Hi Liu, if your system is Optimus you need install bumblebee and configure it, I had same problem recently. Steps: kill lightdm install nvidia-driver install nvidia-xconf run nvidia-xconf reboot install bumblebee configure bumblebee restart service of bumblebee
I also archieve this steps using nvidia PPA in debian with codename trusty, I hope it helps you. 2015-09-28 1:12 GMT-04:00 Liu Gengdai <liugeng...@gmail.com>: > Hi > > I'm a debian newbie. I installed latest Debian with xfce on my laptop. I > used official DVD-ROM. My graphics card is NV Geforce GT 640M LE. I > installed 360.65 driver for my graphics card following the instructions on > wiki: > https://wiki.debian.org/NvidiaGraphicsDrivers#Debian_8_.22Jessie.22 > > The installation process went well. But once I created Xorg server > configuration file and restarted, I cannot enter xfce. It says there are > X-window server errors. If I delete the conf file, I can enter. But nvidia > configuration setting reports the driver is not working. > > Can anybody help me? Thank you very much. > > Best regards, > Gengdai > >