机器：Dell 7420 Intel+NVIDIA GT640M 双显卡
根据吧主13年的帖子，已经安装好了bumblebee、bumblebee-nvidia和bbswitch-dkms。
运行 optirun --help 会出现帮助信息，运行 optirun nvidia-settings -c :8 之前会显示连接不上独立显卡，BUSID "1:0:0" 什么的。
在网上找了一个xorg.conf.nvidia并覆盖修改后，就显示配置文件不正确。
1. 谁能把 xorg.conf.nvidia 文件里面的东西发给我一份么
2. 或者怎么 重置xorg.conf.nvidia 文件
邮箱 [email protected]，万分感谢。。已经折腾2天了。。

bumblebee在debian官方页面的说明中提到：
Common issues
- If optirun returns the following error: [ERROR]Cannot access secondary GPU - error: Could not load GPU driver
You must edit /etc/bumblebee/bumblebee.conf using your preferred editor as root, and change "KernelDriver=nvidia" to "KernelDriver=nvidia-current", then restart the bumblebee daemon, i.e.
sudo service bumblebeed restart
(Refer to Debian Bug 717687 for a brief explanation.)
- If optirun returns the following error: [ERROR]Cannot access secondary GPU - error: [XORG] (EE) No devices detected
You may have to set the BusID manually, in /etc/bumblebee/xorg.conf.nvidia. To get the BusID, run
lsp
ci | egrep 'VGA|3D' in a terminal. Refer to the comments in that file for further instructions.
- If optirun returns the following error (756522]]): [ERROR]Cannot access secondary GPU - error: [XORG] (EE) /dev/dri/card0: failed to set DRM interface version 1.4: Permission denied
You have to append the following section to /etc/bumblebee/xorg.conf.nvidia:
Section "Screen"
Identifier "Default Screen"
Device "DiscreteNvidia"
EndSection
- If optirun errors out and dmesg reports that your GPU has "fallen off the bus" on Linux >= 3.10, either stick with an older kernel version (<= 3.9), or add rcutree.rcu_idle_gp_delay=1 to your grub command line (in /etc/default/grub, then run update-grub and reboot) as a workaround.

你的是optimus的么？optimus的不需要单独配置xorg的