All boots with bumblebee ends with kernel panic

[dm4g3]

After installing Bbee all works fine and switch good.
But after reboot all boots end with KP.
What's wrong with bumblebee? What additional information I must send to developers?

Hardware: lenovo v570a2, i3, GF525, Kingston ValueRAM 8GB, Kingston SSD 60GB.
Software: ubuntu 12.04 LTS 64bit, KDE.

After uninstall bumblebee via aptitude purge, all works fine. So it's bb.

[Lekensteyn]

You could try delaying the start of Bumblebee. bbswitch disabled the card during startup, but due to a kernel bug in Precise, you get a Kernel Panic.

[dm4g3]

Any advice for complete it? I'm not so good with boot delaying.

[Lekensteyn]

This is an error that occurs on laptops that have an HDMI port wired to the nvidia card which has an audio output. It occurs on the 3.2 kernel shipped with Ubuntu. I believe that this panic is fixed in later versions of the kernel and as a workaround you can delay the starting process of bumblebeed.

Try the following upstart script in place of /etc/init/bumblebeed.conf:

# Upstart job for Bumblebee daemon

description "Bumblebee supporting nVidia Optimus cards"
author      "Lekensteyn <lekensteyn@gmail.com>"

# XXX: do we need to stop before / after a graphical DE like kdm?
start on    (runlevel [2345])
stop on     (runlevel [016])

# restart in case it crashed for some reason
respawn

script
    # delay startup, increase if you still get a panic
    sleep 2
    # don't use --daemon as Upstart gets confused by that.
    exec /usr/sbin/bumblebeed --use-syslog
end script

[Lekensteyn]

The "fixed" upstart script above has been reported to work.

[dm4g3]

So, completely put this conf-script into head of /etc/bumblebee/bumblebee.conf and reboot the system?
bumblebeed.conf or bumblebee.conf?

[Lekensteyn]

@d-mage It is an Upstart script. Put it in /etc/init/bumblebeed.conf

[dm4g3]

Workaround works properly. No kernel panics.