Ubuntu 12.04下解决nvidia-current升级后Module 'nvidia-current' is not found造成Bumblebee无法工作的问题。
环境
系统：Ubuntu 12.04
内核：3.2.0-29-generic #46-Ubuntu x86_64 x86_64 x86_64 GNU/Linux
前天升级了nvidia（ppa源里的官方驱动），今天突然发现bumblebee出问题了。表现是执行 optirun会出现下面的提示
[ERROR]The Bumblebee daemon has not been started yet or the socket path /var/run/bumblebee.socket was incorrect.
[ERROR]Could not connect to bumblebee daemon - is it running?
更奇怪的Ubuntu只找到了集成的intel显卡，nvidia 独显没有找到
@linux:~$ sudo lspci | grep -i vga
[sudo] password for jim:
00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09)
估计可能和显卡驱动升级有关
于是我重装了nvidia-current nvidia-settings nvidia-settings-updates三个包
重启电脑后再执行lspci
@linux:~$ sudo lspci | grep -i vga
[sudo] password for jim:
00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09)
01:00.0 VGA compatible controller: NVIDIA Corporation GF108 [GeForce GT 540M] (rev 0a)
@linux:~$
好一些了，起码nvidia显卡出来了。
不过独显的状态不对，应该是rev ff(停用)，而不是是rev 0a(启用)，这说明bumblebee没有工作。
查看了一下和Bumblebee有关的系统日志
@linux:~$ cat /var/log/syslog | grep -i bumblebee
....
Aug 18 23:42:27 jim-laptop bumblebeed[16703]: Module 'nvidia-current' is not found.
Aug 18 23:42:27 jim-laptop kernel: [ 3649.159504] init: bumblebeed main process (16703) terminated with status 1
Aug 18 23:42:27 jim-laptop kernel: [ 3649.159528] init: bumblebeed main process ended, respawning
....
找到关键问题了，因为nvidia-current模块没有找到
进入到 /lib/modules/3.2.0-29-generic目录执行find'命令
@linux:/lib/modules/3.2.0-29-generic$ sudo find ./ -name "nvidia*"
./kernel/drivers/net/ethernet/nvidia
./kernel/drivers/video/nvidia
./kernel/drivers/video/nvidia/nvidiafb.ko
./updates/dkms/nvidia.ko
./updates/dkms/nvidia_current_updates.ko
@linux:/lib/modules/3.2.0-29-generic$
有一个nvidia.ko和一个nvidia_current_updates.ko，就是没有nvidia-current.ko，难道是最新版的nvidia-current驱动修改了模块名？？
我把/etc/bumblebee/bumblebee.conf修改了一下，把其中[driver-nvidia]部分的
KernelDriver=nvidia-current
改成
KernelDriver=nvidia
改完重启，问题就解决了。