安装bumblebee后XIO报错：fatal IO error11……

[xuxstar]

电脑配置：
系统：Ubuntu13.10
显卡；独显： NVIDIA GeForce GT 640M
集显：Intel® Core™ i7-3632QM CPU @ 2.20GHz 上搭载的
bumblebee版本：bumblebeed (Bumblebee) 3.2.1

问题：
当
输入 glxgears 时：
Running synchronized to the vertical refresh. The framerate should be
approximately the same as the monitor refresh rate.
305 frames in 5.0 seconds = 60.961 FPS
302 frames in 5.0 seconds = 60.369 FPS
300 frames in 5.0 seconds = 59.986 FPS
302 frames in 5.0 seconds = 60.377 FPS
XIO: fatal IO error 11 (Resource temporarily unavailable) on X server ":0"
after 900 requests (900 known processed) with 0 events remaining.
在glxgears开启的同时开启另一个终端，输入 lspci |grep VGA：
00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor Graphics Controller (rev 09)
01:00.0 VGA compatible controller: NVIDIA Corporation GK107M [GeForce GT 640M] (rev ff)


但！！
输入optirun glxgears时：
306 frames in 5.0 seconds = 61.173 FPS
300 frames in 5.0 seconds = 59.977 FPS
300 frames in 5.0 seconds = 59.973 FPS
300 frames in 5.0 seconds = 59.977 FPS
300 frames in 5.0 seconds = 59.978 FPS
XIO: fatal IO error 11 (Resource temporarily unavailable) on X server ":0"
after 29 requests (29 known processed) with 0 events remaining.
primus: warning: dropping a frame to avoid deadlock
primus: warning: timeout waiting for display worker

在glxgears开启的同时开启另一个终端，输入 lspci |grep VGA：
00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor Graphics Controller (rev 09)
01:00.0 VGA compatible controller:NVIDIA Corporation GK107M [GeForce GT 640M] (rev a1)

不知该如何解决……
另外，对不起，因之前问题描述不清楚而占用大家的宝贵时间，请原谅……

[xuxstar]

错了……是
sudo rm /etc/X11/xorg.conf
rm: 无法删除"/etc/X11/xorg.conf": 没有那个文件或目录