regenerate xorg.conf with current settings

Many people have talked about this issue but I've not found a satisfactory answer. I'm on a debian jessie. Currently I have tried nvidia-driver as the driver but it caused the system to crash; so I have purged all the nvidia packages. But the problem is that /etc/X11/xorg.conf has been replaced with NVidia settings and the backup xorg.conf.backup has been removed. The related configuration set by NVidia is: Section "Device" Identifier "Device0" Driver "nvidia" VendorName "NVIDIA Corporation" EndSection I once tried changing nvidia to intel(also NVidia -> Intel) but the resolution is much lower(my laptop has a Intel Corporation Haswell-ULT Integrated Graphics Controller as listed by lspci). So I might need to use nouveau as the driver; however simply changing nvidia to nouveau doesn't work. It seems that the recent X system can be booted without xorg.conf(by rm /etc/X11/xorg.conf) but slower. So I still prefer the xorg.conf with my current settings. The version of Xorg: X.Org X Server 1.16.0 Release Date: 2014-07-16 X Protocol Version 11, Revision 0 Build Operating System: Linux 3.14-1-amd64 x86_64 Debian Current Operating System: Linux debian 3.14-1-amd64 #1 SMP Debian 3.14.9-1 (2014-06-30) x86_64 Kernel command line: BOOT_IMAGE=/boot/vmlinuz-3.14-1-amd64 root=UUID=e9341749-9dee-4cc9-878e-3b59ed1906b2 ro quiet Build Date: 17 July 2014 10:22:36PM xorg-server 2:1.16.0-1 (http://www.debian.org/support) Current version of pixman: 0.32.4 Before reporting problems, check http://wiki.x.org to make sure that you have the latest version. So are there any ways to re-generate the configuration file?