edit : solution for this problem was mentioned on the first page . i look to bios but i couldnt find anything useful
i am using gt 540m with optimus technology. i installed bumblee project a month ago but just before installing nvidia driver today , i've deleted it from package manager. recovering my system is more important for me now than install nvidia driver
--edit2---
solved by myself
If you are installing the Nouveau drivers after uninstalling the Nvidia ones, be sure to delete the /etc/X11/xorg.conf file that the Nvidia driver created (or undo the changes), or else X will fail to properly load the Nouveau driver.
Install the DDX driver with the xf86-video-nouveau package.
Also make sure you have Xorg properly installed.
If you want hardware-accelerated 3D support (to run GNOME Shell or KWin's effects, for instance), install the DRI driver with the nouveau-dri package. For Arch x86_64, install lib32-nouveau-dri from the Multilib repository, as well.
this worked for me finally i get my full screen back ! and i decide to use primus for bumblebee








