Comment 676 for bug 752542

Here's a report generated on a Lenovo Thinkpad T420. Bumblebee installed fine on freshly-installed straight Debian Wheezy. I had lots of problems following the official howto at https://wiki.debian.org/Bumblebee. I posted a clarified howto at http://www.thinkwiki.org/wiki/Installing_Debian_on_a_ThinkPad_T420. Lenovo's official spec page on this laptop is http://support.lenovo.com/en_US/downloads/detail.page?DocID=PD015734. A more Linux-friendly rundown on it is at http://www.thinkwiki.org/wiki/Category:T420