682600
I can confirm this issue. The problem happens with the nvidia drivers 302.
Seems that this new release of the proprietary nvidia drivers (302) brought some changes related to xrandr that broke disper:
http:// www.phoronix. com/scan. php?page= news_item& px=MTEyMDk
This bug was also reported on Debian: http:// bugs.debian. org/682600